Behaviour of heavy metals in the estuarine area of the Capibaribe River in the Northeast of Brazil F.M.M. Brayner, A.M. Freitas Barbosa, H.K. Phillipini da Silva and L. Vieira de Melo J. Phys. IV France, 107 (2003) 221-225 DOI: 10.1051/jp4:20030283