氰化物是环境中常见的污染物,因其毒性大,是环境保护监测的重要项目之一。气相色谱法测定氰化物具有简便、灵敏、快速、干扰少、线性范围宽等优点。方法原理是在酸性溶液中,CN~-与Br_2生成CNBr,以还原剂除去多余的Br_2,经色谱柱分离后用ECD选择性地测定。 Cyanide is a common pollutant in the environment. Due to its toxicity, cyanide is one of the most important environmental monitoring projects. Determination of cyanide gas chromatography has the advantages of simple, sensitive, fast, less interference, linear range and so on. The principle of the method is that CNBr is generated by CN ~ - and Br_2 in an acidic solution, and the excess Br_2 is removed by a reducing agent, and then selectively separated by an ECD after separation by a chromatographic column.