LaMotte DC1600 Colorimeter User Manual
Page 58
PROCEDURE
1.
Use the 10 mL graduated cylinder (0416) to measure 10 mL of sample water. Pour into glass test tube (0786).
2.
Use the 1 mL pipet (0354) to add 1 mL of *Hydrochloric Acid, 2.5N (6251).
3.
Use the 0.1 g spoon (0699) to add 2 measures of *Ammonium Persulfate Reagent (6566). Add two drops of *Silver
Nitrate, 0.0141N (6346). Mix until the powder has dissolved. The solution will be slightly cloudy at this point.
4.
Use 10 mL graduated cylinder (0416) to add 5 mL of Sodium Citrate, 10% (6253).
5.
Use a second 1 mL pipet (0354) to add 1 mL of *Ammonium Hydroxide, Conc. (6537). Mix, then dilute to 25 mL
with deionized water.
6.
Use a third 1 mL pipet (0354) to add 1 mL of *Dimethylglyoxime, 1% (6254). Wait 20 minutes for color
development.
7.
At end of 20 minute waiting period fill a clean colorimeter tube (0967) to the 10 mL line with the developed test
sample.
8.
Fill a second clean colorimeter tube (0967) to 10 mL line with deionized water or untreated sample water.
9.
Select setting 2 on “Select Wavelength” knob and press the “30 Second Read” button.
10. Insert tube containing the untreated sample into colorimeter chamber and adjust to 100%T with “Set Blank” knob.
This is the 100%T blank.
11. Insert test sample (Step 7) into colorimeter chamber and press “30 Second Read” button. Record %T as soon as
reading stabilizes.
12. Consult calibration chart to determine nickel concentration in parts per million (ppm).
DC1600 NICKEL CALIBRATION CHART
%T
9
8
7
6
5
4
3
2
1
0
90
0.14
0.17
0.20
0.23
0.27
0.30
0.33
0.37
0.40
0.44
80
0.47
0.51
0.54
0.58
0.62
0.66
0.69
0.73
0.77
0.81
70
0.85
0.89
0.93
0.97
1.01
1.06
1.10
1.14
1.19
1.23
60
1.28
1.32
1.37
1.42
1.46
1.51
1.56
1.61
1.67
1.72
50
1.77
1.83
1.88
1.94
1.99
2.05
2.11
2.17
2.23
2.30
40
2.36
2.43
2.49
2.56
2.63
2.70
2.78
2.85
2.93
3.01
30
3.09
3.17
3.25
3.34
3.43
3.52
3.62
3.72
3.82
3.92
20
4.03
4.15
4.26
4.38
4.51
4.64
4.78
4.92
5.07
5.22
10
5.39
5.56
5.75
5.94
6.15
6.37
6.61
6.87
7.16
7.46
0
7.81
8.19
8.63
9.13
9.73
10.46
58