Abstract:

Sediment,moss and seabird-dropping samples were collected from Ny-lesund to investigate the distribution of organochlorine pesticides(OCPs)and polychlorinated biphenyls(PCBs)in Arctic areas.OCPs and PCBs were analyzed by the method of capillary gas chromatography(GC-ECD).Recoveries of all samples and blanks were at the range of 69.5%—92.2%(78.8%),75.1%—112.1%(98.5%)and 67.7%—95.1%(79.5%),respectively,and the relative standard deviations were 6.7%,8.0% and 11.3%.The major monomers of the OCPs were HCHs with the major isomers of α,β-HCH and DDTs with the major isomer of p,p'-DDD,whose concentrations were at the range of 0.86—4.50 ng/g(2.24 ng/g)and 0.22—1.09 ng/g(0.55 ng/g).The concentrations of PCBs were 0.20—3.25 ng/g(0.84 ng/g)and the major congeners were 4,5 and 6 chlorinated species,which were up to 23.8%,26.7% and 32.3% of total PCBs,respectively.Through the ratio analyses of HCHs and DDTs and the principal component analysis of PCBs,the atmospheric transport was proved to be one of major ways of contaminant source and the source of the POPs was imported by the same way.