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亚热带深水库沉积物-水界面磷释放受控因子的研究

Keywords: 沉积物-水界面,磷释放,山仔水库,福建省

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Abstract:

山仔水库是福建省福州市160万人口的第二饮用水源地,沉积物磷的释放影响着水库的水质。采用SMT法分析了山仔水库表层沉积物总磷含量在641.5~982.7kg·kg-1之间,铁/铝结合态磷和有机磷是沉积物磷的主要赋存形态,占总磷含量的70%~85%左右。采用正交实验,探讨了山仔水库3个不同断面沉积物-水界面磷释放的受控因素。结果表明,pH值对磷释放速率的影响最大,其次是溶解氧多少和温度的高低。碱性条件下沉积物释放磷强度大,厌氧条件下有利于沉积物中磷的释放,随着温度的升高,沉积物中磷的释放强度随之增大。从空间上看,各断面磷释放速率的差异不明显。本研究可为该水库内源污染的防治提供参考。

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