Geochemical fractionation of trace elements in sediments of Hugli River (Ganges) and Sundarban wetland (West Bengal, India) - Serena Massolo; Antonello Bignasca; Santosh Kumar Sarkar; Mousumi Chatterjee; Bhaskar Deb Bhattacharya; Aftab Alam (Environmental Monitoring and Assessment, 2012)