Adsorption of arsenate on soils. Part 1: laboratory batch experiments using 16 Chinese soils with different physiochemical properties.
Laboratory batch experiments were carried out to study the adsorption of arsenate on 16 Chinese soils with different physicochemical properties. Wide differences in arsenate adsorption were observed, and the Jiangxi and Hubei soils were more effective sorbents for arsenate than other soils. The Langmuir one-surface and two-surface equations were used to model the arsenate adsorption data. Except for the Jiangxi and Hubei soils, the Langmuir one-surface equation gave reasonably good fits to the arsenate adsorption data. However, the Langmuir two-surface equation generally provided a better fit than the Langmuir one-surface equation. For soils with relative high organic matter (OM), dissolved organic carbon (DOC) or extractable phosphate, the Langmuir one-surface and two-surface equations described the adsorption isotherms similarly. In contrast, for soils with relatively low contents of OM, DOC or extractable phosphate, the Langmuir two-surface equation gave the better fit to the arsenate adsorption data.
Jiang
Wei
W
State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
Zhang
Shuzhen
S
Shan
Xiao-Quan
XQ
Feng
Muhua
M
Zhu
Yong-Guan
YG
McLaren
Ron G
RG
D000327:Adsorption; D001149:Arsenates / Q000737:chemistry*; D002244:Carbon; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D002681:China; D004784:Environmental Monitoring / Q000379:methods; D006540:Herbicides / Q000737:chemistry*; D006812:Humic Substances; D006863:Hydrogen-Ion Concentration; D008962:Models, Theoretical; D010710:Phosphates; D012987:Soil; D012989:Soil Pollutants
D001149:Arsenates; D006540:Herbicides; D006812:Humic Substances; D010710:Phosphates; D012987:Soil; D012989:Soil Pollutants; D002244:Carbon; C025657:arsenic acid