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| 聚氨酯泡塑预富集-石墨炉原子吸收法测定水中铊 |
| Determination of Thallium in Water by Polyurethane Foam Preconcentration Graphite Furnace Atomic Absorption Spectrometry |
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| DOI： |
| 中文关键词: 铊 聚氨酯泡塑预富集 石墨炉原子吸收光谱法 水质 |
| 英文关键词: Thallium Polyurethane foam preconcentration GFAAS Water quality |
| 基金项目:国家环境保护标准制修订基金资助项目（2014-19）；江苏省环境监测科研基金资助项目（1102） |
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| 中文摘要: |
| 水样经硝酸和过氧化氢消解，Tl+被氧化为Tl3+，在王水和Fe3+介质中，TlCl-4被聚氨酯泡塑吸附富集，沸水脱附后用石墨炉原子吸收光谱法测定。用硝酸钯-抗坏血酸基体改进剂提高测定灵敏度，方法在0 μg/L~250 μg/L范围内线性良好，方法检出限为001 μg/L。实际样品加标后6次测定结果的〖JP3〗RSD为30%~110%，平均加标回收率为950%~〖JP〗998%。有证标准物质的测定结果在标准值范围内，相对误差为-48%。 |
| 英文摘要: |
| A method for determining thallium in water was developed by graphite furnace atomic absorption spectrometry. Tl+ was oxidized to Tl3+ in nitrate acid and hydrogen peroxide digestion, TlCl-4 was concentrated by polyurethane foam in aqua regia and Fe3+ solution， then desorbed in boiling water. Palladium nitrate and ascorbic acid were screened as matrix modifier for improving sensitivity. The method had a good linearity in the range of 0 μg/L~25.0 μg/L. The MDL was 0.01 μg/L. The RSDs of spiked sample measurements repeated 6 times were from 3.0% to 11.0%, and the average recoveries were between 95.0% and 99.8%. The measuring result of a certified reference material was within the prescribed limit, the RE was -4.8%. |
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