期刊
MICROCHIMICA ACTA
卷 159, 期 1-2, 页码 175-182出版社
SPRINGER WIEN
DOI: 10.1007/s00604-006-0709-4
关键词
arsenic speciation; microwave-assisted extraction; soil and ore
Three extraction systems including shaking, ultrasonic and microwave-assisted extraction were evaluated. Water and phosphate buffer were tested for the extraction of arsenic compounds in polluted soil, describing the water-soluble or plant-available fraction. The stabilities and recoveries of various arsenic species indicated that no obvious changes of species occurred during the extraction process. The raw extracts were cleaned up by C-18 cartridge before analysis. Having optimized the extraction conditions, the arsenic species in polluted soil and ore from the different pollution sources were extracted by microwave-assisted extraction with 0.5 M phosphate buffer as extractant. Arsenic species were quantitatively determined by high performance liquid chromatography on-line coupled with hydride generation atomic fluorescence spectrometry (HPLC-HG-AFS). As(III) and As(V) were the major arsenic species in the polluted soil samples resulting from irrigation by waste water. As-V was the only form found in the rotten ore sampled in mining area. During the extraction process, the recoveries of spiked As(III), As(V), DMA(V) and MMA(V) were 85.4 +/- 7.2%, 80.2 +/- 6.7%, 101.6 +/- 6.7% and 98.8 +/- 9.1%, respectively, showing that most water-soluble arsenic could be measured.
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