Study Of Organochlorine Pesticides In The Rice Of Jiangxi Province

POPs are widely found in the environment, which originate from humanactivities in production, such as metal smelting, waste incineration and sprayingpesticide. Vegetation is an important environmental media in POPs’global cycle,especially the residues of organchlorine pesticides in rice is closely related tohuman life，which influence human health through the food chain.OCPs concentrations of rice and soil in Jiangxi province were mainly researched.Software Excel2003and SPSS11.7was used for data processing and statisticalanalysis in order to find the correlation between the residues of OCPs and thesampling environment，and then a heath risk assessment was held. ARCGIS9.3wasapplied to analyze the spatial distribution of OCPs in rice of Jiangxi province. Theresults were showed as follow:1）The detection rates of HCHs，DDTs and heptachlor of Rice were100%,100%and93.83%respectively. There were HCB residues in some areas. The main isomersof DDTs and HCHs were P,P’-DDT and β-HCH respectively.The average value oftotal organochlorine pesticide of all detected areas was144.34μg/kg and ΣDDTs andΣHCHs were95.31μg/kg,37.02μg/kg respectively. And the DDTs residues allbeyonded the maximum residue limits in Jingdezhen, Jian, Ganzhou, Yichun andShangrao.2）Total organochlorine pesticide residues in rice was positively correlated withlocal forest coverage rate (P=0.029),which indicated that pesticide killing insects onthe tree was one of the main sources of organochlorine pesticides in rice. And itsaverage temperature was positively correlated with local residues of HCHs, DDTs andtotal organochlorine pesticide, respectively.3）The residues of DDTs and heptachlor of rice in Jiangxi were similar with thatof Anhui and Hubei, but the residues of HCHs and HCB were less than that in thetwo provinces. And all components of OCPs of rice in Jiangxi were less than that inthe three northern provinces.4）The POPs residues in rice were obviously more than that of local soil andlocal vegetables. Organochlorine pesticide residues in rice were positively correlatedwith local organochlorine pesticide residues in soil (P=0). Because of rice’s selectiveabsorption to isomers of HCH and DDT and some external factors, there was relationship between soil and rice with DDTs residues.5）The distribution trends of Organochlorine pesticides residues of rice in Jiangxiwere showed as follow: The ΣHCHs residues in the Northeast and Southwest were alittle more than other areas, and the rest place trend were slightly undulating. Thetrend of ΣDDTs was gradually decreased from east to west, but the change trend waslittle. HCB residue mainly concentrated in the Middle and western areas, and therewas the most highest detecting concentration in Yihuang County nearby. And theheptachlor residues mainly distributed in the north and southwest of Jiangxi.6）The trend of health risk of HCH and DDT in men and women in JiangxiProvince were consistent. The highest health risk of HCH was found in Ganzhou, andthe lowest in Nanchang. The highest health risk of DDT was found in Jian, and thelowest in Pingxiang. And on the whole health risks of HCH and DDT, women washigher than men.