You can take a look on "The effect of depuration on heavy metals, petroleum hydrocarbons, and microbial contamination levels in Paphia undulata (Bivalvia: Veneridae)"
We have just published some research on accumulation and depuration kinetics in the bivalve Scrobicularia Plana, it may be of interest to you:
Cardoso P.G., Grilo T.F., Reis A.T., Coelho J.P., Pereira E., Pardal M.A. (2015) Field transplantation of the bivalve Scrobicularia plana along a mercury gradient in Ria de Aveiro (Portugal): Uptake and depuration kinetics. Science Of The Total Environment . 512-513, 55-61.