Hach DR/850, Procedures Manual, Page: 155 / 460

155
Method 8027
CYANIDE
(0 to 0.240 mg/L) For water, wastewater, and seawater
Pyridine-Pyrazalone Method
*
1.
Enter the stored
program number for
cyanide (CN).
Press:
PRGM
The display will show:
PRGM ?
Note: For most accurate
results, perform a Reagent
Blank Correction using
deionized water (see
Section 1).
2.
Press:
23 ENTER
The display will show
mg/L, CN and the
ZERO icon .
Note: Adjust the pH of
stored samples before
analysis.
3.
Fill a sample cell
with 10-mL of sample.
Note: Samples at less than
23 °C require a longer
reaction time and samples
at greater than 25 °C give
low test results. Sample
temperature must be
23-25 °C.
4.
Add the contents of
one CyaniVer 3 Cyanide
Reagent Powder Pillow.
Cap the sample cell.
* Adapted from Epstein, Joseph, Anal. Chem . 19 (4), 272 (1947)