Zuo et al. (2001) reviewed the potential uses of chitin and chitosan, including removal of heavy metals, pesticides, PCB and dyes. Wantanaphong et al. (2005) found that chitin could remove more than 70% of the metals from a solution of synthetic groundwater containing 10 mg l-1 Cu, Pb and Zn and 1 mg l-1 Cd.