The Pollution Characteristics And Chiral Signatures Of Typical Persistent Organic Environmental Pollutants In The Environment And Food From The Beijing Area

Persistent organic pollutants (POPs) can cause great harm to human health and ecological environment because of their special chemical properties. It is very important for the assessment of Residents’environmental health risk to investigate the pollution characteristics of POPs in environment and food timely.In this study, the pollution characteristics of three types of typical POPs in environmental media(soil and surface water) and food(animal fat and aquatic product) were systematically analyzed. The results showed that the total concentrations of23OCPs ranged from0.08to132.6ng/g in soil from Beijing. DDTs was the most dominant compounds among OCPs. The composition of DDTs indicated that the residues of these compounds in most soil samples originated from historical application, but there are also parts may be due to the use of dicofol lead to input new DDT. Chiral analysis showed that chiral OCPs in soil from Beijing area mostly existed in the form of non-racemic. The total concentrations of7PCBs ranged from nd to0.638ng/g with mean of0.141ng/g in soil of Beijing. The total concentrations of16PAHs ranged from14.34to5163.23ng/g in soil from Beijing. The PAHs contains4and over benzene ring were the most dominant components. PAHs isomeric ratios indicated that PAHs in soil from Beijing originated mainly from combustion. The concentrations of PAHs had significant correlation with total organic carbon content in the soil. PAHs were the mainly pollutants in surface water samples from Beijing, the total concentrations of which ranged from1238.3ng/L to5319.7ng/L. Nap, Fin and Phe were the mainly components. OCPs and PCBs could be found in all fat samples. DDTs and HCHs were the most dominant components. The mean concentrations of DDTs in animal fat samples were6.51ng/g (sheep),6.84ng/g (beef),5.1ng/g (pork) and0.75ng/g (chicken). The mean concentrations of HCHs in animal fat samples were1.47ng/g(sheep),1.52ng/g(beef),1.58ng/g(pork) and0.58ng/g(chicken). The DDTs and HCHs in chicken fat were significantly lower than in the other animal fats. Chiral analysis showed that chiral OCPs in most of the animal fat samples existed in the form of non-racemic.(-)-α-HCH,(+)-o, p’-DDT and (-)-o, p’-DDD was the preferential enantiomer in the most of animal fat samples. The concentrations of DDTs, HCHs, chlordane and endosulfan in aquatic product samples ranged from0.48to13.87ng/g, nd to4.662ng/g, nd to0.29ng/g and nd to4.17ng/g, respectively. DDTs was the mainly components. The concentrations of PCBs ranged from0.034ng/g to1.18ng/g, with the mean of0.33ng/g.Comprehensive analysis showed that the current pollution levels of OCPs, PCBs and PAHs in soil and surface water from Beijing area were in the medium level compared with other regions at home and abroad. Compared with other reports, OCPs and PCBs in food were at low pollution levels. The OCPs residues in the analyzed samples were not higher than the MRLs by China and the codex alimentarius commission.In addition, three multiresidue methods for the determination of POPs (OCPs, PCBs and PAHs) in soil, aquatic products, oil and fat were developed in this study. Compared with the traditional methods, the methods proposed were quite convenient and less organic solvent consuming.