§ Mr. Morley
The Department has not recently undertaken research specifically on the levels of persistent and bio-accumulative chemical in the food chain and environment in the Thames Estuary. However, the Environment Agency has an on-going monitoring programme in the Thames Estuary which includes the following persistent and bio-accumulative substances1,2,3 trichlorobenzene; 1,2,4 trichlorobenzene; 1,3,5 trichlorobenzene; Aldrin; Anthracene: Benzo (a) pyrene; DDE (pp); DOT (op); DOT (pp); DOT total; Dieldrin; Drins total; Endosulphan a; Endosulphan b; Endrin; Fenitrothion; HCB; HCH alpha; HCH beta; HCH delta; HCH gamma; HCH Total; Hexachlorobenzene; Hexachlorobutadiene; Isodrin; Lambdacyhalothrin: PCB 101; PCB 118; PCB 138; PCB 153; PCB 180; PCB 28; PCB 52; PCB Total (Congeners 28,52, 101,118,138,153,180); TDE (pp); Tributyltin; Trichlorobenzene total; Trifluralin
In addition, the Food Standards Agency has a statutory monitoring programme to detect marine biotoxins in shellfish sampled from shellfish harvesting waters. The Agencies also keep abreast of research relating to Thames Estuary, including a recent study on tributyl tin levels.