Adsorption of arsenate on soils. Part 2: modeling the relationship between adsorption capacity and soil physiochemical properties using 16 Chinese soils.
An attempt has been made to elucidate the effects of soil properties on arsenate adsorption by modeling the relationships between adsorption capacity and the properties of 16 Chinese soils. The model produced was validated against three Australian and three American soils. The results showed that nearly 93.8% of the variability in arsenate adsorption on the low-energy surface could be described by citrate-dithionite extractable Fe (Fe(CD)), clay content, organic matter content (OM) and dissolved organic carbon (DOC); nearly 87.6% of the variability in arsenate adsorption on the high-energy surface could be described by Fe(CD), DOC and total arsenic in soils. Fe(CD) exhibited the most important positive influence on arsenate adsorption. Oxalate extractable Al (Al(OX)), citrate-dithionite extractable Al (Al(CD)), extractable P and soil pH appeared relatively unimportant for adsorption of arsenate by soils.
Jiang
Wei
W
State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, P.O. Box 2871, Beijing 100085, China.
Zhang
Shuzhen
S
Shan
Xiao-Quan
XQ
Feng
Muhua
M
Zhu
Yong-Guan
YG
McLaren
Ron G
RG
D000327:Adsorption; D000535:Aluminum; D000538:Aluminum Silicates; D001149:Arsenates / Q000737:chemistry*; D001315:Australia; D002244:Carbon; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D000077215:Clay; D006812:Humic Substances; D006863:Hydrogen-Ion Concentration; D007501:Iron; D008962:Models, Theoretical; D012987:Soil; D012989:Soil Pollutants; D014481:United States
D000538:Aluminum Silicates; D001149:Arsenates; D006812:Humic Substances; D012987:Soil; D012989:Soil Pollutants; D002244:Carbon; D000535:Aluminum; D007501:Iron; C025657:arsenic acid; D000077215:Clay