• ISSN 1008-505X
  • CN 11-3996/S

几种铵盐对土壤吸附Cd2+和Zn2+的影响

Effects of NH4+ salts on sorption of Cd2+ and Zn2+ in soils

    摘要
  • 摘要: 采用平衡吸附法，研究了不同铵盐对潮褐土、红壤吸附Cd2+、Zn2+的影响。结果表明，土壤对Cd2+、Zn2+的吸附量随平衡溶液中Cd2+、Zn2+浓度的增加而增加；潮褐土和红壤对Cd2+、Zn2+的最大吸附量为：Zn2+ Cd2+，且潮褐土红壤；随NH4HCO3浓度的增加，两种土壤对Cd2+、Zn2+的吸附率显著提高，NH4Cl、NH4NO3和(NH4)2SO4抑制红壤对Cd2+、Zn2+的吸附及潮褐土对Cd2+的吸附，对潮褐土Zn2+的吸附率影响不显著；铵盐浓度相同时，红壤对Cd2+吸附率为：NH4HCO3NH4ClNH4NO3≈ (NH4)2SO4，红壤对Zn2+吸附率为：NH4HCO3NH4Cl NH4NO3(NH4)2SO4。

     

    Abstract: The effects of different NH4+ salts on Cd2+ and Zn2+ sorption in meadow cinnamon soils (MCS) and red soils (RS) were evaluated by batch method. The results showed that Cd2+ and Zn2+ amounts adsorbed by soils increased with the initial concentrations of added Cd2+ and Zn2+. The maximum amount of Cd2+ and Zn2+ sorption on MCS and RS were: Zn2+ Cd2+. The maximum amount of heavy metal ions adsorbed on soils was greater in meadow cinnamon soil than in red soil. The sorption percentage of Cd2+ and Zn2+ by soils decreased in the presence of NH4HCO3. NH4+ salts, such as NH4Cl, NH4NO3, and (NH4)2SO4 restrained Cd2+ and Zn2+ sorption in RS and Cd2+ sorption in MCS. There was no significant effect of NH4Cl, NH4NO3, and (NH4)2SO4 on Zn2+ sorption in MCS. At the same concentration of NH4+ salts, Cd2+ sorption percentage in RS was decreased in the following order: NH4HCO3NH4ClNH4NO3≈(NH4)2SO4, and Zn2+ sorption percentage in RS in the following order: NH4HCO3NH4ClNH4NO3(NH4)2SO4.

     

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