高强度模拟酸雨量对珠三角地区潮土中重金属元素释放的影响
Influence of High Intensity Simulated Acid Rain on Heavy Metal Element Release from Moisture Soils in Pearl River Delta
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摘要: 采用平均离子强度下30年雨量的模拟酸雨淋滤珠江三角洲潮土，电感耦合等离子体质谱法测定重金属元素，研究潮土0～90 cm处各节土壤柱中重金属镉、钴、铜、锌、铅、砷、钛、钒、铬、锰等元素的释放情况。研究表明，在高强度模拟酸雨淋滤下，潮土中重金属元素的释放情况存在较大差异。长期的酸雨淋滤，土壤中的镉、钴、铜、锌和铅在不同深度均有不同程度的淋失；砷、钛、钒、铬、锰等元素不会造成大量的淋失。利用这种差异可以评估重金属元素对环境的潜在影响，为农田生态系统的预警预测提供依据。Abstract: This article studied the influence of high intensity simulated acid rain (average of 30 years rainfall in this area) on releasing of some heavy metal elements such as Cd, Co, Cu, Zn, Pb, As, Ti, V, Cr and Mn from moisture soil in Pearl River Delta. Inductively coupled plasmamass spectrometry (ICP-MS) was used for the determination of heavy metal elements leached from the moisture soil by high intensity simulated acid rain. The study showed that the releasing behaviours of these heavy metal elements in moisture soil were different. Under the longterm acid rain leaching, Cd, Co, Cu, Zn and Pb were washed away in varying degrees at different soil depths, but without much lose of As, Ti, V, Cr and Mn. These differences can help us to evaluate the potential impact of the heavy metal elements on the environment and provide a basis of early warning and prediction for agro-ecosystem.
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