模拟酸雨作用下红壤镉释放的研究

 采用室内模拟酸雨淋溶土柱的方法,研究了酸雨影响下4种红壤镉的释放特征.结果表明,酸雨加速了红壤中镉的淋溶损失,其对红壤镉释放的影响表现在两个方面,在同一酸度的淋溶液作用下,镉释放量一般随淋溶量的增加而增加;在同样强度的淋溶量下,淋溶液的pH值越低,镉的释放量越大.镉累积释放量与淋溶量的关系可用一元二次方程描述.酸雨增加了水体中镉的负荷,从而加重了镉对环境的危害.

Studies on the character and rule of cadmium release from red soils under the action of acid rain

Adopting the technique of acid rain soil leaching column simulated in doors to study the character and rule of cadmium release from four kinds of red soils under the influence by acid rain. Acid rain accelerated the release loss of cadmium in red soils; its influence of cadmium release from red soils was demonstrated in two aspects. Under the action of same acidic leaching liquor, the release amount of cadmium increased generally with the increase of the leaching amount and under the leaching amount of same strength, the lower the pH values of the leaching liquor, the more the release of cadmium. The relation between the cumulative release amount of cadmium with the leaching amount could be described with mono basic quadratic equation. The influence of acid rain on the release of cadmium could increase the cadmium load in the waters, thus heightening the harm to environment.