EPA Method 335.2

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EPA Method 335.2:
Cyanide, total, in Water. Official Name: Cyanide, Total (Titrimetric; Spectrophotometric)

The cyanide as hydrocyanic acid (HCN) is released from cyanide complexes by means of a reflux-distillation operation and absorbed in a scrubber containing sodium hydroxide solution. The cyanide ion in the absorbing solution is then determined by volumetric titration using silver nitrate or colorimetrically using pyridine-barbituric acid procedure.

This method is applicable to the determination of cyanide in drinking, surface and saline waters; and domestic and industrial wastes.

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

(1) Oxidizing agents can destroy cyanides during storage.(2) Sulfide can complex with cyanide in sample or distillate.(3) Fatty acids cause interference during distillation.(4) Carbonate causes interference during distillation.(5) Aldehydes cause interference during distillation.(6) Glucose/Sugars cause interference during distillation.(7) Sulfur-containing compound causes interference during distillation by forming free sulfide that is captured in distillate.

QC Requirements:
not included

Maximum Holding Time:
14 days.



0.02 - 1 mg/L

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

The colorimetric procedure is sensitive down to the specified minimum level.

Revision Number:
Issued 1974; Editorial Revision 1974 & 1978; Technical Revision 1980

Test Description:
Cyanide, Total -Titr

Report Number: