珠江三角洲潜在生态风险:土壤重金属活化

Potential ecological risk assessment of heavy metal in soils in the Zhujiang River delta: Heavy metal activation in soils

摘要: 珠江三角洲典型土壤模拟酸雨提取实验表明,土壤酸缓冲能力为菜园土大于水稻土大于赤红壤。酸化过程早期,铝铁胶体吸附共沉淀导致重金属溶出量增长不明显甚至下降;进一步酸化时,多数元素溶出量与加入酸量呈显著正相关。计算表明,在pH=4.5的酸雨作用下,溶液中Hg、Mn、Pb、Fe(以Fe2O3表示)浓度已超出II级地表水标准,Cu、Zn大大高于渔业用水标准。可见,土壤元素活化溶出对水体生态环境有潜在的危害。

Abstract: Modeling experiments of extraction of acid rain from typical soils in the Zhujiang River delta indicate that the acid buffer capacities of three types of soil decrease in order of orthic anthrosols, stagnic anthrosols and udic ferralisols. At the beginnin