| 水稻土团聚体Cu2+吸附过程中铝的溶出及土壤溶液pH变化 |
| 摘要点击 1766 全文点击 984 投稿时间：2013-04-16 修订日期：2013-06-02 |
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| 中文关键词 团聚体 Cu2+ 吸附 铝溶出 pH |
| 英文关键词 aggregates copper sorption aluminum dissolution pH |
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| 中文摘要 |
| 采用低能量超声波分散和冷冻机干燥法提取太湖地区水稻土（黄泥土）不同粒径团聚体颗粒，用平衡吸附法研究团聚体对重金属Cu2+吸附过程中铝的溶出及土壤溶液pH变化，以及不同pH的Cu2+溶液中铝的溶出量的变化. 结果表明，团聚体对Cu2+的吸附过程，发生铝的溶出和土壤溶液pH下降，溶出量和pH下降幅度随Cu2+吸附量增加而增加，相同条件下铝溶出量和pH下降幅度大小顺序为：粗粉砂级>粉砂级>砂粒级>黏粒级，与氧化铁和有机质含量大小顺序相反. Cu2+溶液pH下降，铝的溶出量增加显著. 氧化铁和有机质对Cu2+吸附过程铝的溶出和土壤溶液pH下降具有一定的抑制和缓冲作用. |
| 英文摘要 |
| Size fractions of soil aggregates in Lake Tai region were collected by the low-energy ultrasonic dispersion and the freeze-desiccation methods. The dissolution of aluminum and changes of pH in soil solution during sorption of Cu2+ and changes of the dissolution of aluminum at different pH in the solution of Cu2+ by aggregates were studied by the equilibrium sorption method. The results showed that in the process of Cu2+sorption by aggregates, the aluminum was dissoluted and the pH decreased. The elution amount of aluminum and the decrease of pH changed with the sorption of Cu2+, both increasing with the increase of Cu2+ sorption. Under the same conditions, the dissolution of aluminum and the decrease of pH were in the order of coarse silt fraction>silt fraction>sand fraction>clay fraction, which was negatively correlated with the amount of iron oxide, aluminum and organic matter. It suggested that iron oxide, aluminum and organic matters had inhibitory and buffering effect on the aluminum dissolution and the decrease of pH during the sorption of Cu2+. |
