Abstract
Adsorption kinetics of the interaction between Pt, Pd and Rh (defined here as platinum group elements, PGEs) ions and macromolecular organic compounds (MOCs, >10 kDa), including humic acid, carrageenan and bovine serum albumin, and different cutoff fractions of natural organic matter (>1 kDa and >3 kDa) obtained from seawater using centrifugal ultrafiltration devices were investigated. For a given element, all the adsorption kinetics did not reach equilibrium except the interaction between Pt and >1 kDa cutoff, and between Pd and humic acid. For all the tested MOCs, the adsorption kinetics could be divided into two stages, a rapid adsorption process in the first 8 h and the desorption stage after the first 8 h until the equilibrium. The change trend of partition coefficient (log10Kd) values with experiment time was consistent with that of the kinetic curves. However, in the interaction between PGE ions and natural dissolved organic matter (NDOM), an obvious difference in the change trends of log10Kd and kinetic curves was observed. It indicated that the partition behavior of PGE ions interacting with NDOM in seawater was a combined effect of different organic constituents. The adsorption and log10Kd of PGEs in the >1 kDa NDOM fraction were higher and more stable than those in the >3 kDa NDOM fraction. The results also indicated that the 1–3 kDa NDOM may dominate the interaction between PGEs ions and NDOM. Moreover, no kinetic model could perfectly simulate the adsorption process. It indicated that the colloidal struction and morphology of MOCs or NDOM in seawater might be inhomogeneous. Hence, the interaction between PGE ions and organic matter in seawater was a complicated process and needs further research.
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We thank Yuxi Lu and Tianci Gao from Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences for their constant field and laboratory assistance, helpful advice and in-depth discussion.
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Foundation item: The National Natural Science Foundation of China under contract No. 41376083; the Strategic Priority Research Program of the Chinese Academy of Sciences under contract No. XDA23050303.
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Liu, K., Gao, X., Xing, Q. et al. Adsorption kinetics of platinum group elements onto macromolecular organic matter in seawater. Acta Oceanol. Sin. 38, 8–16 (2019). https://doi.org/10.1007/s13131-019-1433-3
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DOI: https://doi.org/10.1007/s13131-019-1433-3