模拟酸雨对土壤中Zn的释放与缓冲作用研究

Study on the emissions and buffer mechanism of zinc in the soil with simulated acid rain

研究了模拟酸雨淋溶过程中南方主要土壤锌释放量与缓冲机理。结果表明,土壤中存在两个缓冲体系,pH值高于3.0时,土壤以初级缓冲体系为主;pH值低于3.0,尤其是离子淋溶量高于或接近CEC值后,次级缓冲体系成为主要的质子缓冲源。淋溶液pH值的降低可加速Zn的释放,从而促进土壤中Zn的淋溶,但Zn的淋溶同时受到吸附、沉淀与转化过程及土壤初始条件的影响。

Studied simulated acid rain leaching process with the South Main soil zinc emissions buffer mechanisms. The results showed that the existence of two soil buffer system, pH values higher than 3, Soil mainly to the primary buffer system ; PH values below 3.0. Especially ion leaching value of more than or close to the CEC, the secondary buffer system as a major source of proton buffer. Drip solution of the pH value can be accelerated to reduce the release of Zn, thereby promoting the leaching Zn soil, but also by adsorption Zn the leaching sedimentation and transformation process and the initial soll conditions.