氢化物-原子吸收光谱法测定不同产地土牛膝中砷、汞的含量  

Determination of the AS and Hg in Achyranthes Aspera L in Different Habitats by Flame Atomic Absorption Spectrophotometry

作　　者：魏得良[1] 黄志芳[2] 黄志红[1] 胡吉林[1] 彭彦茜[1] 

机构地区：[1]湘南学院化学与生命科学系,湖南郴州423000 [2]广州市第十二人民医院,广东广州510620

出　　处：《福建分析测试》2010年第4期29-32,共4页Fujian Analysis & Testing

基　　金：湖南省教育厅科研基金资助项目(05C630);湖南省科技厅科研基金资助项目(06FJ4099)

摘　　要：本文采用湿法消解氢化物-原子吸收光谱法,测定不同产地土牛膝中砷、汞的含量。结果显示标样中砷、汞的浓度与吸光度呈良好的线性关系,校准曲线的线性回归方程分别为:A=0.1753C+0.72380、A=0.0637C+0.0093,相关系数R=0.9999、R=0.9993,检出限为0.0585μg·L-1、0.0094μg·L-1,相对标准偏差(n=10)为1.0%～5.0%、1.0%～5.0%,加标回收率为97%～102%、98%～101%。样品中砷、汞含量的实验结果为:北京产土牛膝:1040.1415、364.4999μg·L-1,成都产土牛膝:222.0217、211.4003μg·L-1,郴州产土牛膝:1068.0549、244.4386μg·L-1,长沙产土牛膝:1256.5094、289.0937μg·L-1。结论是本法简单易行,方便快捷,灵敏度和精密度高,选择性好,结果令人满意。Objective：Determination of the As and Hg contents in achyranthes aspera L in different habitats. Methods： Applied flame atomic absorption spectrophotometer. Results：The concentration of As and Hg in spesimen and light absorption was good linear correlative, Regression equiation was A=0.1753C＋0.72380、A=0.0637C＋0.0093 with correlative coefficient R=0.9999、R=0.9993 and detection limit 0.0585μg·L-1、0.0094μg·L-1 respectively. The relative standard deviation（n=10） was 1.0% ～5.0% 、1.0% ～5.0% respectively. The recovery rate of standard addition was 97% ～102% 、98% ～101% respectively. The level of Cu in the Achyranthes aspera of Beijing, Chengdu, chenzhou and Changsha was 1040.1415、 364.4999μg ·kg-1, 222.0217、211.4003μg ·kg-1, 1068.0549、244.4386μg ·kg-1 and 1256.5094、289.0937μg ·kg-1 respectively. Conclution：The method was quick, simple and convenient. high sensitivivty and precision, good selectivity . The results were satisfactory.

关 键 词：氢化物-原子吸收光谱 砷、汞 土牛膝 不同产地 

分 类 号：O657.3[理学—分析化学]