EPA-NERL: 335.1:  Cyanides, amenable to chlorination

  • Summary
  • Analytes
  • Revision
  • Data and Sites
Official Method Name
Cyanides, Amenable to Chlorination (Titrimetric; Spectrophotometric)
Current Revision
Issued 1974
Spectroscopy (Colorimetry; Photometry)
Method Subcategory
Method Source
  Methods for the Chemical Analysis of Water and Wastes (MCAWW) (EPA/600/4-79/020)
Brief Method Summary
A portion of sample is dechlorinated at pH > 11 to decompose cyanides amenable to chlorination (CATC). Cyanide levels in the chlorinated sample and unchlorinated sample are determined using a total cyanide procedure (e.g., EPA Method 335.2). CATC is determined by difference of cyanide concentrations in the unchlorinated and chlorinated sample.
Scope and Application
This method determines cyanides amenable to chlorination (CATC) in drinking, surface, and saline waters; domestic and industrial wastes.
Applicable Concentration Range
See EPA Method 335.2
None given.
Quality Control Requirements
None given.
Sample Handling
None given.
Maximum Holding Time
None given.
Relative Cost
Less than $50
Sample Preparation Methods