The measurement of metals by diffusive gradients in thin films (DGT) at sediment/water interface (SWI) of bay and remobilization assessment

The fine-scale profile (concentration/flux) of 14 metals at sediment/water interface (SWI) of Yingkou bay was measured by passive sampler-DGT (diffusive gradients in thin films) probe and HR-ICP-MS instrument. Fe profile in sediment porewater indicated redox reactions, which was verified by peaks at −6.75, −7.75, −8.75 and −11.75 cm. Mn profile in sediment porewater indicated redox-sensitive character with the continuous increase in profile from −3.75 to −5.75 cm, and the subsequent peaks at −6.25, −8.25, −9.75 and −11.25 cm. Both Fe and Mn profiles indicated low values at −10.25 cm, which was due to the formation of pyrite and the adsorption of Mn on it. The co-occurrence of some peaks and broad feature near peaks of trace metals and Fe/Mn at same depths of profiles indicated coupled geochemical process and co-remobilization. The diffusive fluxes of metals across SWI were also calculated and investigated.

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