| 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: 铊 石墨炉原子吸收法 水 |
| DOI： |
| 分类号:O657.31 |
| 基金项目: |
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| Determination of Thallium in Environmental Water Samples by GF AAS |
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TANG Litong， CHEN Chun， PENG Hua， LI Hongliang， SHEN Jinchao
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Henan Environmental Monitoring Center， Zhengzhou， Henan 450004， China
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| 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 0.02μg/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 |
