Substances which accumulate in the environment and impact on wildlife are considered to be hazardous. Substances identified as a particular cause for concern include cadmium, mercury, lead, pesticides, polychlorinated biphenyls ( PCBs), polycyclic aromatic hydrocarbons ( PAHs) and brominated flame retardants ( PBDEs). Inputs of selected substances to the marine environment via rivers and effluent discharges have been quantified for the OSPAR Rivers and Direct Discharges ( RID) programme since 1990.
The layers show the assessments from the UK Marine Environment Monitoring and Assessment National (MERMAN) database, used for international reporting for the following substances in sediment and biota.
- Polybrominated diphenyl ethers (flame retardants) (PBDEs) – 4 layers covering BDE47, BDE99 and BDE209.
- Polychlorinated biphenyls ( PCBs)- 4 layers covering CB153 and CB118.
- Polycyclic aromatic hydrocarbons (PAHs) – 6 layers covering phenanthrene, naphthalene and pyrene.
- Metals – 6 layers covering Cadmium (Cd), Lead (Pb) and Mercury (Hg).
Updated graphs for dredge spoil hazardous substance content (as found in Scotland’s Marine Atlas) can be accessed in the ‘Data Sources’ tab at the bottom of the page.