作　　者： ; ; ;

机构地区： 广州大学环境科学与工程学院

出　　处： 《地学前缘》 2008年第6期342-349,共8页

摘　　要： 粤北大宝山铁多金属矿床的开发给环境带来了严重的危害。采选冶产生的酸性排水及固体废弃物堆积的淋滤酸水,携带浸滤出的大量重金属离子流入下游河道,严重影响矿区及酸水流域的生态环境。结果表明,河流水中高Pb含量直接源于尾砂,并受水体pH值的显著影响。河流底泥能够大量聚集水体中的Pb,在水体pH值降低时,相对稳定存在的Pb会被再次从河流底泥中释放出来,形成河流二次污染。土壤中Pb含量受土壤pH值和土壤粒度的影响,食用蔬菜中Pb的高含量由土壤Pb高含量决定,并受土壤pH值的影响,通过改善农业灌溉水质,提高土壤pH值,可以降低蔬菜重金属Pb含量。 Mining activities have caused severe soil environmental changes in Dabaoshan Mine,Guangdong provence,Southern China.The acid mine drainage and heavy metal ions drained directly into the Hengshihe river,which contaminated the ecological environment along the river severely.The tailings,soils,sludges,water and plants are regarded as a whole ecosystem,and the environmental responses of the whole ecosystem to the acid mine drainage and heavy metal ions were investigated.The high lead concentration in river water was caused by the tailings,and was affected distinctly by the pH value of the water.The river sludges can stably accumulate lead of water in high pH value water,but it could be released from the deposits when the pH value of water became low,which caused the secondary contamination.The lead concentration in soils is affected by the pH value and the granularity of soils.The high lead concentrations in plants is related to the total lead in soils,and affected by the pH value of soils;increasing soil pH value by improving irrigation water quality can reduce the lead concentrations in plants.

关 键 词： 铅 酸性排水 环境地球化学 大宝山矿

领　　域： [环境科学与工程]