LaMotte SMART Spectro Spectrophotometer - Manual (Page 146)

PROCEDURE
Use universal sample holder.
1. Press and hold ON button until spectrophotometer turns on.
2. Scroll to and select PROGRAMMED TESTS from menu.
3. Scroll to and select ALL TESTS (or another sequence containing
35 Cyanide) from TESTING MENU.
4. Scroll to and select 35 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 Spectro. 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 OFF button to turn spectrophotometer off or press EXIT button to exit to
a previous menu or make another menu selection.
SMART Spectro Test Procedures 2.11 CYANIDE
Test P
rocedures