Homologue concentrations of chlorobornanes in selected samples from the Bering/Chukchi Sea

An electron capture negative ion mass spectrometric method for quantitative determination of chlorobornanes was tested on selected samples from an arctic marine food chain. The method provided sufficient sensitivity to detect residues down to 0.3 ppb. Detailed area counts at prescribed mass scans were collected and processed for two selected samples, a fish and a neuston sample. Total chlorobornane concentrations were, 1.6 ng/g for the neuston and 12.8 ng/g for the pollack. Chlorine homologue class (Cl 6 to Cl 10 ) concentrations for each sample were determined. Relative homologue amounts linked the neuston to an atmospheric input since it had highest concentrations of Cl 6 , which is more prevalent in air, while the fish had a higher relative levels of Cl 8 and Cl 9&10 homologues indicative of the tendency for these more lipophilic homologues to concentrate in fish lipids.