引用本文:汤立同,陈纯,彭华,李红亮,申进朝.石墨炉原子吸收法测定环境水样中铊[J].环境监控与预警,2016,8(3):31-33
TANG Li tong, CHEN Chun, PENG Hua, LI Hong liang, SHEN Jin chao.Determination of Thallium in Environmental Water Samples by GF AAS[J].Environmental Monitoring and Forewarning,2016,8(3):31-33
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石墨炉原子吸收法测定环境水样中铊
汤立同,陈纯,彭华,李红亮,申进朝
河南省环境监测中心,河南 郑州 450004
摘要:
对石墨炉原子吸收法测定水中铊的分析条件进行优化,并比较不同前处理方法对测定结果的影响。结果表明仪器的最佳分析条件为:灰化温度和原子化温度分别为700和1600 ℃,进样量为40 μL,基体改进剂为0.5%的钯与硝酸镁。直接进样、MIBK萃取法和铁沉淀富集3种前处理方法对应的检出限分别为0.76,0.07和0.02 μg/L;分别测定5,0.5和0.1μg/L含铊水样,其相对标准偏差分别为4.2%,6.1%和8.4%,加标回收率分别为92%,91%和88%,即3种样品前处理方式下,石墨炉原子吸收法对环境水样中铊均具有较好的测定效果。直接进样法适用于铊浓度较高的水样,MIBK萃取法和铁沉淀法则适用于较清洁水样。
关键词:    石墨炉原子吸收法  
DOI:
分类号:O657.31
基金项目:
Determination of Thallium in Environmental Water Samples by GF AAS
TANG Litong, CHEN Chun, PENG Hua, LI Hongliang, SHEN Jinchao
Henan Environmental Monitoring Center, Zhengzhou, Henan 450004, China
Abstract:
GF AAS conditions for determining thallium in environmental water samples were optimized and the effect of different pretreatment methods on the determination was studied. The optimized analysis conditions are as follows: ashing temperature 700 ℃; atomization temperature 1 600 ℃; sample load 40 μL; matrix modifier 0.5% Pd and Mg(NO3)2. The detection limits of the three pretreatment methods including direct injection, MIBK extraction, and ferrum precipitation enrichment were 0.76, 0.07,and 0.02μg/L. The relative standard deviations were 4.2%,6.1%,and 8.4% for 5,0.5, and 0.1 μg/L of water samples containing thallium, respectively. The recoveries of the three pretreatment methods were 92%,91%, and 88%. The method could satisfy the requirement for the determination of thallium in different environmental water samples using all of three pretreatments.
Key words:  Thallium  GF AAS  Water