固体废物浸出液中氰化物测定方法的探讨

用金矿废渣样品进行氰化物的浸提试验，对浸提剂的pH值、浸提次数等条件进行优化。经实际样品验证，确定pH值〉12的碱性水溶液为最佳浸提剂，浸出液中易释放氰化物和总氰化物可用硝酸银滴定法或异烟酸一巴比妥酸分光光度法测定，方法检出限分别为0．25mg／L、0．001mg／L，加标回收率为90．0％～92．0％，测定结果的RSD〈8％。

Discussion on the Determination of Cyanide in Leaching Solution of Solid Waste

Determining of cyanide in solid wastes was investigated, using a kind of slag waste as actual sam- ple. Experimental conditions such as the pH of leaching fluid and extraction times were optimized. It had been verified by the actual sample that alkaline solution（pH 〉 12） could be used as the best extraction fluid. Easily released cyanide and total cyanide in leaching liquid could be measured by silver nitrate volumetric and nicotinic- barbituric spectrophotometry method. The method detection limits come to be 0.25 mg/L and 0. 001 mg/L, the recoveries ranged from 90.0% to 92.0% , and the precision was lower to 8%.