Cl- 



Cl CI 



^& 



CI CI 



CI — 



<^:^e, 



CI CI 



CI CI 



Fig. 2. Schematic representation of the photochemical degradation of PCBthexachlorobenzene) according to Bunce el al. ( 1978). 



ioo*-p 



Oh 



cd 



CQ 



t+- 

 O 



c 

 o 



.2 



C3 



t-H 

 C 



D 

 O 



C 



o 

 U 



o 



P 



15 e 50 — 



r -^^ ■• 



i 



\ o 







Q 



■^Q 



O 



■-D- 







1 



o 



-D-. 



t, hours 



Fig. 3. Change of the benzo(a)pyrene in time a) with addition; b) without addition of PCB in .sterilized sea-water; and c) by autooxidation with sunlight irradiation 

 on the surface of the Bering Sea, 5.V58' N, 175"28' W. 



345 



