[THIS DATASET HAS BEEN WITHDRAWN]. Data comprise concentrations of organochlorine insecticides and mercury in sparrowhawk, kestrel and heron livers taken during post mortem from deceased birds of prey sent into the Predatory Bird Monitoring Scheme (PBMS) by the public. The data are presented as micrograms of contaminant per gram of liver tissue (wet weight). The PBMS is a long-term, national monitoring scheme that quantifies the concentrations of contaminants in the livers and eggs of selected species of predatory and fish-eating birds in Britain. Levels of contaminants are monitored to determine variations between species and regions, changes over time and effects on individual birds and their populations. The Scheme is currently funded by CEH, Natural England, the Environment Agency (EA) and the Campaign for Responsible Rodenticide Use (CRRU). Full details about this dataset can be found at https://doi.org/10.5285/e39e3afb-eb90-4a7d-921d-e03b1a0f414d

Polychlorinated biphenyls (PCB), chlorobenzenes (CB) and organochlorine pesticides (OC) data from river water collected at various sites within the Humber catchment area as part of the Land Ocean Interaction Study project (LOIS). Data were collected at regular weekly intervals and intermittently during periods of high flows. All sites were samples from early 1994 to the end of 1996 except for O12, which was sampled from November 1994 till November 1996. The sampling was carried out by the LOIS team at York University. The unfiltered samples were transported to the Institute of Terrestrial Ecology, Monks Wood, UK, where they were extracted with hexane, cleaned up by alumina column chromatography, concentrated and then analysed for CBs by Gas Chromatography-Mass Spectrometry (GC-MS) and PCBs and OCs by Gas Chromatography with Electron Capture Detection (GC-ECD). Full details about this dataset can be found at https://doi.org/10.5285/40ba6fd0-3d41-4520-8d78-cc8c893fd974

This dataset gives concentrations of chemical contaminants in the contents of eggs collected from colonies of the northern gannet, Morus bassanus, in the United Kingdom. The majority of eggs analysed are from colonies on Ailsa Craig (Firth of Clyde) and Bass Rock (Firth of Forth) and have been collected since 1971. The study examined 658 eggs collected between 1971 and 2009. Eggs analysed by the PBMS are collected by licensed collectors. Contaminants measured include organochlorine pesticides, total mercury, total PCBs and, for recent years, individual PCB congeners. The PBMS is a long-term, national monitoring scheme that quantifies the concentrations of contaminants in the livers and eggs of selected species of predatory and fish-eating birds in Britain. Levels of contaminants are monitored to determine variations between species and regions, changes over time and effects on individual birds and their populations. The Scheme is funded by CEH, Natural England, the Environment Agency (EA) and the Campaign for Responsible Rodenticide Use (CRRU). Full details about this dataset can be found at https://doi.org/10.5285/2ddf56e5-fbcd-48a3-b4a5-fe2a7d5c90a4

Data from analyses of addled and deserted sea eagle eggs collected by licensed collectors in Scotland. Contaminants reported include polychlorinated biphenyls (PCBs), organochlorine pesticides or their persistent metabolites, and a range of metals and metaloids. The white-tailed sea eagle has been re-introduced to a number of Scottish Islands since the 1980s. The Predatory Bird Monitoring Scheme (PBMS) is a long-term, national monitoring scheme that quantifies the concentrations of contaminants in the livers and eggs of selected species of predatory and fish-eating birds in Britain. Full details about this dataset can be found at https://doi.org/10.5285/72ed6237-aedf-43a7-b9e3-eef95320a2bb