白银市郊区农田土壤重金属污染初步调查与评价

文章采集了白银市区正东、东南、正南、西南、正西、西北、正北和东北等周边8个方向上的农田土壤,采用四酸消解法处理样品,利用电感耦合等离子体发射光谱法测定了土壤样品中的Cu、Hg、As、Cd、Cr、Ni、Pb和Zn等重金属的浓度水平,采用国标GB15618-1995二级标准、单因子指数法和內梅罗指数法对污染状况进行了初步评价?峁砻鳎滓星寥谰胁煌潭鹊闹亟鹗粑廴荆纫?Cu、As和Cd为重,其最高单因子指数分别达到了6.6、24和165;通过运用內梅罗污染指数法计算出白银市郊区农田土壤环境综合质量指数I=90.9,表明该地区农田土壤重金属已处于严重污染状态。

Preliminary Investigation and Assessment of Farmland Soils Contaminated by Heavy Metal around Baiyin City

Farmland soils were sampled in the east,southeast,south,southwest,west,northwest,north and northeast around Baiyan City,Ningxia Autonomous Region.The samples were pretreated by acid digestion and amounts of Cd,Hg,As,Cu,Pb,Cr,Zn and Ni were analyzed by ICP method respectively.The soil contaminations by heavy metals were initially assessed on the basis of national standard GB15618-1995 with single factor index and Nemerow pollution index method.It was found that farmland soils around the City were contaminated by heavy metals,especially by Cu,As and Cd,with single factor index numbers even as 6.6,24 and 165.Soil environment quality index was calculated as 90.9 by Nemerow pollution index method,which indicated that serious heavy metal contamination occurred in farmland soils around the City.