Method SM 4500-CN-F

Free Cyanide

This method is for the determination of free cyanide (CN-) in groundwater and drinking water using a cyanide selective electrode. The sample is distilled and an aliquot is analyzed using an ion selective electrode (ISE).

(Standard Methods)


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Method Data

Hold Times, Preservatives, Preps, Collection, Analytical & Documentation
Holding Time:   14 days from sample collection to analysis if sample is preserved. 48 hours from sample collection to analysis if un-preserved.
Preservatives:   Preserve with ascorbic acid and NaOH to pH > 12 is sample is chlorinated and just NaOH if there is no chlorination.
Required Preps:   125 mL polyethylene bottle
Collection Method:   Grab sampling
Analytical Methodology:   ISE

Analyte List*

Analyte Formula CAS Number Detection Limit

* 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.