固体显色剂用于水中六价铬的快速现场测定

Rapid and In-situ Determination of Chromium( Ⅵ) in Water by Solid Chromogenic Reagent

以固体二苯碳酰二肼为显色剂、氯化钠为增溶剂、氨基磺酸为固体酸，采用便携式分光光度计，建立了水中六价铬的快速现场测定方法。研究了固体混合试剂用量对体系吸光度的影响，优化了现场测试条件，与标准方法对比验证了现场测试的准确性。结果表明，Cr（Ⅵ）在0．010～1．000mg／L的浓度范围内呈现良好的线性关系，加标回收率（n=5）为90．0％～102．0％，相对标准偏差为0．29％～4．45％，方法检出限为0．004mg／L。该方法具有简便、快速、准确的特点，尤其适用于场地／区域地下水污染调查评价、水污染事故的应急监测分析等领域。

With solid diphenylcarbazide as the chromogenic reagent, sodium chloride as solubilizer and amino sulfonic acid as solid acid, a rapid and in-situ determination method of chromium （ Ⅵ ） in water was established using portable spectrophotometer. The influence of the dosage of solid reagent on the absorbency value of the system was studied. The conditions for in-situ determination were optimized, and the accuracy of the method proposed was proved by comparing with the standard method. The results showed that the linear range of chromium （ Ⅵ） was 0. 010 to 1. 000 mg/L. The recovery rate （ n = 5 ） was 90.0% to 102.0%, RSD was 0.29% to 4.45%, and the detection limit was 0.004 mg/L. This method is simple, rapid and accurate, especially suitable for groundwater pollution investigation and water pollution accident emergency monitoring.