天津东丽区大毕庄土壤重金属污染综合评价

Comprehensive Evaluation on Heavy Metal Pollution in Soil of Dabizhuang in Dongli District of Tianjin

[目的]测定天津市东丽区大毕庄土壤重金属含量,并对重金属污染状况进行综合评价。[方法]研究大毕庄工厂污染区、污灌区和背景对比区8种污染元素(Cd、Hg、As、Pb、Cr、Cu、Zn、Ni)的含量,对重金属含量与采样点的关系进行分析,并对重金属污染状况进行总体评价。[结果]重金属在土壤中已有一定程度的积累,普遍超过当地背景值。工厂污染区污染最严重,有6种元素超标,综合评价为严重污染,污灌区有4种元素超标,综合评价为重污染,远离污染源的背景区全部达标,未被污染。[结论]大毕庄主要污染源为工厂粉尘和污水灌溉,并已对农田造成较严重的污染,为大毕庄土地规划和整治提供科学依据。

[Objective] The aim is to detect the heavy metals content in the soil of Dabizhuang and evaluate its pollution.[Method] The contents of Cd,Hg,As,Pb,Cr,Cu,Zn and Ni in factory pollution area,sewage water irrigation area and background area were investigated,whose relationship with the sample area was analyzed subsequently.At last,the metal pollution in Dabizhuang was evaluated comprehensively.[Result] The heavy metals in soil have accumulated to a certain extent exceeding the background values.The factory pollution area is most seriously polluted,with six kinds of heavy metals＇ contents over the national standard;the sewage water irrigation area is also heavily polluted with four kinds of heavy metals over the standard.The background areas have not been polluted.[Conclusion] This research shows that the factory dust and wastewater irrigation is the main sources of pollution,which has already caused serious farmland pollution.This study provides a feasible scientific basis for later land planning and land reclamation for Dabizhuang.