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环境化学  2015 

苏柳172和垂柳对Pb的吸收动力学特性及有机酸的影响

Keywords: 铅,柳树,吸收动力学,有机酸

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Abstract:

采用溶液培养的方法研究了苏柳172(SalixjiangsuensisCL‘J172’)和垂柳(SalixbabylonicaLinn)的Pb吸收动力学、Pb在根区的分布以及低分子量有机酸对Pb吸收的影响.结果表明,在溶液Pb浓度为0.25-100μmol·L-1时,两种柳树对Pb的吸收动力学都呈非饱和曲线,积累量随浓度的增大及时间的延长而增加.垂柳根的吸收力α(Vmax/km)值0.99L·g-1·h-1明显高于苏柳172根的α值0.16L·g-1·h-1,在溶液中Pb浓度为20μmol·L-1时,垂柳的Pb吸收量在120min和48h时均为苏柳172的1.4倍,因此,垂柳对Pb的吸收积累能力强于苏柳172.柳树根尖区的Pb含量远远大于成熟区,根尖区是吸收Pb最活跃的区域.一定摩尔浓度配比的乙酸和苹果酸可以促进Pb的吸收,苹果酸和乙酸与Pb摩尔浓度配比为10∶1时,苏柳172的Pb吸收量是对照的2.39倍和1.54倍,苹果酸和乙酸与Pb摩尔浓度配比为5∶1时,垂柳的Pb吸收量是对照的1.48和1.34倍.施加高浓度苹果酸未促进铅向地上部的运输.

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