5 Polychlorinated biphenyls (PCBs)
•Produced since 1944
•Banned in U.S. by 1979
•Used in production of electrical equipment, paints, plastics, adhesives, and coating compounds…
•Found everywhere in the ocean
•Released in environment by unregulated incineration of discarded productsDDT & PCBs affects:
•Copepod and oyster development.•Death of shrimp and a variety of fish.BiomagnificationHg, Pb, Cd, Cu Heavy metals resist biodegradation Natural occurrence- volcanoes
•Mercury (Hg)- toxic when attached to short carbon-chain alkyl group, strongly neurotoxic, birthdefects
•Lead (Pb)- from batteries, sewage, fuel additives, neurotoxic effects, mental development in children
•Cadmium (Cd)- from batteries, sewage, electroplating factories, effects on human kidney function, bone deformitiesToxic MetalsMinamata Disease (1953-1960)–Japan
•Industrial pollution from plastic plant; dumped mercuric chloride into bay.
•Ingestion of Hg tainted shellfish 43 dead and 700 permanently disabled.
•Symptoms: kidney damage, neuromuscular deterioration, birth defects,insanity, death.
•Bay is still unusable for fishing and shell fishing.
•Surviving victims received $24,200 as settlement.