Mobilization of soil-borne arsenic by three common organic acids: Dosage and time effects

Chemosphere
Olaronke O Onireti, Chuxia Lin

Abstract

A batch experiment was conducted to investigate the mobilization of soil-borne arsenic by three common low-molecular-weight organic acids with a focus on dosage and time effects. The results show that oxalic acid behaved differently from citric acid and malic acid in terms of mobilizing As that was bound to iron compounds. At an equivalent molar concentration, reactions between oxalic acid and soil-borne Fe were kinetically more favourable, as compared to those between either citric acid or malic acid and the soil-borne Fe. It was found that reductive dissolution of soil-borne Fe played a more important role in liberating As, as compared to non-reductive reactions. Prior to the 7th day of the experiment, As mobility increased with increasing dose of oxalic acid while there was no significant difference (P > 0.05) in mobilized As among the treatments with different doses of citric acid or malic acid. The dosage effect on soil-borne As mobilization in the citric acid and malic acid treatments became clear only after the 7th day of the experiment. Soluble Ca present in the soils could cause re-immobilization of As by competing with solution-borne Fe for available organic ligands to form practically insoluble organic compounds of c...Continue Reading

References

Mar 14, 2007·Research in Microbiology·Steven L DanielHarold L Drake
Dec 30, 2014·Journal of Hazardous Materials·Miriam Mukwaturi, Chuxia Lin

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Citations

May 10, 2017·International Journal of Phytoremediation·Jun YangShu-Qing Liu
Jul 20, 2019·Environmental Science and Pollution Research International·Giovanni GarauPaola Castaldi
Dec 10, 2017·Environmental Science and Pollution Research International·Stefania DiquattroPaola Castaldi
Mar 13, 2020·Environmental Pollution·Matheus Sampaio C BarretoLuís Reynaldo F Alleoni
Aug 12, 2020·Journal of Environmental Management·Junhao QinChuxia Lin

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