LaMotte DC1600 Colorimeter User Manual
Page 56
PROCEDURE
1.
Rinse then fill clean colorimeter tube (0967) to 10 mL line with sample water.
2.
Select setting 4 on the “select wavelength” knob and press the “30 Second Read” button.
3.
Insert tube into colorimeter chamber and press “ON/OFF” button.
4.
Adjust to 0 ppm with the “Set Blank” knob. This is the sample blank.
5.
Remove tube from colorimeter chamber. Use a 1.0 mL pipet (0372) to add 1.0 mL of *Mo Buffer (3997). Cap and
mix.
6.
Use a second 1.0 mL pipet (0372) to add 1.0 mL of *Molybdenum Oxidizing Regent (6485). Cap and mix.
7.
Use 0.05 g spoon (0696) to add one measure of Molybdenum Indicator Powder (6486). Cap and mix until powder
dissolves. Solution will turn yellow if molybdenum is present.
8.
Insert tube into colorimeter chamber and press “30 Second Read” button. Record %T as soon as reading stabilizes.
9.
Consult calibration chart to determine molybdenum concentration in parts per million (ppm).
DC 1600 MOLYBDENUM THIOGLYCOLATE CALIBRATION CHART
%T
9
8
7
6
5
4
3
2
1
0
90
0.14
0.30
0.46
0.63
0.79
0.96
1.13
1.30
1.47
1.65
80
1.83
2.01
2.19
2.37
2.56
2.75
2.94
3.13
3.32
3.52
70
3.72
3.92
4.13
4.34
4.55
4.76
4.98
5.20
5.42
5.65
60
5.88
6.11
6.34
6.58
6.83
7.08
7.33
7.58
7.84
8.11
50
8.38
8.65
8.93
9.21
9.50
9.79
10.09
10.40
10.71
11.03
40
11.35
11.68
12.02
12.36
12.72
13.08
13.45
13.83
14.21
14.61
30
15.02
15.44
15.87
16.31
16.76
17.23
17.71
18.21
18.72
19.25
20
19.80
20.37
20.96
21.57
22.21
22.87
23.56
24.29
25.04
25.84
10
26.67
27.56
28.49
29.48
30.54
0
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