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Thesis Name: Speciation analysis of trace-level arsenic and selenium in soil using ultrasonic slurry sampling hydride generation-double channel atomic fluorescence spectrometry
Usage: Chemistry
Keyword: Ultrasonic slurry sampling; Atomic fluorescence spectrometry; Soil; Arsenic; Selenium; Speciation an
Remarks: Abstract
Ultrasonic aided slurry sampling hydride generation atomic fluorescence spectrometry (USS–HG-AFS) was developed for the simultaneous determination of total As, As(III), total Se and Se(IV) in soil samples collected from a sewage-irrigated farm. 500 mg grounded soil was suspended in agar solution by an ultrasound water bath before the HG-AFS determination. The alternated mixing of the sample solution with thiourea and ascorbic acid or HCl for the determination of As or Se under optimized conditions was achieved before the reaction with KBH4. The addition of thiourea and ascorbic acid promoted the reduction of As (V) to As (III), thus enhancing sensitivity and precision. The pre-reduction of selenium from Se (VI) to Se (IV) was produced by heating the sample with HCl. The results for the reference material of soil (serial number GBW-07411) agreed satisfactorily with the certified values. Results obtained by the developed procedure compared well with those after traditional acid digestion of samples. The detection limit are 8.5, 10.5, 3.4 and 6.1 ng L-1 for total As, As(III), total Se and Se(IV) respectively, with average relative standard deviation values of 3.8, 4.2, 3.1 and 5.6% for analysis of a series of soil samples of different sample sites. The recoveries of the analytes varied in the range from 95 to 104%. This observation has stimulated the interest in developing fast, accurate and sensitive analytical methods for the determination of metal species in soil.


Author:
Liang Shuxuan, Lv Tianfeng1, Wen Chunhui, Sun Hanwen, Liu Aichang
Unit:College of Chemistry and Environmental Science, Hebei University, Key Laboratory of Analytical Science and Technology of Heibei Province, Baoding 071002;
China Metallurgy Perambulation Design Academe of limited company, Bao Ding, 071069, China
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