Plant Soil Environ., 2012, 58(9):405-411 | DOI: 10.17221/200/2012-PSE

Phosphate has a differential influence on arsenate adsorption by soils with different properties

X. Zeng1, P. Wu1,2, S. Su1, L. Bai1, Q. Feng1
1 Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences/Key Laboratory of Agro-Environment, Ministry of Agriculture, Beijing, P.R. China
2 Institute of Research for Soil and Fertilizer, Anhui Academy of Agricultural Sciences,

The adverse effect of the application of phosphorus (P) on arsenic (As) adsorption by soils can result in increasing mobility and availability of As. However, in different soils, P might influence As adsorption differently. In this study, the arsenate [As(V)] adsorption capacities of six soils with different properties and the effects of P application were studied. The results indicated that the adsorbed As(V) contents all increased as a function of the As(V) content in equilibrium. When analysed using the Langmuir and Freundlich equations, the maximum As(V) adsorption capacity of 0.72 mg/g was found for an Alumi-Plinthic Acrisol, while the minimum capacity of 0.09 mg/g was observed for an Epigleyic Cambisol. The adverse effects of P application on As(V) adsorption by the six soils were observed to be variable. When the P/As molar ratio in a culture experiment was increased from 0 to 10, the maximal and minimal decreases in the As(V) adsorption capacity of 0.086 and 0.014 mg/g were found in the Alumi-Plinthic Acrisol and Epigleyic Cambisol, respectively. P was relatively more effective in competing for adsorption sites with As(V) in the Alumi-Plinthic Acrisol and Luvi-Endogleyic Phaeozem due to their higher A/P values (decrease in adsorbedAs/added P) of 1.143 and 1.135, respectively. These results will help decrease the environmental risk of some As-contaminated agricultural soils through the controlled application of P.

Keywords: isothermal equation; adsorption capacity; P, As molar ratio; As availability

Published: September 30, 2012  Show citation

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Zeng X, Wu P, Su S, Bai L, Feng Q. Phosphate has a differential influence on arsenate adsorption by soils with different properties. Plant Soil Environ. 2012;58(9):405-411. doi: 10.17221/200/2012-PSE.
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