EPA Method 335.3

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EPA Method 335.3:
Cyanide by Automated Colorimetry. Official Name: Cyanide, Total (Colorimetric, Automated UV)

Summary:
Cyanide, as HCN, is released from cyanide complexes by means of UV digestion and distillation. Cyanides are converted to cyanogen chloride by reactions with chloramine-T which subsequently reacts with pyridine and barbituric acid to give a red-colored complex that is measured with an on-line colorimeter.

Scope:
The automated method determines cyanide in drinking and surface waters; domestic and industrial wastes.

Citation:
Methods for the Chemical Analysis of Water and Wastes (MCAWW) (EPA/600/4-79/020)

Interferences:
(A) Thiocyanates: Thiocyanates are positive interferences.(B) Sulfides: Sulfides can adversely effect the color procedure. Remove sulfide by precipitating with cadmium carbonate, and remove precipitate by filtration.

QC Requirements:
None.

Maximum Holding Time:
14 days (MCAWW, Table 1).

Media:
WATER

Subcategory:
Inorganic

Concentration:
0.005 - 0.5 mg/L

Sample Prep:
None.

Precision:
Precision and accuracy values were calculated using interlaboratory data from EPA-managed Water Pollution (WP) performance evaluation studies.

Detection:
None.

Revision Number:
Issued 1978

Test Description:
Cyanide, Total - Col

Report Number:
600/4-79-020