Isomer‐specific patterns and toxic assessment of polychlorinated biphenyls in resident, wintering migrant birds and bat collected from South India

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Abstract
Isomer‐specific concentrations of polychlorinated biphenyls (PCBs) including highly toxic non‐, mono‐ and di‐ortho coplanar congeners were determined in resident, migratory birds and bat collected from south India. Among 11 different species, total PCB concentrations were in the range of 80–2000 ng/g (wet wt) in birds and 190–330 ng/g (wet wt) in bat. IUPAC 105, 118, 126, 138, 153 and 180 were the predominant congeners in birds and bat. Concentrations of three non‐ortho coplanar PCBs such as 3,3’, 4,4'‐T4CB, 3,3’, 4,4’, 5‐P5CB, and 3,3’, 4,4’, 5,5'‐H6CB were 2–3 orders of magnitude less than those of total PCBs. Toxic equivalencies (TEQs) were estimated based on Toxic Equivalent Factors (TEFs) proposed by Ahlborg et al. (Chemosphere, 28, 1049–1067, 1994). TEQs of non‐ and mono‐ortho PCB congeners in various birds were in ihe range of 10–50 pg/g (wet wt), in which Short‐billed Mongolian Plover contained the lowest and White‐cheeked Tern had the highest. In most of the species, non‐ortho congeners contributed greater TEQs. Toxic assessment results revealed that the TEQs in resident birds, bat and wintering migrant birds collected from India were belonging to the LOEL and NOEL levels.

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