LaMotte DC1600 Colorimeter - Manual (Page 36)

PROCEDURE
1. Rinse a clean colorimeter tube (0967) with sample water. Fill to the 10 mL line with sample.
2. Dip the end of plastic rod (0519) into water sample and touch it to a small piece (1/4 inch) of pH Short Range Test
Paper (2955) to wet paper. Read pH immediately from color chart.
a)
If pH is below 10, raise the pH by adding *Sodium Hydroxide, 1N (4004) one drop at a time with stirring.
Check pH after each drop with a new piece of pHydrion paper. Continue adjustment until pH is between 10.5
and 11.0.
b) If pH is above 11.5, lower pH by adding *Hydrochloric Acid (6130) one drop at a time with stirring. Check pH
after each drop with a new piece of pHydrion paper. Continue adjustment until pH is between 10.5 and 11.0.
3. Select setting 5 on “Select Wavelength” knob and press “30 Second Read” button.
4. Insert the tube into colorimeter chamber and adjust to 100% T with “Set Blank” knob. This is the 100% T blank.
5. Remove tube from colorimeter. Use the 1.0 mL pipet (0354) to add 1.0 mL of Cyanide Buffer (2850PS) to tube. Cap
and mix.
6. Use one 0.1 g spoon (0699) to add one measure of *Cyanide Cl Reagent (2794DS). Cap and invert 10 times to mix.
Wait 30 seconds.
7. At the end of the 30 second waiting period, use a second 0.1 g spoon (0699) to add one measure of *Cyanide
Indicator Reagent (2793DS). Cap and shake vigorously for 15 - 20 seconds. Wait twenty minutes for maximum color
development.
8. At the end of the twenty minute waiting period, press “30 Second Read” button and insert tube into colorimeter
chamber. Record % T as soon as reading stabilizes.
9. Consult calibration chart to determine cyanide concentration in parts per million (ppm).
DC1600 CYANIDE CALIBRATION CHART
%T 9 8 7 6 5 4 3 2 1 0
90 0.01 0.01 0.01 0.01 0.01 0.02 0.02 0.02 0.02 0.02
80 0.03 0.03 0.03 0.03 0.03 0.03 0.04 0.04 0.04 0.04
70 0.05 0.05 0.05 0.05 0.05 0.06 0.06 0.06 0.06 0.06
60 0.07 0.07 0.07 0.07 0.08 0.08 0.08 0.08 0.09 0.09
50 0.09 0.10 0.10 0.10 0.10 0.11 0.11 0.11 0.12 0.12
40 0.12 0.13 0.13 0.13 0.14 0.14 0.14 0.15 0.15 0.15
30 0.16 0.16 0.17 0.17 0.18 0.18 0.18 0.19 0.19 0.20
20 0.20 0.21 0.21 0.22 0.23 0.23 0.24 0.25 0.25 0.26
10 0.27 0.27 0.28 0.29 0.30 0.31 0.32 0.33 0.34 0.36
0 0.37 0.39 0.41 0.43 0.45 0.48 0.51
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