Occurrence of Chlorinated Paraffins in Beluga Whales (Delphinapterus leucas) from the St. Lawrence River and Rainbow Trout (Oncorhynchus mykiss) and Carp (Cyprinus carpio) from Lake Ontario

摘要

Samples of 25 dead beluga whales (Delphinapterus leucas) from the St Lawrence River estuary as well as samples of 10 rainbow trout (Oncorhgnchus mykiss) and 3 carp (Cyprinus carpio) caught in western Lake Ontario were ana- lyzed for total short- (C_10-C_13) and medium-(C_14-C_17) chain chlorinated paraffins (SMCCPs) using gas chromatography-low resolution negative chemical ioniza- tion mass spectrometry (GC-NCI-MS) in the selected ion monitoring mode (SIM). Short and medium-chain chlorinated paraffins were quantitatively identified using two commercial preparations. SMCCPs were detected in all samples. Results ranged from 1.1 to 59 μg/g wet weight in beluga liver tissue, from 6.4 to 166 μg/g wet weight in beluga blubber. and from 0.41 to 9.7 μg/g wet weight in the two freshwater species. The beluga results are higher than those reported for marine mammals in Europe. Total short- and medium-chain chlo- rinated paraffin levels in the beluga blubber are comparable to previous ZPCB and ∑DDT resultS for the same population of beluga whales. The mean ZSMC CP concentration in the carp was 0.90 μg/g wet weight and 2.7 μg/g wet weight in the rainbow trout. Results from the freshwater species are comparable to those reported for fish sampled from other industrially impacted watemys in North America but are elevated relative to marine species from European stud- ies. Comparison of the SIM GC-NCI-MS data with results of gas chromatogra- phy-high resolution negative ion mass spectrometry (GC-HR-NIMS) analysis from another study showed that the two analytical techniques are not congru- ent. The differences may be due to the effects of coeluting interfering organochlorine substances.