Supplement to: Routti, Heli; van Bavel, Bert; Letcher, Robert J; Arukwe, Augustine; Chu, Shaogang; Gabrielsen, Geir W (2009): Concentrations, patterns and metabolites of organochlorine pesticides in relation to xenobiotic phase I and II enzyme activities in ringed seals (Phoca hispida) from Svalbard and the Baltic Sea. Environmental Pollution, 157(8-9), 2428-2434, https://doi.org/10.1016/j.envpol.2009.03.008