Characteristics And Evaluation Of Water Environment Pollution In Sheyang River Estuary, Jiangsu Province

Surface water and groundwater are important water sources for living,industry,agriculture and aquaculture.With the rapid economic development of the region and the enhancement of human activities,the affects of"waste liquid,waste gas and waste residue"produced by industrial production and human life on the water environment is gradually becoming more serious.It is particularly important to strengthen the investigation and evaluation of the water environment in the region.This paper is based on the research of Sheyang River estuary area,which covers the upstream and downstream of Sheyang River sluice that are nearly 12 km long.11groups of samples were collected,including 3 groups of surface water samples and 8groups of groundwater samples;11 inorganic ions and 203 organic pollutants in the samples were analyzed by IC-900 and GC-MS,and the distribution characteristics of pollution indexes in the region were studied.The fuzzy synthetical evaluation of water quality and ecological risk assessment were used to evaluate the water quality in this area.The main conclusions are as follows:?1?Through field investigation and indoor analysis,combined with the analysis data obtained,it is found that the inorganic ions in excess of the standards in the surface water of the study area are F^-,and the water quality evaluation results shows that surface water in this area is worse than Class V water;the main organic pollution factors in the surface water of the study area are organochlorine pesticides residues,and the ecological risk evaluation results of organic pollutants show that the surface water of the study area presents a high ecological risk trend.?2?IC-900 and GC-MS were used to determine the content of inorganic ions and organic pollutants in the researching area,and the analysis and evaluation carried out show that that the main excessive inorganic ions in the groundwater in this area are F^-?Cl^-?NO₃^-;and the results of water quality evaluation show that SYG05 in the regional groundwater sampling points is class III water,SYG03 is class IV water,with the rest of sampling dots being worse than class V water;The main underground-water organic pollution factors in this area are DDT,phenanthrene,pyrene and 2,6-dinitrotoluene.The ecological risk assessment results of organic pollutants show that the groundwater in this area also presents a high ecological risk trend.?3?Based on the comprehensive analysis of the variation trends of inorganic ion concentration existing in groundwater and surface water,it is found that the content of surface-water inorganic ion in SYG02 and SYG03 located in the downstream part of Sheyang River sluice is higher than it in SYG01,which indicates that these two sampling points are affected by the mixing of saltwater and fresh water.