Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/71592
標題: Effect of water extract of compost on the adsorption of arsenate by two calcareous soils
作者: Lin, H.T.
Wang, M.C.
Li, G.C.
關鍵字: adsorption
anion
arsenate
dissolved organic carbon
water extract of
compost
arsenite sorption
chemistry
phosphate
arsenic(iii)
ferrihydrite
environment
phosphorus
desorption
molybdate
goethite
期刊/報告no:: Water Air and Soil Pollution, Volume 138, Issue 1-4, Page(s) 359-374.
摘要: The increasing mobility of arsenate will increase its leaching potential to groundwater and uptake by plants. The mobility of arsenate in soils is related to the competitive adsorption with other substances. The effect of organic substances on the adsorption of arsenate by soils was evaluated using the water extract of compost (WEC) as a complex anion source in a batch experiment. Two calcareous slate alluvial soils, Chiwulan and Shuipientou, with higher arsenic contents of 23.7 and 12.9 mg kg(-1), respectively, were used. The Langmuir equation has been used to describe successfully the As adsorption isotherm for the two soils. The maximum adsorption of As was 6.098 and 4.785 mumol g(-1) for Chiwulan and Shuipientou soils, respectively. There was competitive adsorption for binding sites on the soils between arsenate oxyanions and organic anions derived from the dissolved organic carbon (DOC) of WEC. Different critical pH values were for arsenate addition related to arsenate adsorption on both soils in the absence of DOC of WEC but not in the presence of DOC of WEC. The soil properties related to arsenate adsorption by the two soils may govern the critical pH values.
URI: http://hdl.handle.net/11455/71592
ISSN: 0049-6979
文章連結: http://dx.doi.org/10.1023/a:1015534302225
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