EPA Method 9213

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EPA Method 9213:
POTENTIOMETRIC DETERMINATION OF CYANIDE IN AQUEOUS SAMPLES AND DISTILLATES WITH ION-SELECTIVE ELECTRODE

Summary:
Cyanide is determined potentiometrically using a cyanide ion-selective electrode (ISE) in conjunction with a double-junction reference electrode and a pH meter with an expanded millivolt scale or an ISE meter capable of being calibrated directly in terms of cyanide concentration.

Scope:
This method can be used for measuring free (non-complexed) cyanide and hydrocyanic acid in drinking waters, natural surface waters, domestic and industrial wastewaters, and in soil extracts (ASTM methods D4646-87, D5233-92 or D3987-85). The method may also be used as the determinative step for total cyanide in distillate following the distillation in Method 9010.

Report Number:
SW-846 Ch 5