HOMOLOG CONCENTRATIONS OF CHLOROBORNANES IN SELECTED SAMPLES FROM THEBERING CHUKCHI SEA

An electron capture negative ion mass spectrometric method for quantit ative determination of chlorobornanes was tested on selected samples f rom an arctic marine food chain. The method provided sufficient sensit ivity to detect residues down to 0.3 ppb. Detailed area counts at pres cribed mass scans were collected and processed for two selected sample s, a fish and a neuston sample. Total chlorobornane concentrations wer e, 1.6 ng/g for the neuston and 12.8 ng/g for the pollack. Chlorine ho mologue class (Cl6 to Cl10) concentrations for each sample were determ ined. Relative homologue amounts linked the neuston to an atmospheric input since it had highest concentrations of Cl6, which is more preval ent in air, while the fish had a higher relative levels of Cl8 and Cl9 &10 homologues indicative of the tendency for these more lipophilic ho mologues to concentrate in fish lipids.