固体废物浸出液中氰化物分析方法研究

Study on The Analytical Method for Leaching Toxicity of Cyanides in Solid Wastes

目前针对固体废物浸出液中氰化物测定的标准方法尚未颁布，本文用纯水提取固体废物，经18±2小时翻转振荡，并用容量法或光度法进行浸出液中易释放及总氰化物的测定。经实验证明，浸出液需在4℃的冰箱内保存，并于24小时内分析，方法检出限范围为0．002-0．24mg／L。两类检出实际样品易释放氰化物RSD在6．9-10．5％，总氰化物RSD在5．4-9．9％；在浸出液中加标，易释放氰化物回收率范围分别为90．0％-97．0％，总氰化物加标回收率范围为86．7％-97．8％。该法检出限低，准确度、精密度高，操作性好，易于推广使用，是固体废物浸出液中氰化物测定的理想方法。

The standard method for analyzing leaching toxicity of cyanides in solid wastes was not yet issued Solid wastes were extracted by water, and after flip oscillation for 18±2 hours, the amount of cyanides in leachates were determined by volumetric method or photometric method. It was proved that the leaching liquid should be preserved under 4 ℃ , and be analyzed within 24 hours. The results indicated that the detection limit was from 0.002 mg/L to 0.24mg/L, and the RSD was from 6.9 to 10.5%（ easy to release cyanides ）, and from 3.4 to 9.9%（ total cyanides ）. In spiked leaching liquid, the recovery of easy release cyanides was in the range of 90.0% - 97.0%, with total cyanides in the range of 86.7% - 97.8%. The method has advantages of high accuracy and good operation, and it is a good method to measure leaching toxicity of cyanides in solid wastes