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| Effects of pH and Phosphate on Se（Ⅳ） Adsorption by Tea Garden Soil |
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| KeyWord:tea garden soil; Se（Ⅳ）; pH; phosphorus-selenium interaction; adsorption behavior |
| Author Name | Affiliation | | YAN Jia | College of Resources and Environmental Sciences in Nanjing Agricultural University, Nanjing 210095, China | | ZONG Liang-gang | College of Resources and Environmental Sciences in Nanjing Agricultural University, Nanjing 210095, China | | YANG Ni | College of Resources and Environmental Sciences in Nanjing Agricultural University, Nanjing 210095, China | | YAO Huan | College of Resources and Environmental Sciences in Nanjing Agricultural University, Nanjing 210095, China | | MA Ai-jun | Jiangsu Polytechnic College of Agriculture and Forestry, Jurong 212400, China | | HE Ren-hong | Jiangsu Polytechnic College of Agriculture and Forestry, Jurong 212400, China |
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| Abstract: |
| Chemical behaviors of Se in soils influence Se availability to plants. The effects of pH and phosphate on Se（Ⅳ） adsorption by tea garden soil were investigated. The results showed that the time required to achieve adsorption equilibrium of Se（Ⅳ） did not show differences when pH values increased from 3 to 7. Adsorption capacity of Se（Ⅳ） was higher at pH 3 than at pH 5 and pH 7. No significant differences in adsorption were found between pH 5 and pH 7. The presence of phosphate not only increased the time for Se（Ⅳ） to reach adsorption equilibrium, but also remarkably decreased the Se（Ⅳ） adsorption. Adsorption kinetics of Se（Ⅳ） followed Elovich and double-constant equations, while adsorption isotherms could be explained by Langmuir, Freundlich, and Temkin models. The effects of P on Se（Ⅳ） adsorption were affected by P/Se molar ratios and addition sequences. At P/Se molar ratio>1, Se（Ⅳ） adsorption decreased significantly. Adsorption of Se（Ⅳ） was in order of Se addition prior to P>Se and P together>P prior to Se. These findings could provide useful information for enhancing plant availability of Se in tea garden soil. |
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