LaMotte SMART3 Colorimeter - Manual (Page 165)

PROCEDURE
1. Press and hold until colorimeter turns on.
2. Press ENTER to selct TESTING MENU.
3. Select ALL TESTS (or another sequence containing 034 Cyanide) from
TESTING MENU.
4. Scroll to and select 034 Cyanide from menu.
5. Rinse a clean tube (0290) with sample water. Fill to the 10 mL line with sample.
6. Dip the end of plastic rod (0519) into water sample and touch it to a small piece
(1/4 inch) of pH 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 pH
test 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 pH test
paper. Continue adjustment until pH is between 10.5 and 11.0.
7. Insert tube into chamber, close lid and select SCAN BLANK.
8. 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.
9. Use one 0.1 g spoon (0699) to add one level measure of *Cyanide Cl Reagent
(2794DS). Cap and invert 10 times to mix. Wait 30 seconds.
10. During the 30 second waiting period, carefully fi ll a second 0.1 g spoon (0699)
with one level measure of *Cyanide Indicator Reagent (2793DS).
11. At the end of the 30 second waiting period, immediately add the level measure
of *Cyanide Indicator Reagent (2793DS). Cap and shake vigorously for 20
seconds. Wait 20 minutes for maximum color development.
12. At the end of the twenty minute waiting period, mix, insert tube into chamber,
close lid and select SCAN SAMPLE. Record result.
13. Press to turn colorimeter off or press
EXIT
to exit to a previous menu or
make another menu selection.
SMART3 Test Procedures 2.11 CYANIDE
Test P
rocedures