This method is for the determination of cyanides amenable to chlorination in drinking, surface and saline waters, domestic and industrial wastes. The titration procedure is used for measuring concentrations of cyanide exceeding 1 mg/L after removal of the cyanides amenable to chlorination. Below this level the colorimetric determination is used.
A portion of the sample is chlorinated at a pH > 11 to decompose cyanides amenable to chlorination (CATC). Cyanide levels in the chlorinated sample and unchlorinated sample are then determined using a method for total cyanide. Cyanides amenable to chlorination are then calculated by difference of concentrations in the unchlorinated and chlorinated sample.
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| Hold Times, Preservatives, Preps, Collection, Analytical & Documentation | |
|---|---|
| Holding Time: | None noted in method. |
| Preservatives: | None noted in method. |
| Required Preps: | 1 L HDPE bottle with Teflon-lined lid. |
| Collection Method: | Grab sampling |
| Analytical Methodology: | Titrimetric and spectrophotometric |
| Documentation: | 
335.1
|
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
| Cyanides | CN- |
57-12-5 |
1 |
mg/L |
* The analytes and detection limits listed for each method represent the typical detection limits and analytes reported for that particular method. Keep in mind that analyte lists may vary from laboratory to laboratory. Detection limits may also vary from lab to lab and are dependent upon the sample size, matrix, and any interferences that may be present in the sample.