LaMotte DC1600 Colorimeter User Manual
Page 78
PROCEDURE
1.
Rinse a clean colorimeter tube (0967) with sample water. Fill to the 10 mL line with sample.
2.
Select setting 6 on “Select Wavelength” knob and press “30 Second Read” button.
3.
Insert tube into colorimeter chamber and adjust to 100%T with “Set Blank” knob. This is the “100”%T blank.
4.
Remove tube from colorimeter. Add 6 drops *Silica Reagent #1 (V-4466). Cap and invert to mix.
5.
Add 12 drops of *Silica Reagent #2 (V-4467). Cap and mix. Wait 5 minutes.
6.
At end of 5 minute waiting period, add 8 drops of *Silica Reagent #3 (V-4468). Cap and mix. Wait 2 minutes.
7.
At end of 2 minute waiting period, use the 0.1 g spoon (0699) to add one measure of *Silica Reagent #4 (V-6284).
Cap and mix. Wait approximately 5 minutes for full color development.
8.
At end of 5 minute waiting period, press the “30 Second Read” button and insert tube into colorimeter chamber.
Record %T as soon as reading stabilizes.
9.
Consult calibration chart to determine silica concentration in parts per million (ppm).
NOTE: For the best possible results carry a reagent blank through the procedure to compensate for any silica which
may be present in the reagents or glassware. The test procedure is run on 10 mL of silica-free water and this tube is
used to set the meter at 93.5% T, (which corresponds to 0 ppm), then continue with the unknown sample tests.
DC1600 SILICA ~ LOW RANGE CALIBRATION CHART
%T
9
8
7
6
5
4
3
2
1
0
90
0.01
0.03
0.06
0.08
80
0.11
0.13
0.16
0.19
0.21
0.24
0.27
0.29
0.32
0.35
70
0.38
0.41
0.44
0.47
0.50
0.53
0.56
0.59
0.62
0.65
60
0.68
0.72
0.75
0.78
0.82
0.85
0.89
0.92
0.96
1.00
50
1.04
1.07
1.11
1.15
1.19
1.23
1.27
1.32
1.36
1.40
40
1.45
1.50
1.54
1.59
1.64
1.69
1.74
1.79
1.84
1.90
30
1.95
2.01
2.07
2.13
2.19
2.26
2.32
2.39
2.46
2.53
20
2.60
2.68
2.76
2.84
2.92
3.01
3.10
3.20
3.30
3.41
10
3.51
3.63
3.75
3.88
4.02
4.16
4.32
4.49
4.67
4.87
0
5.09
5.33
5.61
5.93
6.30
6.75
7.32
8.12
9.45
78