含硫氰酸盐、硫化物固体废物中总氰化合物测定方法

Determination method for total cyanide in solid wastes containing thiocyanate and sulfide

摘要: 实验建立了含硫氰酸盐、硫化物固体废物中总氰化合物的测定方法，采用硝酸银滴定法、异烟酸-吡唑啉酮分光光度法分别测定总氰化合物含量高、低的样品。通过条件实验优化了前处理方式、称样量和干扰去除方法。该方法测定结果的相对标准偏差为0.43 %～1.33 %，加入标准物质回收率为91.5 % ～101.5 %，精密度和准确度良好，符合测定要求。

Abstract: The experiment established a determination method for total cyanide in solid wastes containing thiocyanate and sulfide,where silver nitrate titration and isonicotinic acid-pyrazolone spectrophotometry are used to determine the samples with high and low contents of cyanide respectively.Condition test was carried out to optimize the pre-treatment means,sample weight and interference elimination method.The method has a RSD of 0.43 %-1.33 %,recovery rate of 91.5 %-101.5 %,good precision and accuracy,and meets the determination requirements.