火焰原子荧光光谱法测定土壤和固体废物样品中六价铬  

Determination of hexavalent chromium in soil and solid waste samples by flame atomic fluorescence spectrometry

作　　者：肖志博 吕晓惠 陈小迪 王昊 郝宏艳 杨亚敏 XIAO Zhibo;LYU Xiaohui;CHEN Xiaodi;WANG Hao;HAO Hongyan;YANG Yamin(North China Nonferrous Metals(Sanhe)Yanjiao Central Laboratory Co.,Ltd,Comprehensive Survey Brigade of North China Geological Survey Bureau,Langfang 065200,China)

机构地区：[1]华北有色(三河)燕郊中心实验室有限公司,华北地质勘查局综合普查大队,河北廊坊065200

出　　处：《化学分析计量》2025年第3期86-90,96,共6页Chemical Analysis And Meterage

基　　金：华北地质勘查局综合普查大队科研项目(普科2023-C06)。

摘　　要：建立了火焰原子荧光光谱法测定土壤和固体废物样品中六价铬。采用93℃的复合碱性浸提液,在恒温磁力搅拌器上对土壤和固体废物样品中六价铬进行恒温加热搅拌浸提,使用氯化镁和磷酸盐缓冲溶液体系有效抑制三价铬进入溶液中产生干扰。浸提液经离心过滤后,通过酸化处理获得六价铬的待测溶液。六价铬的质量浓度在0.10~10.0 mg/L范围内与吸光度线性关系良好,相关系数为0.9998,检出限为0.12 mg/kg。六价铬的平均回收率为97.1%~102%,测定结果的相对标准偏差为1.32%~3.16%(n=7),该方法可适用于土壤和固体废物的六价铬检测。A method for the determination of hexavalent chromium in soil and solid waste samples by flame atomic fluorescence spectrometry was established.The hexavalent chromium in soil and solid waste samples was extracted by constant temperature heating and stirring on a constant temperature magnetic stirrer using a composite alkaline extract at 93℃.A magnesium chloride and phosphate buffer solution system was used to effectively inhibit the interference of trivalent chromium into the solution.The extract was centrifuged and filtered,and the hexavalent chromium solution to be tested was obtained by acidification.The mass concentration of hexavalent chromium had a good linear relationship with the absorbance in the range of 0.10-10.0 mg/L,the correlation coefficient was 0.9998,and the detection limit was 0.12 mg/kg.The average recoveries of hexavalent chromium were 97.1%-102%,and the relative standard deviations of the determination results were 1.32%-3.16%(n=7).The method is suitable for the detection of hexavalent chromium in soil and solid waste.

关 键 词：六价铬 火焰原子荧光光谱法 碱性浸提液 土壤和固体废物 

分 类 号：O657.7[理学—分析化学]