连云港市郊区菜田土壤和蔬菜铅含量研究

为了解连云港市效区菜田土壤和蔬菜铅污染状况,以市郊3个行政区域30个土壤样品以及对应的30个蔬菜样品为对象,分析土壤和蔬菜中铅含量情况,结果表明:33.3%的土壤样点铅含量超过国家土壤环境质量一级标准,土壤含铅量平均值为33.2 mg/kg,所测得铅含量最高的土壤样品含铅量为国家土壤环境质量一级标准的2.5倍,且变异程度较大,菜田土壤铅含量最大值(86.2 mg/kg)为最小值(13.3 mg/kg)的6.5倍;土壤铅污染主要集中在北部,主要原因是工业企业的三废排放;蔬菜铅含量超标比较严重,尤其是叶用莴苣和大白菜,超标率分别为40.0%和28.6%。

Study of Lead in Soil and Vegetables in Vegetable Field in Suburb of Lianyungang City

In order to understand the status of lead pollution of soil and vegetables in vegetable field in the suburbs of Lianyungang City,taking 30 soil samples and the corresponding 30 vegetable samples in three administrative regions as the object,the lead contents in soil and vegetable were analyzed,the results showed that:lead contents of 33.3% of the soil samples point exceeded the primary standard of national soil environmental quality,average lead content in soil was 33.2 mg/kg,the highest lead content in soil samples was 2.5 times for national soil environmental quality,and the degree of variation was larger,the maximum value of lead content in soil samples(86.2 mg/kg)was 6.5 times for the minimum value(13.3 mg/kg).Lead pollution in soil mainly concentrated in the northern part of the city,main reason was the emission of industrial wastes.Lead content of vegetables exceeded national soil environmental quality seriously,especially lettuce and Chinese cabbage,the exceeding rates were 40.0% and 28.6% respectively.