Study On The Impact Of Pesticide Residues On Soil Of Retired Pesticide Factory Field

With the rapid development of urbanization and industry in China, our country environmental pollution is increasingly serious, especially in the land project, due to insufficient understanding of soil pollution, soil pollution in the using process of the environmental situation is more prominent.Many industrials and enterprises move out ofcities gradually or retire permanently. The nature of the land has changed, the original industrial land was gradually developed for residential land or public land. After Chemical Companies moves out, as the site of the original soil is polluted in different degrees, to change the nature of the land, in the land of the use of the process may be the health effects, therefore in the site soil pollution risk assessment work is very important.This research take Zhejiang industrial abandoned land in a pesticide enterprises as the research object, using measurements by monitoring foreign soil monitoring and remediation of soil contaminants in concentrations of standards to allow for soil and sediment sampling and testing water quality analysis and situation assessment, the project area within the soil and surrounding land are subject to different degrees of pollution; major soil pollutants isopropyl toluene, o-phenylenediamine and other benzene compounds, the extent of its excessive pollution more serious, and pollution over the distribution range is divided into wide; through the site to identify sources of risk, identify the main focus of pollutants such as BHC, a lower concentration of heavy metals in soil; in the analysis of water samples tested, results in major pollutants were ammonia nitrogen, total phosphorus. Calculated for parathion and other contaminants in a variety of transmission of the exposure, and soil remediation to determine the target; requirements based on site repair, targeted to commence site repair. Research results obtained are as follows:(1) Project area located blocks stacked on top of the mound is not the characteristics of pollutants in contaminated sites, but higher concentrations of total phosphorus, in addition, the concentration of titanium is also very high.(2) The main venue river sediment pollutants HCH (total), the main contributor to isomer8-BHC. It can be inferred from river sediments by raw production unit emission pollution.(3) Project area surface water ammonia water quality of five sections, the Ministry of nitrogen, total phosphorus exceeded, there are signs of eutrophication; heavy metals like mercury in the two sections exceeded; δ-HCH in a cross-section are detected. Site water in CODcr, ammonia, total nitrogen exceeded in serious condition; parts of water could be detected in space HCH exists.