Thermo Scientific AQUAfast AQ3700 User manual

Thermo Scientific Orion
AQUAfast AQ3700 Colorimetry Meter
User Guide

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This publication supersedes all previous publications on this subject.

1
Thermo Scientific Orion AQUAfast AQ3700 Colorimeter User Guide
Safety Precautions
CAUTION
Reagents are formulated exclusively for chemical analysis and must not be used for
any other purpose. Reagents must not get into the hands of children. Some of the
reagents contain substances which are not entirely harmless environmentally. Be
aware of the ingredients and take proper care when disposing of the test solution.
CAUTION
Please read this instruction manual before unpacking, setting up or using the meter.
Please read the method description completely before performing the test. Be aware
of the risks of using the required reagents by reading the MSDS (Material Safety
Data Sheets). Failure could result in serious injury to the operator or damage to the
instrument. MSDS files can be downloaded at www.thermoscientific.com/water by
entering the catalog number into the search box on the website.
CAUTION
The accuracy of the instrument is only valid if the instrument is used in an
environment with controlled electromagnetic disturbances according to DIN 61326.
Wireless devices, e.g. wireless phones, must not be used near the instrument.

Table of Contents
Part 1 Methods......................................................................................................7
1.1 Table of Methods.......................................................................................................8
Acid demand to pH 4.3....................................................................................................12
Alkalinity-total (Alkalinity-m, m-Value)..............................................................................14
Alkalinity-p (p-Value)........................................................................................................16
Aluminium, tablets...........................................................................................................18
Aluminium, powder packs ...............................................................................................20
Ammonia, tablets ............................................................................................................22
Ammonia, powder packs .................................................................................................24
Ammonia, low range (LR).................................................................................................26
Ammonia, high range (HR)...............................................................................................28
Boron ..............................................................................................................................30
Bromine...........................................................................................................................32
Chloramine (mono) and Free Ammonia............................................................................34
Chloride...........................................................................................................................38
Chlorine...........................................................................................................................40
Chlorine, tablets
differentiated determination (free, combined, total) .....................................................42
free Chlorine................................................................................................................44
total Chlorine...............................................................................................................45
Chlorine, liquid reagent
differentiated determination (free, combined, total) .....................................................46
free Chlorine................................................................................................................48
total Chlorine...............................................................................................................49
Chlorine, powder packs
differentiated determination (free, combined, total) .....................................................50
free Chlorine................................................................................................................52
total Chlorine...............................................................................................................53
Chlorine Dioxide ..............................................................................................................54
in presence of Chlorine ................................................................................................56
in absence of Chlorine .................................................................................................59
Chlorine HR (Kl) ...............................................................................................................60
COD,
low range (LR)..............................................................................................................62
middle range (MR) .......................................................................................................64
high range (HR)............................................................................................................66
Colour, True and Apparent (APHA)...................................................................................68
Copper, tablets ................................................................................................................70
differentiated determination (free, combined, total) .....................................................71
free Copper .................................................................................................................72
total Copper ................................................................................................................73

3
Thermo Scientific Orion AQUAfast AQ3700 Colorimeter User Guide
Copper, powder packs .....................................................................................................74
Cyanide ...........................................................................................................................76
Cyanuric Acid ..................................................................................................................78
DEHA, tablets ..................................................................................................................80
DEHA, powder packs .......................................................................................................82
Fluoride ...........................................................................................................................84
Hardness, Calcium, tablets...............................................................................................86
Hardness, Calcium, LR, tablets .........................................................................................88
Hardness, total.................................................................................................................90
Hardness, total HR ...........................................................................................................92
Hydrazine, powder reagent..............................................................................................94
Hydrazine, liquid reagent .................................................................................................96
Hydrazine, ampoule.........................................................................................................98
Hydrogen Peroxide.........................................................................................................100
Iodine ............................................................................................................................102
Iron................................................................................................................................104
Iron, tablets................................................................................................................106
Iron, powder packs ....................................................................................................108
Iron (TPTZ), powder packs ..........................................................................................110
Manganese, tablets........................................................................................................112
Manganese LR, powder packs........................................................................................114
Manganese HR, powder packs.......................................................................................116
Molybdate, tablets.........................................................................................................118
Molybdate HR, powder pack..........................................................................................120
Nitrate ...........................................................................................................................122
Nitrite, tablets................................................................................................................124
Nitrite LR, powder packs ................................................................................................126
Nitrogen, total LR tube test............................................................................................128
Nitrogen, total HR tube test ...........................................................................................130
Oxygen, active, tablets...................................................................................................132
Oxygen LR, dissolved......................................................................................................134
Ozone............................................................................................................................136
in presence of Chlorine ..............................................................................................138
in absence of Chlorine ...............................................................................................140
PHMB (Biguanide)..........................................................................................................142
Phosphate......................................................................................................................144
Phosphate, ortho LR, tablets.......................................................................................146
Phosphate, ortho HR, tablets......................................................................................148
Phosphate, ortho, powder packs................................................................................150
Phosphate, ortho, tube test........................................................................................152
Phosphate 1, ortho C.................................................................................................154

4Thermo Scientific Orion AQUAfast AQ3700 Colorimeter User Guide
Phosphate 2, ortho C, tablets.....................................................................................156
Phosphate, hydrolyzable, tube test.............................................................................158
Phosphate, total, tube test .........................................................................................160
Phosphonate..................................................................................................................162
pH-Value LR , tablets......................................................................................................166
pH-Value, tablets ...........................................................................................................168
pH-Value, liquid reagent ................................................................................................170
pH-Value HR, tablets......................................................................................................172
Potassium ......................................................................................................................174
Silica, tablets..................................................................................................................176
Silica LR, powder packs..................................................................................................178
Silica HR, powder packs .................................................................................................180
Sodium hypochlorite......................................................................................................182
Sulfate, tablets...............................................................................................................184
Sulfate, powder packs....................................................................................................186
Sulfide ...........................................................................................................................188
Sulfite............................................................................................................................190
Suspended Solids...........................................................................................................192
Turbidity ........................................................................................................................194
Urea ..............................................................................................................................196
Zinc ...............................................................................................................................198
1.2 Important notes .........................................................................................200
1.2.1 Correct use of reagents .................................................................................200
1.2.2 Cleaning vials and accessories for analysis .....................................................201
1.2.3 Guidelines for photometric measurements ....................................................201
1.2.4 Sample dilution techniques............................................................................203
1.2.5 Correcting for volume additions ....................................................................203
Part 2 Operating Manual ..........................................................................205
2.1 Operation....................................................................................................206
2.1.1 Set Up...........................................................................................................206
2.1.2 Saving data – Important notes.......................................................................206
2.1.3 Replacement of batteries...............................................................................206
2.1.4 Instrument (explosion drawing) .....................................................................207
2.2 Overview of function keys ........................................................................209
2.2.1 Overview.......................................................................................................209
2.2.2 Displaying time and date ...............................................................................210
2.2.3 User countdown............................................................................................210

5
Thermo Scientific Orion AQUAfast AQ3700 Colorimeter User Guide
2.3 Operation mode .........................................................................................211
2.3.1 Automatic switch off.....................................................................................211
2.3.2 Selecting a method .......................................................................................211
2.3.2.1 Method information......................................................................................211
2.3.2.2 Chemical species informationChemical species information ........................................................................212
2.3.3 Differentiation ...............................................................................................212
2.3.4 Performing Zero ............................................................................................212
2.3.5 Performing Test .............................................................................................213
2.3.6 Ensuring reaction periods (countdown)..........................................................213
2.3.7 Changing chemical species............................................................................214
2.3.8 Storing results ...............................................................................................214
2.3.9 Printing results ..............................................................................................215
2.3.10 Perform additional measurements .................................................................215
2.3.11 Selecting a new method................................................................................216
2.3.12 Measure absorbance .....................................................................................216
2.4 Meter settings <Mode Menu>. ................................................................217
2.4.2 Instrument basic settings 1 ............................................................................218
2.4.3 Printing of stored results................................................................................222
2.4.4 Recall / delete stored results...........................................................................228
2.4.5 User Calibration ............................................................................................233
2.4.6 Lab function..................................................................................................237
2.4.7 User operations .............................................................................................238
2.4.8 Special functions ...........................................................................................248
2.4.9 Instrument basic settings 2 ............................................................................250
2.4.10 Instrument special functions / Service ............................................................250
2.5 Data transfer...............................................................................................251
2.5.1 Data printing.................................................................................................251
2.5.2 Data transfer to a personal computer (PC) .....................................................251
2.5.3 Internet Updates ...........................................................................................251
Part 3 Enclosure..............................................................................................253
3.1 Unpacking.....................................................................................................254
3.2 Delivery contents...........................................................................................254
3.4 Technical data ...............................................................................................255
3.5 Abbreviations ................................................................................................256
3.6 Troubleshooting ............................................................................................257
3.6.1 Operating messages in the display / error display ...........................................257
3.6.2 General .........................................................................................................259
3.7 Declaration of CE-Conformity........................................................................260

6Thermo Scientific Orion AQUAfast AQ3700 Colorimeter User Guide

7
Thermo Scientific Orion AQUAfast AQ3700 Colorimeter User Guide
Part 1
Methods

8Thermo Scientific Orion AQUAfast AQ3700 Colorimeter User Guide
1.1 Methods
1.1Table of Methods
No. Analysis Reagent Range Displayed
as
Method
[nm]
Page
20 Acid demand to
pH 4.3 T
tablet 0.1-4 mmol/l Acid/Indicator1,2,5 610 12
30 Alkalinity, total T tablet 5-200 mg/l CaCO3Acid/Indicator1,2,5 610 14
35 Alkalinity-p T tablet 5-500 mg/l CaCO3Acid/Indicator1,2,5 560 16
40 Aluminium T tablet 0.01-0.3 mg/l Al Eriochrome
Cyanine R2
530 18
50 Aluminium PP PP + liquid 0.01-0.25 mg/l Al Eriochrome
Cyanine R2
530 20
60 Ammonia T tablet 0.02-1 mg/l N Indophenol blue
2,3
610 22
62 Ammonia PP PP 0.01-0.8 mg/l N Salicylate2660 24
65 Ammonia LR TT tube test 0.02-2.5 mg/l N Salicylate2660 26
66 Ammonia HR TT tube test 1-50 mg/l N Salicylate2660 28
85 Boron T tablet 0.1-2 mg/l B Azomethine3430 30
80 Bromine T tablet 0.05-13 mg/l Br2DPD5530 32
63 Chloramine,
mono PP
PP + liquid 0.04-4.50 mg/l Cl2Indophenol 660 34
90 Chloride T tablet 0.5 -25 mg/l Cl Silver nitrate/
turbidity
530 34
100 Chlorine T * tablet 0.01-6 mg/l Cl2DPD1,2,3 530 36, 38
101 Chlorine L * liquid 0.02-4 mg/l Cl2DPD1,2,3 530 36, 42
110 Chlorine PP * PP 0.02-2 mg/l Cl2DPD1,2 530 36, 46
120 Chlorine dioxide
T
tablet 0.05-11 mg/l ClO2DPD, Glycine1,2 530 50
105 Chlorine HR
(Kl) T
tablet 5-200 mg/l Cl2KI/Acid5530 56
130 COD LR TT tube test 0 -150 mg/l O2 Dichromate/H2SO41,2 430 58
131 COD MR TT tube test 0 -1500 mg/l O2 Dichromate/H2SO41,2 610 60
132 COD HR TT tube test 0 -15 g/l O2 Dichromate/H2SO41,2 610 62
204 Colour direct
reading
0-500 mg/l Pt Pt-Co-Scale1,2
(APHA)
150 Copper T * tablet 0.05-5 mg/l Cu Biquinoline4560 64
153 Copper PP PP 0.05-5 mg/l Cu Bicinchoninate 560 68
157 Cyanide PP + liquid 0.01-0.5 mg/l CN Pyridine-
barbituric acid1
580 70
160 Cyanuric Acid T tablet 0-160 mg/l CyA Melamine 530 72
165 DEHA T tablet +
liquid
20-500 μg/l DEHA PPST3560 74
167 DEHA PP PP + liquid 20-500 μg/l DEHA PPST3560 76
170 Fluoride L liquid 0.05-2 mg/l F SPADNS2 580 78
190 Hardness,
Calcium T
tablet 50-900 mg/l CaCO3Murexide 4560 80

1.1 Methods
1.1Table of Methods
No. Analysis Reagent Range Displayed
as
Method
[nm]
Page
191 Hardness,
Calcium 2, LR to T
tablet 0-500 mg/l
CaCO3
Murexide4560 88
200 Hardness, total T tablet 2-50 mg/l
CaCO3
Metallphthalein3560 82
201 Hardness, total
HR T
tablet 20-500 mg/l
CaCO3
Metallphthalein3560 84
205 Hydrazine P powder 0.05-0.5 mg/l N2H44-(Dimethyl-
amino)-
benzaldehyde3
430 86
206 Hydrazine L liquid 0.01-0.6 mg/l N2H44-(Dimethyl-
amino)-
benzaldehyde3
430 88
207 Hydrazine C ampoule 0.01-0.7 mg/l NN2H4PDMAB 430 90
210 Hydrogen
peroxide
tablet 0.03-3 mg/l H2O2DPD/catalyst5530 92
215 Iodine T tablet 0.05-3.6 mg/l I DPD 5530 94
220 Iron T tablet 0.02-1 mg/l Fe PPST 3560 96, 98
222 Iron PP PP 0.02-3 mg/l Fe 1,10-Phenan-
troline3
530 96, 100
223 Iron (TPTZ) PP PP 0.02-1.8 mg/l Fe TPTZ 580 96, 102
240 Manganese T tablet 0.2-4 mg/l Mn Formaldoxime 530 104
242 Manganese
LR PP
PP + liquid 0.01-0.7 mg/l Mn PAN 560 106
243 Manganese
HR PP
PP + liquid 0,1-18 mg/l Mn Periodate
oxidation2
530 108
250 Molybdate T tablet 1-50 mg/l MoO4Thioglycolate4430 110
252 Molybdate HR
PP
PP 0.5-66 mg/l MoO4Mercaptoacetic
acid
430 112
265 Nitrate TT tube test 1-30 mg/l N Chromotropic acid 430 114
270 Nitrite T tablet 0.01-0.5 mg/l N N-(1-Naphthyl)-
ethylendiamine 2,3
560 116
272 Nitrite LR PP PP 0.01-0.3 mg/l N Diazotization 530 118
280 Nitrogen, total
LR TT
tube test 0.5-25 mg/l N Persulfate
digestion method
430 120
281 Nitrogen, total
HR TT
tube test 5-150 mg/l N Persulfate
digestion method
430 122
290 Oxygen, active T tablet 0.1-10 mg/l O2DPD 530 124
292 Oxygen LR,
dissolved
ampoule 10-800 μg/l O2Rhodazine DTM 530 126
300 Ozone (DPD) T tablet 0.02-1 mg/l O3DPD/Glycine5530 128
70 PHMB T tablet 2-60 mg/l PHMB Buffer/Indicator 560 134
* = free, combined, total; PP = powder pack; T = tablet;
L = liquid; TT = tube test; LR = low range; MR = middle range; HR = high range
9

10 Thermo Scientific Orion AQUAfast AQ3700 Colorimeter User Guide
No. Analysis Reagent Range Displayed
as
Method
[nm]
Page
320 Phosphate,
ortho LR, T
tablet 0.05-4 mg/l PO4Ammonium-
molybdate
2,3
660 136,
138
321 Phosphate,
ortho HR T
tablet 1-80 mg/l PO4Vanando -
molybdate
2
430 136,
140
323 Phosphate,
ortho, PP
PP 0.06-2.5 mg/l PO4 Ascorbic acid
2
660 136,
142
324 Phosphate,
ortho, TT
tube test 0.06-5 mg/l PO4 Ascorbic acid
2
660 136,
144
327 Phosphate 1 C,
ortho
ampoule 5-40 mg/l PO4Vanado-
molybdate2
430 136,
146
328 Phosphate 2 C,
ortho
ampoule 0.05-5 mg/l PO4Stannous
chloride2
660 136,
148
325 Phosphate,
hydrolyzable, TT
tube test 0.02-1.6 mg/l P Acid digestion,
Ascorbic acid
2
660 136,
150
326 Phosphate,
total, TT
tube test 0.02-1.1 mg/l P Acid persulfate
digestion,
Ascorbic acid2
660 136,
152
329 pH-Value LR T tablet 5.2-6.8 — Bromocresolpurple5 560 154
330 pH-Value T tablet 6.5-8.4 — Phenolred5560 156
331 pH-Value L liquid 6.5-8.4 — Phenolred5560 158
332 pH-Value HR T tablet 8.0-9.6 — Thymolblue 5560 160
340 Potassium T tablet 0.7-12 mg/l K Tetraphenylborate-
Turbidity4
430 162
350 Silica T tablet 0.05-4 mg/l SiO2 Silicomolybdate
2,3
660 164
351 Silica LR PP PP 0.1-1.6 mg/l SiO2Heteropolyblue 2660 166
352 Silica HR PP PP 1-90 mg/l SiO2Silicomolybdate 2430 168
212 Sodium
hypochlorite T
tablet 0.2-16 % NaOCl Potassium
iodide5
530 170
355 Sulfate T tablet 5-100 mg/l SO4Bariumsulfate-
Turbidity
610 172
360 Sulfate PP PP 5-100 mg/l SO4Bariumsulfate-
Turbidity2
530 174
365 Sulfide tablet 0.04-0.5 mg/l S DPD/Catalyst 3,4 660 176
370 Sulfite T tablet 0.1-5 mg/l SO3DTNB 430 178
384 Suspended
Solids
direct
reading
0-750 mg/l TSS photometric 660 192
386 Turbidity direct
reading
0-1000 FAU Attenuated
Radiation Method
530 194
390 Urea T tablet +
liquid
0.1-3 mg/l Urea Indophenol/
Urease
610 180
400 Zinc T tablet 0.02 -1 mg/l Zn Zincon3610 182
1.1 Methods
1.1Table of Methods
* = free, combined, total; PP = powder pack; T = tablet;
L = liquid; TT = tube test; LR = low range; MR = middle range; HR = high range

11
Thermo Scientific Orion AQUAfast AQ3700 Colorimeter User Guide
1.1 Methods
The precision of AQUAfast®Reagent Systems (tablets, powder packs and tube tests) is identical
to the precision specified in standards literature such as American Standards (AWWA), ISO
etc.
Most of the data referred to in these standard methods relates to Standard Solutions.
Therefore they are not readily applicable to drinking-, boiler- or waste-water, since
various interferences can have a major influence on the accuracy of the method.
For this reason we don’t state such potentially misleading data.
Due to the fact that each sample is different, the only way to check the tolerances (‘precision’)
is the Standard Additions Method.
According to this method, first the original sample is tested. Then further samples (2 to 4) are
taken and small amounts of a Standard Solution are added, and further results are obtained.
The amounts added range from approximately half, up to double the amount present in the
sample itself.
These supplementary results make it possible to estimate the actual concentration of the
original sample by comparison.
Literature
The reagent formulations are based on internationally recognized test methods. Some are
described in national and/or international guidelines.
Deutsche Einheitsverfahren zur Wasser-, Abwasser- und Schlammuntersuchung
Standard Methods for the Examination of Water and Wastewater; 18th Edition, 1992
Photometrische Analysenverfahren, Schwedt,
Wissenschaftliche Verlagsgesellschaft mbH, Stuttgart 1989
Photometrische Analyse, Lange / Vejdelek, Verlag Chemie 1980
Colorimetric Chemical Analytical Methods, 9th Edition, London
Notes for searching:
Active Oxygen -> Oxygen, activ
Alkalinity-m -> Alkalinity, total
Alkalinity, total -> Alkalinity, total
Biguanide -> PHMB
Calcium Hardness -> Hardness, Calcium
Total Hardness -> Hardness, total
m-Value -> Alkalinity, total
p-Value -> Alkalinity-p
Silicon dioxide -> Silica
total Alkalinity -> Alkalinity, total
total Hardness -> Hardness, total
Langelier Saturation -> Mode function 70
Index (Water Balance)
1.
2.
3.
4.
5.

12 Thermo Scientific Orion AQUAfast AQ3700 Colorimeter User Guide
1.1 Methods
Acid demand to pH 4.3
with Tablet
0.1 – 4 mmol/l
1. Fill a clean vial (24 mm Ø) with 10 ml of the water
sample, close tightly with the cap.
2. Place the vial in the sample chamber making sure that
the marks are aligned.
3. Press ZERO key.
4. Remove the vial from the sample chamber.
5. Add one ALKA-M-METER tablet straight
from the foil to the water sample and crush the tablet
using a clean stirring rod.
6. Close the vial tightly with the cap and swirl several times
until the tablet is dissolved.
7. Place the vial in the sample chamber making sure that
the marks are aligned.
8. Press TEST key.
The result is shown in the display as Acid demand to
pH 4.3 in mmol/l.
prepare Zero
press ZERO
Zero accepted
prepare Test
press TEST
20

13
Thermo Scientific Orion AQUAfast AQ3700 Colorimeter User Guide
1.1 Methods
Notes:
1. The terms total Alkalinity, Alkalinity-m, m-Value and Acid demand to pH 4.3 are
identical.
2. For accurate results exactly 10 ml of water sample must be taken for the test.

14 Thermo Scientific Orion AQUAfast AQ3700 Colorimeter User Guide
1.1 Methods
Alkalinity, total = Alkalinity-m =
m-Value
with Tablet
5 – 200 mg/l CaCO3
1. Fill a clean vial (24 mm Ø) with 10 mlofthe water sample,
close tightly with the cap.
2. Place the vial in the sample chamber making sure that
the marks are aligned.
3. Press ZERO key.
4. Remove the vial from the sample chamber.
5. Add one ALKA-M-METER tablet straight
from the foil to the water sample and crush the tablet
using a clean stirring rod.
6. Close the vial tightly with the cap and swirl several times
until the tablet is dissolved.
7. Place the vial in the sample chamber making sure that
the marks are aligned.
8. Press TEST key.
The result is shown in the display as total Alkalinity.
prepare Zero
press ZERO
Zero accepted
prepare Test
press TEST
30

15
Thermo Scientific Orion AQUAfast AQ3700 Colorimeter User Guide
1.1 Methods
Notes:
1. The terms total Alkalinity, Alkalinity-m, m-Value and Alkalinity to pH 4.3 are identical.
2. For accurate results exactly 10 ml of water sample must be taken for the test.
3. Conversion table:
Acid demand to pH 4.3
DIN 38 409 (KS 4.3)
German
°dH*
English
°eH*
French
°fH*
1 mg/l CaCO30.02 0.056 0.07 0.1
*Carbonate hardness (reference = Hydrogencarbonate-anions)
Example:
10 mg/l CaCO3= 10 mg/l x 0.056 = 0.56 mg/l °dH
10 mg/l CaCO3= 10 mg/l x 0.02 = 0.2 mmol/l
4. CaCO3
°dH
°eH
°fH
°aH

16 Thermo Scientific Orion AQUAfast AQ3700 Colorimeter User Guide
1.1 Methods
Alkalinity-p = p-value
with Tablet
5 – 500 mg/l CaCO3
1. Fill a clean vial (24 mm Ø) with 10 ml of the water
sample, close tightly with the cap.
2. Place the vial in the sample chamber making sure that
the marks are aligned.
3. Press ZERO key.
4. Remove the vial from the sample chamber.
5. Ad d one ALKA-P-METER tablet straight
from the foil to the water sample and crush the tablet
using a clean stirring rod.
6. Close the vial tightly with the cap and swirl several times
until the tablet is dissolved.
7. Place the vial in the sample chamber making sure
that the marks are aligned.
8. Press TEST key.
The result is shown in the display as Alkalinity-p.
prepare Zero
press ZERO
Zero accepted
prepare Test
press TEST
35

17
Thermo Scientific Orion AQUAfast AQ3700 Colorimeter User Guide
CaCO3
°dH
°eH
°fH
°aH
5. By determining Alkalinity-p and Alkalinity-m it is possible to classify the alkalinity as
Hydroxide, Carbonate and Hydrogencarbonate.
The following differentiation is only valid if:
a) no other alkalis are present and
b) Hydroxide and Hydrogen are not present in the same water sample.
If condition b) is not fulfilled please get additional information from ”Deutsche
Einheitsverfahren zur Wasser-, Abwasser- und Schlammuntersuchung, D 8”.
Case 1: Alkalinity-p = 0
Hydrogen carbonate = m
Carbonate = 0
Hydroxide = 0
Case 2: Alkalinity-p > 0 and Alkalinity-m > 2p
Hydrogen carbonate = m – 2p
Carbonate = 2p
Hydroxide = 0
Case 3: Alkalinity-p > 0 and Alkalinity-m < 2p
Hydrogen carbonate = 0
Carbonate = 2m – 2p
Hydroxide = 2p – m
1.1 Methods
Notes
1. The terms Alkalinity-p, p-Value and Alkalinity to pH 8.2 are identical.
2. For accurate test results exactly 10 ml of water sample must be taken for the test.
3. This method was developed from a volumetric procedure for the determination of
Alkalinity-p. Due to undefined conditions, the deviations from the standardized method
may be greater.
4. Conversion table:
mg/l CaCO3°dH °fH °eH
1 mg/l CaCO3---- 0.056 0.10 0.07
1 °dH 17.8 ---- 1.78 1.25
1 °fH 10.0 0.56 ---- 0.70
1 °eH 14.3 0.80 1.43 ----

18 Thermo Scientific Orion AQUAfast AQ3700 Colorimeter User Guide
1.1 Methods
Aluminium
with Tablet
0.01 – 0.3 mg/l Al
1. Fill a clean vial (24 mm Ø) with 10 ml of the water
sample, close tightly with the cap.
2. Place the vial in the sample chamber making sure that
the marks are aligned.
3. Press ZERO key.
4. Remove the vial from the sample chamber.
5. Add one ALUMINIUM No. 1 tablet straight from the
foil to the water sample and crush the tablet using a
clean stirring rod and mix to dissolve the tablet.
6. Add one ALUMINIUM No. 2 tablet straight from the
foil to the same water sample and crush the tablet using
a clean stirring rod.
7. Close the vial tightly with the cap and swirl gently several
times until the tablets are dissolved.
8. Place the vial in the sample chamber making sure that
the marks are aligned.
9. Press TEST key.
Wait for a reaction period of 5 minutes.
Afterthereactionperiodisfinishedthe measurement starts
automatically.
The result is shown in the display in mg/l Aluminium.
prepare Zero
press ZERO
Zero accepted
prepare Test
press TEST
Countdown
5:00
40