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用南方第四纪红色粘土发育的红壤性水稻土和花岗岩发育的乌沙土的耕层土样进行了淹水培育并测定其pH、Eh,可溶性锌和S~(2-)离子量。结果表明,随着还原条件的发展,pH和S~(2-)离子浓度上升,Eh和可溶态锌量下降,出现S~(2-)离子与Zn~(2+)离子形应ZnS的条件。根据实验数据计算,PZn~(2+)+pS~(2-)=22.8-25.17,与理论值相接近。因此,南方酸性水稻土在淹水还原条件下,当多量的硫酸盐被还原成S~(2-)离子时,有可能产生ZnS沉淀,并成为控制Zn(2+)离子固液相平衡中的一个重要因素。
The soil samples of paddy soil derived from the red soil paddy developed in the Quaternary red clay in southern China and granitic sandy soil were flooded and the contents of pH, Eh, soluble zinc and S ~ (2-) ions were determined. The results showed that with the development of reducing conditions, the concentration of pH and S 2 - ions increased, the amount of Eh and soluble zinc decreased, and the appearance of S 2 - ions and Zn 2+ ions should be ZnS conditions of. According to the experimental data, PZn ~ (2 +) + pS ~ (2 -) = 22.8-25.17, close to the theoretical value. Therefore, under the conditions of flooding and reducing, a large amount of sulfates are reduced to S 2- ions in the southern acidic paddy soils, which may cause ZnS precipitation and become the key to control the equilibrium of Zn 2+ ions in the solid-liquid phase An important factor.