Determination of lead in hair and its segmental analysis by solid sampling electrothermal atomic absorption spectrometry
Determination of lead in hair and its segmental analysis by solid sampling electrothermal atomic absorption spectrometry
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DOI：
10.1016/j.sab.2010.02.016
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发表时间：
2010-04
期刊：
影响因子：
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通讯作者：
A. Baysal;S. Akman
中科院分区：
文献类型：
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作者：
A. Baysal;S. Akman
介绍了一种快速、实用的固体进样-原子吸收光谱法测定人发中铅的方法。头发样本用丙酮清洗一次;用蒸馏去离子水清洗三次，再用丙酮清洗一次，并在75°C下干燥。通常将0.05至1.0 mg干燥样品插入固体采样自动进样器的平台上。考察了热解温度、原子化温度、样品量以及添加改性剂（Pd/Mg）、助溶出剂（H2 O2和HNO 3）和表面活性剂（Triton X-100）对铅回收率的影响。将头发样品用丙酮洗涤一次;用蒸馏去离子水洗涤三次，再用丙酮洗涤一次，并在75°C下干燥。通常将0.05至1.0 mg干燥样品插入固体采样自动进样器的平台上。铅的检出限（3σ，N=10）为0.3ng/g。由于存在污染的风险和相对较高的空白值，不加任何试剂直接测定头发中的铅。最后，该方法适用于分段测定不同人的头发中的铅浓度，这对于了解一个人何时暴露于分析物以及暴露量是很重要的。为此，沿一条或几条紧密的线沿着切割0.5 cm的碎片，并通过固体取样进行分析。
A rapid and practical solid sampling electrothermal atomic absorption spectrometric method was described for the determination of lead in scalp hair. Hair samples were washed once with acetone; thrice with distilled-deionized water and again once with acetone and dried at 75°C. Typically 0.05 to 1.0mg of dried samples were inserted on the platforms of solid sampling autosampler. The effects of pyrolysis temperature, atomization temperature, the amount of sample as well as addition of a modifier (Pd/Mg) and/or auxiliary digesting agents (hydrogen peroxide and nitric acid) and/or a surfactant (Triton X-100) on the recovery of lead were investigated. Hair samples were washed once with acetone; thrice with distilled-deionized water and again once with acetone and dried at 75°C. Typically 0.05 to 1.0mg of dried samples were inserted on the platforms of solid sampling autosampler. The limit of detection for lead (3σ, N=10) was 0.3ng/g The addition of modifier, acids, oxidant and surfactant hardly improved the results. Due to the risk of contamination and relatively high blank values, the lead in hair were determined directly without adding any reagent(s). Finally, the method was applied for the segmental determination of lead concentrations in hair of different persons which is important to know when and how much a person was exposed to the analyte. For this purpose, 0.5cm of pieces were cut along the one or a few close strands and analyzed by solid sampling.