Hach DR/700 Procedures Manual page 569

CYANIDE
For water, wastewater and seawater
Pyridine-Pyrazalone Method*
1.
Fill a 10-mL cell
to the 10-mL line
with sample.
Note: If samples cannot
be analyzed
immediately, see
Sampling and Storage
following these steps.
Adjust the pH of the
stored samples before
analysis.
Note: A 25-mL sample
can be tested using
25-mL sample cells and
optional reagents.
Note: For proof of
accuracy, use a
0.10 mg/L cyanide
standard solution
(preparation given in
Accuracy Check) in
place of the sample.
*Adapted from Epstein, J. Anal. Chem., 1947, 19(4), 272
(0 to 0.200 mg/L)
2.
Add the contents
of one CyaniVer 3
Cyanide Reagent
Powder Pillow. Cap
the sample cell.
61-13
Method 8027
30 seconds
3.
Shake the sample
cell for 30 seconds.