EPA Method 9015

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EPA Method 9015:
METAL CYANIDE COMPLEXES BY ANION EXCHANGE CHROMATOGRAPHY AND UV DETECTION

Summary:
For aqueous samples containing from 0.2 to 200 mg/L metal cyanide complexes, dissolved metal cyanide complexes are separated and quantified using anion exchange chromatography coupled with UV detection. For solid waste samples, the alkaline extraction procedure described in Method 9013 is necessary prior to chromatographic analysis of the resulting extract. A sample volume is injected into the chromatograph and onto an anion exchange column where the metal cyanide analytes are separated from the sample matrix by temporary retention on the column. The metal cyanide complexes are eluted from the column by the eluent gradient and detected as signal peaks using UV absorbance at 215 nm. Their concentrations in the sample are determined by comparison of the analyte peak area with a standard calibration plot. The concentration range will differ depending on the specific metal cyanide complex, with some complexes exhibiting greater or lesser detection sensitivity than others based on their molar absorptivity. Under the alkaline conditions of the analysis, ferricyanide ([Fe(CN)6]3-) is reduced to ferrocyanide ([Fe(CN)6]4-) co-eluting as a single analyte peak, with any unreduced ferricyanide exhibited as tailing on the ferrocyanide peak.

Scope:
This test method covers the determination of metal cyanide complexes in waters and extracts of solid wastes using anion exchange chromatography and UV detection.

Report Number:
not available