Seasonal and temporal trends in polychlorinated biphenyls and organochlorine pesticides in East Greenland polar bears (Ursus maritimus), 1990–2001

摘要: Persistent organochlorine (OC) contaminants (PCBs, DDTs, chlordanes (CHLs), dieldrin, hexachlorocyclohexanes (HCHs), chlorobenzenes (CBzs)) were determined in adipose tissue of 92 polar bears (Ursus maritimus) sampled between 1999 and 2001 central East Greenland (698009 Nt o 748009N).OC data presented from subadults (S: females: =5 years males: =6 years), adult females (F: years) males (M: years).Summed chlorobiphenyl (SCBs) concentrations (41 congeners including co-eluters), SCHLs SDDTs the dominant classes OCs. SCBs found to be 6470, 8240 9100 ngyg lipid weight (lw) i subadults, males, respectively.The corresponding figures were: 2010 (S), 2220 (F) 1710 (M) ngy g lw for 462 559 gl w forSDDTs.The CB CB153 (32.3%), CB180 (21.4%), CB170 (12.2%) CB138 (11.0%).The metabolite p,p9-DDE (88.2%) dominated SDDTs, while oxychlordane was (57.1%) CHL-related compound.Concentrations SCBs, SCBzs, mirex dieldrin highest whereas SHCHs lower than but not those subadults.Adult had lowest dieldrin. Concentrations intermediate females. SCB, SHCH SCHL showed high seasonal variability remained relatively constant subadults.In general, OC levels appeared March January or September.Concentrations SCBzs all three groups, with a maximum SCBz both sexes peaked April–July, April–July until August males. SDDT increased adults.Temporal trends within last decade examined by comparing present reported samples 1990 same region. 1999–2001 22.1%, 66.3% 39.3% concentrations, respectively. contrast, differences amongst sex age groups temporal trends, where are 24.4%