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DR/2400
Method 8027
Powder Pillows
Scope and Application:
* Adapted from Epstein, Joseph, Anal. Chem. 19(4), 272 (1947)
Tips and Techniques
• Use a water bath to maintain the optimum temperature for the reaction in this test (25 °C). Samples at less than 23 °C require
longer reaction times, and samples at greater than 25 °C yield low results.
• For more accurate results, determine a reagent blank value for each new lot of reagent. Follow the procedure using deionized
water in place of the sample. Subtract the reagent blank value from the final results or perform a reagent blank adjust
instrument manual for more information on Running a Reagent Blank.
• Wipe the outside of sample cells before each insertion into the instrument cell holder. Use a damp towel followed by a dry one to
remove fingerprints or other marks.
• The timing for steps 2 through 8 is critical. You may find it useful to open the necessary reagents before starting this sequence.
• All samples to be analyzed for cyanide should be treated by acid distillation except when experience has shown that there is no
difference in results obtained with or without distillation. See Acid Distillation on page 5.
• See Pollution Prevention and Waste Management on page 3 for proper disposal of solutions containing cyanide.
Powder Pillows
Hach Programs
1.
Touch
.
Hach Programs
Select program
.
160 Cyanide
Touch
.
Start
Cyanide_PP_Other_PPZ_Eng_Ody.fm
For water, wastewater, and seawater
2.
Using a graduated
cylinder, fill a round
sample cell with a 10 mL
of sample.
Pyridine-Pyrazalone Method*
(0.001 to 0.240 mg/L CN
3.
Add the contents of
one CyaniVer 3 Cyanide
Reagent Powder Pillow.
Cap. (This is the prepared
sample.)
Cyanide
.
See the
Method 8027
4.
Shake the sample cell
for 30 seconds.
Cyanide
Page 1 of 8
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