Evaluation of a sequential extraction procedure for the fractionation of thallium in soils and determination of the content by flame atomic absorption spectrometry
Evaluation of a sequential extraction procedure for the fractionation of thallium in soils and determination of the content by flame atomic absorption spectrometry
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DOI：
10.1080/00380768.2004.10408487
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发表时间：
2004-02
影响因子：
2
通讯作者：
Li Wang;M. Kubota;T. Higashi;T. Fujimura
中科院分区：
文献类型：
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作者：
Li Wang;M. Kubota;T. Higashi;T. Fujimura
摘要为了评价土壤中铊的存在形态，在Tessier等人描述的方法的基础上，发展了一种略微改进的可靠的顺序提取方法。(肛门。化学，51,844-851,1979)，在盆栽试验中，在土壤样品中加入一定量的铊，并在淹水条件下与水稻秧苗共培养4个月。用该方法从土壤中提取了5种不同的Tl组分，并用Asami等人的方法测定了Tl的含量。(费森尤斯·J·肛门)化学，356,348-351,1996)。初步研究表明，火焰原子吸收光谱法(FAAS)测定铊的检出限为0.2mg.MGCl1，−_2、CH3COONa和CH3COONH4萃取剂对可交换的铁锰氧化物结合组分的萃取有显著影响，而对弱酸溶组分、有机质结合组分和残渣组分的萃取影响不大。结果表明，土壤中Tl的化学行为以离子和配位性质为特征，土壤中可溶Tl主要与Fe-Mn氧化物结合。此外，本研究中的连续提取方法对测定的总铊的回收率在85%~101%之间。
Abstract To evaluate the existing forms of thallium in soils, a slightly modified and reliable procedure of sequential extraction was developed based on the method described by Tessier et al. (Anal. Chem., 51, 844–851, 1979) using samples of Andosols to which a certain amount of thallium was added and cultivated with rice seedlings during 4 months under water-logging conditions in a pot experiment. Five different thallium fractions extracted in soils by this procedure were identified and the amount of thallium was determined using the method of Asami et al. (Fresenius J. Anal. Chem., 356, 348–351, 1996). A preliminary study showed that the detection limit of the amount of thallium determined by flame atomic absorption spectrometry (FAAS) was 0.2 mg L−1, The MgCl2 , CH3COONa, and CH3COONH4 extractants exerted significant effects on the extraction of the thallium fractions that were exchangeable and bound to Fe-Mn oxides, but did not affect the extraction of the other thallium fractions, namely the weak acid-soluble fraction, the fraction bound to organic matter and the residual fraction. It was suggested that the chemical behavior of thallium in soils was characterized by ionic and coordination properties, and that soluble thallium added to soil was mainly bound to Fe-Mn oxides. Moreover, the sequential extraction procedure in the present study showed a good recovery ranging from 85 to 101% in relation to the total amount of thallium determined.