TABLET 



Companson of Chlordanes in Arctic Air. 



Location 



TC 



CC 



(pgm') 



TN 



CN 



ZChlordanes 



4.4-8.8 

 6.8 



3.6-13 



3.6 

 L9 



2.1-3.7 



a. Panon etal.. 1989 



b. Hargrave««/., 1988 



c. Pacvna & Oehme, 1988 



d. Oehme &Ottar, 1984 



e. Hoffc&Chan, 1986 

 * Winter/Spring 



Other OC's measured over the Bering and Chukchi Seas 

 were HCB. TC, CC, TN, CN, and PCC (Tables 3b,5). Mean 

 HCB levels were 210 pg m ', close to the values found in the 

 Canadian and Norwegian Arctic (Table 6). The average 

 concentration of chlordane components (TC-i-CC+TN-i-CN) 

 was 6.8 pg m\ similar to levels found in the Canadian Arctic 

 (Table 7 ). The average ratios of the chlordanes ( R=CC:TN:TC ) 

 in the Bering and Chukchi were 1.0:0.46:0.81. Although the 

 TC:CC ratio is less than unity, there appears to be more TC than 

 TN, a reversal of the order found in northern Canada by Hoff 

 and Chan ( 1986) (R=l .0:0.89:0.56) and Patton el al. (1989) 

 (R=1.0:0.74:0.50). 



Polychlorinated camphene concentrations of 38 pg m' 

 were fourth highest of the atmospheric pesticides and were 

 nearly the same as those observed in northern Canada 

 (Table 8). Surveys of OC's in fish from the Canadian Northwest 

 have found PCC's to be the most abundant pesticide residue 

 (Muir et al., 1988; 1990a; Norstrom et al., 1988). Levels of 

 PCC's in fish were sufficiently high that Muir ci al. ( 1990a) 

 noted that consumption offish and fish livers by Inuit may lead 



to an intake of PCC's that exceeds the US National Academy 

 of Sciences' (1977) acceptable daily intake. Atmospheric 

 transport has recently been suggested as the source of PCC's to 

 the arctic ecosystem (Bidleman et al., 1989). 



High concentrations of the DDT' s and PCB's were found 

 over the Bering and Chukchi Seas (Table 4). These chemicals 

 were entering the sampling system through the front end of the 

 sampling apparatus ( breakthrough of DDT' s from front to back 

 PUF was 1-13%) and no system contamination of either DDT 

 or PCB was found in the blanks. The DDT's and PCB's were 

 confirmed by GC-MS. As Table 8 shows, concentrations of 

 DDT' s and PCB ' s found during cruise AK-47 are significantly 

 higher than have ever been reported in the arctic regions. 

 Contamination of the ship with these chemicals is suggested by 

 these comparisons. It was known that the ship had been 

 fumigated for insects prior to the cruise and high DDT 

 concentrations suggest that this insecticide is what was used. 

 Hydraulic fluids, which were found all over the ship, are known 

 to contain significant amounts of PCB's in the United States 

 (Interdepartmental Task Force on PCB's, 1972). It is not 



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