土壤中可变电荷表面磷的解吸特性
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DESORPTION CHARACTERISTICS OF PHOSPHATE ON VARIABLE-CHARGE SURFACE IN SOILS
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    摘要:

    本文研究了土壤中可变电荷表面磷的解吸特性。结果表明,磷解吸量与吸附量成正相关,并与直线方程和指数方程拟合。其平均解吸百分数依次为:高岭石(66%)>无定形硅酸铝(60%)>砖红壤粘粒(55%)>>无定形氧化铁(29%)>三水铝石(23%)>>火山灰粘粒(9%)。解吸体系的pH是借对磷酸根质子的解离和表面电荷的影响而制约解吸量。F-和OH-离子对磷酸盐化的三水铝石连续解吸的结果表明,磷酸根和氟离子在三水铝石表面的吸附量或剩余量之和均较为接近,这揭示了H2PO4-和F-离子之间既竞争又相互补充表面空位。它可作为一种区分磷吸附形态和沉淀的定量方法来进一步研究。

    Abstract:

    The desorption of phosphate determines the transformation and translocation of phosphorus in soils,and affects the P nutrition of soils and the environmental effect of phosphorus.Accordingly,it is of great importance to study the desorption characteristics of phosphate.In she present study laterite (L),volcanic ash soil (V),kaolinite (K1) and synthetic amorphous aluminum silicate (AAl-si),amorphous iron oxide (AFe)and gibbsite (G) were used to investigate the desorption characteristics of phosphate on the variable-charge surface in soils.The results showed that the phosphate desorbed by 0.01 mo1L-1 NaF (pH 9.08) was determined by phosphate adsorbed previously,and the relationship between them could be well described by using linear and exponential equations.The average desorption percentages were shown as follows: Kl(66%)>AAl-si;(60%)>L(55%);AFe(29%)>G(23%)>>V(9%).The variatton degree of desorption percentage was related to the constituents of samples.The phosphate desorption was determined by the pH of desorption solution which could affect the proton dissociation of phosphate and the surface charges of colloids.The phosphate desorption increased consistently with the initial pH(pHi) of desorbent except that for the kaolinite and gibbsite it decreased at first and then increased.The p1H of equilibrium desorption solution (pHe) firstly showed an to crease and then followed by a decrease.When the ΔpH,the difference of pHe and pHi,was equal to zero,the pH of desorption solution was affected by the surface characteristics of minerals.The critical pH for the samples was V(7.7)>AAl-Si>(6.9)>L(6.8)>AFe(6.%)>Kl(6.1)>G(4.2).

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王建林,陈家坊.土壤中可变电荷表面磷的解吸特性[J].土壤学报,1991,28(1):14-23. Wang Jianlin, Chen Jiafang. DESORPTION CHARACTERISTICS OF PHOSPHATE ON VARIABLE-CHARGE SURFACE IN SOILS[J]. Acta Pedologica Sinica,1991,28(1):14-23.

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  • 在线发布日期: 2013-02-25
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