摘要
在磷酸介质中，氰根被饱和溴水氧化为溴化氰，剩余的溴水用磺基水杨酸除去。溴化氰与碘化钾反应生成单质碘，碘与淀粉显色，从而测定氰化物。其最大吸收波长λｍ ａｘ＝ ５６５ｎｍ ，ＣＮ－ 在０～１５μｇ／２５ｍ Ｌ范围内呈良好线性关系，表观摩尔吸光系数为３．１×１０４Ｌ·ｍ ｏｌ－ １·ｃｍ － １。已用于测定废水中的氰化物。
A new spectrophotometric method for the determination of trace cyanide has been developed.Saturated bromine water can oxidise cyanide in a H 3PO 4 medium,then the excess bromine water is removed by sulfosalicylic acid.The oxidation product reacts with potassium iodide to release iodine which forms a blue complex with starch with an absorption maximum at 565nm.The linear range of determination is 0～15μg/25mL.The molar absorptivity is 3 1×10 4L·mol -1 ·cm -1 .The method has been applied to the determination of trace cyanide in waste water with satisfactory results.
出处
《分析试验室》
CAS
CSCD
1999年第6期46-48,共3页
Chinese Journal of Analysis Laboratory
关键词
光度法
溴水
氰化物
废水
磺化钾
氰根
淀粉
Cyanide
spectrotometric determination
bromine water
waste water
