Development and Evaluation of Procedures for the Analysis of Simple Cyanides, Total Cyanide, and Thiocyanate in Water and Wastewater

摘要

Seven methods for the analysis of simple cyanides have been investigated. Included are (1) an ion-exchange procedure, (2) a continuous-flow distillation, (3) and EDTA electrode method, (4) the American Iron and Steel Institute aeration method, (5) an EDTA aeration method, (6) the modified Roberts-Jackson method, and (7) the EPA procedure for Cyanides Amenable to Chlorination. Of all of the procedures studied, the modified Roberts-Jackson method is the best. It gives complete recovery from all but one of the simple cyanides without decomposing the complex cyanides. Colorimetric high performance liquid chromatography and atomic absorption spectrophotometric methods for the analysis of thiocyanates were investigated. All these methods are based on the formation and extraction of a thiocyanate-pyridine-copper (II) complex.