土壤对镉的吸附与解吸——Ⅰ.土壤组份对镉的吸附和解吸的影响
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ADSORPTION AND DESORPTION OF CADMIUM IN SOILS Ⅰ THE INFLUENCE OF SOIL COMPONENTS ON Cd ADSORPTION AND DESORPTION
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    摘要:

    采用选择溶解法研究了有机质、游离铁、无定型硅、铝等土壤组份对青黑土、黄棕壤、红壤和砖红壤胶体吸附和解吸Cd的影响。结果表明,去除有机质后胶体吸附Cd减少,这可能是由于交换吸附的减少所致;游离铁的去除使得黄棕壤、红壤和砖红壤的吸附量显著减少,显示了在这些土壤中游离氧化铁专性吸附的重要性;随着无定形铝含量的上升,吸附量下降,这是因为铝离子占据了高能量的吸附位。经不同处理后的土壤胶体,其Cd的解吸顺序(解吸%)大致为:去无定型硅、铝者>去游离铁者>去有机质者>原胶体,但在不同土壤和不同pH条件下该顺序略有差别。研究结果为控制和改造土壤Cd污染提供了理论依据。

    Abstract:

    Effect of organic matter, free iron oxide and amorphous Si and Al on the Cd adsorption and desorption of colloids of lime concretion black soil (IBC), yellow brown earth (YBC),red earth (RC) and latosol (LC), which are the typical soils in South and Southeast China,was studied with selective dissolution method. Results showed the decrease of Cd adsorption by colloids of the soils after removal of OM might be due to the decrease of exchangeable adsorption by the soil colloids. Removal of free Fe2O3 resulted in significant decrease of Cd adsorption by the colloids of YBC, RC and LC, which indicates the significance of specific adsorption of free iron oxide in these soils. Cd adsorption decreased with increasing of amorphous Al content in soil colloids, which might be due to the high energy exchange sites being occupied by Al ions.The Cd desorption percentage by the soil colloids after different treatmems was in the order: that removing amorphous Si, Al> that removing free Fe2O3>that removing OM>the original soil colloids, however, the order differed slightly for different soils under different pH.

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陈怀满.土壤对镉的吸附与解吸——Ⅰ.土壤组份对镉的吸附和解吸的影响[J].土壤学报,1988,25(1):66-74. Chen Huaiman. ADSORPTION AND DESORPTION OF CADMIUM IN SOILS Ⅰ THE INFLUENCE OF SOIL COMPONENTS ON Cd ADSORPTION AND DESORPTION[J]. Acta Pedologica Sinica,1988,25(1):66-74.

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  • 在线发布日期: 2013-02-25
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