酸雨条件下城市农业土壤镉的释放研究

本文选取成都市典型农业土壤为研究对象，根据成都市降雨特征，模拟一定范围pH及主要阴、阳离子浓度配制成母液开展酸雨淋滤实验，以确定酸雨中影响土壤重金属元素镉溶解度的关键因素，探明其对镉释放的影响程度。研究结果表明，总体上酸雨加速了土壤镉的释放。不同类型土壤在同一酸雨条件下，镉的释放速度和最大释放量也不同。酸雨pH值和主要阴、阳离子浓度对镉释放的影响有明显的规律。

Effect of Acid Rain on Cadmium Release of Farming Soil in a City

The typical fanning soils in Chengdu were sampled for research. According to the feature of rainwater such as pH, concentrations of anions and cations and so on, liquids were prepared to simulate acid rains for the leaching experiments to determine the crucial factors in acid rain affecting solubility of the heavy metal Cd iri soil. The results showed that, generally acid rain accelerates the release of soil Cd. Under the same conditions of acid rain, the release speed and maximum release content of Cd depended on the type of soil. There were evident effects of pH, concentrations of anions and cations of acid rain on the release of Cd from the soils.