南通地区部分河域经济水产品中重金属含量的检测及评价

Detection and Evaluation of heavy Metals in the river food from part rivers of Nantong

为了解我市水体中水产品的重金属含量 ,采集了本市污染相对较重河流 (以下简称II区 )的部分河流中的田螺 (snail)、河蚌 (mussel)、喇蛄 (俗称龙虾 ) (crawfish)并进行了抽样检测 ,同时收集污染相对较轻的河流 (以下简称I区 )中相应产品作为对照 ,共查 3种 96件样品 ,两区每种样品均为 16件。I、Ⅱ区河流铅含量 :田螺各有 4份超标 ,超标率各为 2 5 .0 0 % ,龙虾、河蚌中未超标 ;镉含量 :Ⅱ区龙虾超标 14件 ,超标率达 87.5 0 % ,河蚌超标率为 2 5 .0 0 % ,田螺超标率为6.2 5 % ;I区龙虾超标 12件 ,超标率为 75 .0 0 % ,两地三种水产品的超标率均有显著差异 (P分别均为 0 .0 0 1和 0 .0 0 1)。砷含量 :区龙虾、河蚌、田螺的超标率分别为 10 0 .0 0 %、87.5 0 %、62 .5 0 % ;I区分别为 5 0 .0 0 %、0 .0 0 % 12 .5 0 %。汞含量 :两地三种水产品均未超标。检测结果说明我市河流已受到一定程度的重金属污染 ,以砷、镉为重。调查结果说明需进一步加强对本市水污染的防治。

To assess contents of heavy metals in the river food from the part river in Nantong city.Ninety-six river food cases were selected from the heavier polluted place (Ⅱ area) and the lighter polluted place (I area). The results show, Pb: four snail cases are out of the maximum permission level in two areas, the unqualified rate is 25.00%. Cd: in Ⅱarea, fourteen crawfish cases are out of the maximum permission level, and the unqualified rates of crawfish,mussel and snail are 87.50%,25.00% and 6.25% respectively. In I area, twelve crawfish cases are out of the maximum permission level, the unqualified rate is 75.00%, the unqualified rates are quite different in the river feed of two areas ( P <0.001). As: in Ⅱ area, the unqualified rates are 100.00%, 87.50% and 62.50% in crawfish, mussel and snail, in I area, are 50.00%, 0.00%, 12.50% respectively. Hg: all river feed are qualified. According to the results, we think that the river in the city has been polluted by heavy metals. Cd and As pollution are more serious than other metals.It is necessary to enhance prevention and cure of the pollution river.