LaMotte DC1600 Colorimeter User Manual
Page 74
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. Use 1.0 mL pipet (0354) to add 1.0 mL of *Phosphate Acid Reagent (V-6282).
Cap and mix.
5.
Use the 0.1 g spoon (0699) to add one measure of *Phosphate Reducing Reagent (V-6283). Cap and shake until
powder dissolves. Wait 5 minutes for full color development. Solution will turn blue if phosphates are present.
6.
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.
7.
Consult calibration chart to determine the phosphate concentration in parts per million (ppm).
DC1600 PHOSPHATE ~ LOW RANGE CALIBRATION CHART
%T
9
8
7
6
5
4
3
2
1
0
90
0.01
0.03
0.05
0.07
0.10
0.12
0.14
0.17
0.19
0.21
80
0.24
0.26
0.29
0.31
0.34
0.36
0.39
0.41
0.44
0.47
70
0.49
0.52
0.55
0.58
0.61
0.63
0.66
0.69
0.72
0.75
60
0.79
0.82
0.85
0.88
0.92
0.95
0.98
1.02
1.06
1.09
50
1.13
1.17
1.20
1.24
1.28
1.32
1.37
1.41
1.45
1.50
40
1.54
1.59
1.64
1.68
1.73
1.79
1.84
1.89
1.95
2.00
30
2.06
2.12
2.19
2.25
2.32
2.39
2.46
2.53
2.61
2.69
20
2.78
2.86
2.95
3.05
10
0
74