Speciation and Bioavailability of Trace Metals (Cd, Cu and Pb) in Marine Sediment Samples from Placer Bay near Manila Mining Corporation, Surigao City, Philippines

Rey Y. Capangpangan, Ann Lilibeth F. Cane, Myla E. Lincuna, Jonel A. Ra\~{n}on, Rofe Amor P. Obena, Cale P. Pineda

Abstract


Chemical speciation by sequential extraction method of Cd, Cu and Pb of sediment samples from Manila Mining Corporation is described in this study. Different extractants was employed during the extraction process to each of the defined host fractions; exchangeable, carbonate-bound, organic bound, Fe-Mn bound and residual metal fractions. Moreover, excellent metal recoveries for sequential extraction protocol as compared to the total digestion method were observed for Pb and Cd, while low metal recovery for Cu. Results on the speciation and bioavailability of the studied trace metals in the sediment samples showed that the extractability (potentially available metal fraction) follows the order as Pb > Cu >> Cd. Likewise, the average residual fraction (nonavailable metal fraction) in all sampling stations was found to be equal to 29 %, 38 % and 88 % for Pb, Cu and Cd, respectively. Importantly, Pb was found to be widely distributed in all of the host fractions across all sampling stations, while Cu was more associated in the following fractions: Fe-Mn oxide bound metal fraction (33 %), organic-bound metal fraction (28 %) and in the residual fraction (38 %). Similarly, Cd metal was found to be significantly adsorbed in the residual fraction which suggests that Cd metal is less available in all of the sediment samples being studied. Results of this study may serve as a basis to the administrators in conceptualizing an effective framework for proper remediation and rehabilitation program in the area.

Keywords


chemical speciation, fractionation, total metal concentration

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Copyright (c) 2015 Rey Y. Capangpangan, Ann Lilibeth F. Cane, Myla E. Lincuna, Jonel A. Ra\~{n}on, Rofe Amor P. Obena, Cale P. Pineda

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