Determination of thallium in soils by flame atomic absorption spectrometry
Determination of thallium in soils by flame atomic absorption spectrometry
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DOI：
10.1007/s0021663560348
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发表时间：
1996-11-01
期刊：
影响因子：
--
通讯作者：
Kubota, M
中科院分区：
文献类型：
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作者：
Asami, T;Mizui, C;Kubota, M
本文叙述了用火焰原子吸收法测定土壤中铊的方法。方法是用HClO_4/HNO_3消化5克土壤，然后用5公吨二异丙醚从含Ce（SO_4）的HBr溶液中分离铊。通过直接吸入分光光度计测定有机相中的Tl。5份重复样品的相对标准偏差百分比（% RSD）约为1%。当用50公吨土壤溶液对应2.5克土壤时，该方法的检出限（S/N = 3）为：水溶液0.001毫克/升，土壤0.02毫克/千克干重。即使在未受污染的土壤中也能测定出铊的浓度。该方法不受土壤中各种离子的影响，能回收近100%的铊。日本18个未污染表层土壤的算术平均值（范围）为0.33（0.10-0.56）mgTl/kg DW。
A method is described for the determination of Tl in soils by FAAS, involving extraction of Tl from 5 g of soil by digestion with HClO4/HNO3 followed by separation of the extracted Tl into 5 mt of diisopropylether from HBr solution, including Ce(SO4)(2). Tl in the organic phase is determined by direct aspiration into the spectrophotometer. The percentage relative standard deviation (% RSD) for 5 replicate samples is about 1%. The detection limits (S/N = 3) of this method are 0.001 mg/L for aqueous solution and 0.02 mg/kg DW for soil, when 50 mt of soil solution corresponding to 2.5 g soil are used. The Tl concentration even of unpolluted soils can be determined. The method was shown to be unaffected by the presence of various ions in soil and was able to recover nearly 100% Tl added to soils, The arithmetic mean (range) of 18 Japanese unpolluted surface soils was 0.33 (0.10-0.56)mgTl/kg DW.