【摘要】 粤北大宝山铁多金属矿床的开发给周围环境带来了严重的危害。采选产生的酸性废水携带浸滤出的重金属离子流入横石河,严重影响矿区及其下游的生态环境。从尾砂、水体、河流底泥、土壤以及食用蔬菜探讨整个环境系统对锌的环境响应。结果表明,河流水中高锌含量直接源于尾砂,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锌,在pH值高时,相对稳定存在,当水体pH值降低时,锌会被再次从河流底泥中释放出来,形成河流二次污染;土壤中锌含量和土壤pH值有良好正相关关系;食用蔬菜中锌的高含量受土壤的锌总量决定,并受土壤pH值的影响,通过改善农业用灌溉水质,可以降低蔬菜重金属含量。更多还原

【Abstract】 Activities on the iron polymetallic mine have caused severe impacts on the environment in Dabaoshan Mine in North Guangdong.The acid mine drainage and heavy metal ions drained directly into the Hengshihe River,which affected the ecological environment around the mine and downstream of the river severely.The environmental responses of whole ecosystem to zinc were investigated from the tailing,water body,bed sediments in the river,soil,and esculent vegetables.It showed that the high zinc concentration in river water came from the tailings and was affected distinctly by pH value of water.Bed sediments can accumulate a mass of zinc in water,which was stable under high pH value while it was released from the sediments under low pH value and formed secondary contamination.The zinc concentration in soils was positively related with pH value of soils.The high zinc concentration in vegetables was determined by the total zinc in soils and affected by pH value of the soil.The improvement of water quality for agricultural irrigation can help to reduce the content of heavy metals in vegetations.更多还原