全自动流动注射分析仪测定水样中六价铬含量  

Determination of hexavalent chromium in water samples by automatic flow injection analyzer

作　　者：郝胜涛[1] 孙慧莹[1] 李小辉[1] 孙瑞海 钟盼[1] HAO Sheng-tao;SUN Hui-ying;LI Xiao-hui;SUN Rui-hai;ZHONG Pan(Henan Province Rock and Mineral Testing Center,Zhengzhou 450012,China;Zhengzhou Yongbang Measurement and Control Technology Co.,Ltd.,Zhengzhou 450001,China)

机构地区：[1]河南省岩石矿物测试中心,河南郑州450012 [2]郑州永邦测控技术有限公司,河南郑州450001

出　　处：《化学工程师》2023年第6期19-22,共4页Chemical Engineer

基　　金：国家重点研发计划(No.2019YFC1804805);豫地矿青科创[2020]9号。

摘　　要：在酸性条件下,水中Cr(Ⅵ)可与二苯碳酰二肼反应生成紫红色化合物,于540nm波长处进行分析。建立了对样品进行有效前处理后,以无水乙醇代替丙酮为显色剂的溶剂,采用全自动流动注射分析仪测定水样中Cr(Ⅵ)的含量的分析方法。方法检出限为0.0005mg·L^(-1),精密度(RSD,n=6)为0.49%~1.43%。加标回收率为95.0%~109%。本方法操作简单、快速,对环境污染小,准确度、精密度高,检出限低,人工误差小,成本低,可用于批量水样分析。Under acidic conditions,hexavalent chromium in water can react with diphenylcarbazide to form purplish red compounds,which are analyzed at 540 nm wavelength.An analytical method was established for the determination of hexavalent chromium in water samples with an automatic flow injection analyzer after effective pretreatment of the sample,using absolute ethanol instead of acetone as the solvent for the color reagent.The detection limit of the method is 0.0005mg·L^(-1),and the precision(RSD,n=6)is 0.49%~1.43%.The add standard recovery rate is 95.0%~109%.The method is simple,fast,less environmental pollution,high accuracy and precision,low detection limit,small manual error,and low cost,which can be used for batch water sample analysis.

关 键 词：全自动流动注射分析仪 六价铬 无水乙醇 

分 类 号：O657.3[理学—分析化学] X832[理学—化学]