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Hydroxylated and methylsulfonyl polychlorinated biphenyl metabolites in albatrosses from Midway Atoll, North Pacific Ocean

Concentrations of hydroxylated metabolites of polychlorinated biphenyls (PCBs) (OH‐PCBs) and methylsulfonyl metabolites of PCBs (MeSO2‐PCBs) were determined in plasma and liver of albatrosses collected from the Midway Atoll in the central North Pacific Ocean. The mean total concentrations of OH‐PCBs in plasma of Laysan albatrosses (Diomedea immutabilis) and black‐footed albatrosses (Diomedea nigripes) were 11.5 and 27.1 ng/g wet weight, respectively. Total concentrations of OH‐PCBs were only one‐ to fivefold less than those of total PCBs. 4‐hydroxy‐2,2′,3,4′,5,5′,6‐heptachlorinated biphenyl and 4‐hydroxy‐2,2′,3,4′,5,5′‐hexachlorinated biphenyl were the predominant polychlorinated biphenylols, constituting 70 to 90% of the total OH‐PCBs. Concentrations of MeSO2‐PCBs in liver were between 10.6 and 77 ng/g, lipid weight, approximately 250 times less than those of total PCBs. The MeSO2‐PCBs congeners retained in the liver were dominated by those having the methylsulfonyl group in the 3‐position.