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黄泥土中胡敏酸对芘的吸附及作用机理研究

Keywords: 胡敏酸,,非线性吸附,元素分析,FTIR图谱

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Abstract:

采用高效液相色谱法测定了3种不同利用方式下黄泥土中胡敏酸对芘的吸附效应,并利用元素分析、FTIR图谱分析对其吸附机理进行研究。吸附试验表明,桑园、水田、水杉土壤中胡敏酸对芘的吸附在低浓度范围近似线性,而浓度较高时,吸附曲线的非线性增强,三者呈相似的非线性吸附。不同利用方式下黄泥土中胡敏酸对芘的吸附等温线用Freundlich等温方程拟合效果很好,均达到显著相关。元素分析与FTIR图谱分析结果表明,10年时间的不同利用方式对土壤中胡敏酸元素组成影响较小;桑园、水田、水杉土壤中胡敏酸对芘的吸附分配系数有一定差别,推测脂肪族类物质对吸附起着重要的影响。由胡敏酸吸附前后的FTIR图谱变化主要集中在3400、2920cm-1附近,进一步推出两者结合机制是胡敏酸中脂肪族类物质作用的结果。

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