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The stable isotopic compositions of nitrogen and carbon in cyanide compounds can be determined by combusting the compounds to form N2 gas and CO2 gas, and analyzing the gases by mass spectrometry. Free cyanide (CN-^ + HCN^) in simple solutions can also be analyzed by first precipitating the cyanide as copper(n)ferrocyanide and then combusting the precipitate. Reproducibility is ±0.5 permil or better for 813C and ±0.3 permil or better for 8 15N. Hydrated compounds do not combust as well or as reproducibly as anhydrous compounds. Deliquescent compounds such as NaCN should be dried by heating before analysis. The analytical methods described herein are sufficiently reliable to apply stable isotope techniques to problems of cyanide degradation at active and abandoned heap leach mines.

Methods for analysis of 15N/14N and 13C/12C in solid and aqueous cyanides; an interim report