海绵城市建设对土壤污染物的削减效应研究——以四川省遂宁市海绵城市试点建设区为例

Reduction Effect of Sponge City Construction on Soil Pollutants——Take Suining City as an Example

本文以全国首批海绵城市试点建设区--四川省遂宁市为研究对象,进行土壤重金属污染的跟踪调查研究,通过对比海绵城市建设前后7种常见土壤重金属Sn、Cu、Zn、Cd、Pb、As、Hg的ICP-MS法和原子荧光法检测结果,探究海绵城市建设对区内土壤重金属污染的削减情况以及各重金属离子表现出的敏感性。结果表明:建设完成后区内土壤重金属含量明显低于建设前,重金属污染程度降低且削减效应明显,典型海绵结构的生物修复净化功能和渗透排水功能使得土壤中的重金属污染物含量减少;同时所检测的7种常见重金属Sn、Cu、Zn、Cd、Pb、As、Hg分别对污染物的削减效应表现出不同的敏感性,其中金属汞(Hg)最高,金属铜(Cu)敏感性最低;最后结合相应原则给出了土壤重金属污染的防治建议和措施。

In this paper,the study on the tracking and investigation of heavy metal pollution in the soil was carried out in the first batch of sponge city pilot construction area-Suining City,Sichuan Province,and the heavy metals Sn,Cu,Zn,Cd,Pb,As in seven common soils before and after the construction of the sponge city were compared.The results of ICP-MS and atomic fluorescence method were used to study the reduction of heavy metal pollution in the soil and the sensitivity of the heavy metal ions.The results show that the heavy metal content in the soil after the construction is obviously lower than that before construction,the pollution degree of the heavy metal is reduced and the effect of the reduction is obvious,and the biological content of the typical sponge structure the remediation and purification function and the osmotic drainage function enable the content of heavy metal pollutants in the soil to be reduced;meanwhile,the detected seven common heavy metals Sn,Cu,Zn,Cd,Pb,As and Hg respectively show different sensitivity to the reduction effect of the pollutants,wherein the metal mercury(Hg)is the highest,The sensitivity of the metal copper(Cu)is the lowest;and finally,the prevention and treatment suggestions and measures of the heavy metal pollution of the soil are given in combination with the corresponding principles.