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氯离子与硫氰酸汞和硝酸铁在酸性介质中反应生成红色络合物的吸光度与水中氯离子的含量成正比 ,根据这一反应原理 ,建立了用流动注射—分光光度法测定微量氯离子的自动分析新方法。利用单因素实验方法对影响灵敏度的各因素进行优选 ,得出最佳条件。本方法的检测极限为 2 0 μg/ L,相对标准偏差为0 .89% ,回收率为 1 0 0 %～ 1 0 5 %。分析速度为 60～ 1 2 0样 / h,适用于火电厂炉水中微量氯离子的测定
According to this reaction principle, the determination of trace chloride ion by flow injection - spectrophotometry was established based on the reaction between chloride ion and mercuric thiocyanate and ferric nitrate in acidic medium. The absorbance of red complex is proportional to the content of chloride ion in water. Automatic analysis of new methods. The factors affecting the sensitivity were optimized by single factor experiment, and the best conditions were obtained. The detection limit of this method is 20 μg / L, the relative standard deviation is 0.89% and the recovery rate is 100% ~ 105%. Analysis speed of 60 ~ 120 samples / h, suitable for determination of trace chlorine in thermal power plant water