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• W1966393401 abstract "The bioaccessibility of metals (Al, Ca, Fe, Mn, Ag, Cd, Co, Cu, Ni, Pb, Sn, Zn) in oxic estuarine sediments has been evaluated using solutions of a commercially available protein (bovine serum albumin; BSA) that mimic the chemical conditions encountered in the gut environment of many deposit-feeding organisms. Over a 20 h incubation period with 5 g L− 1 BSA, metal mobilisation was generally biphasic in that a relatively short period of rapid release was succeeded by more gradual release or approach to equilibrium, although in some cases metal readsorption was evident during the time-courses. Availability to BSA, defined as metal released after 20 h relative to metal extracted by boiling aqua regia, was greatest for Cd, Ni, Ca and Zn and lowest for Fe and Mn, and correlated well with, but was an order of magnitude lower than, metal digested by acidified hydrogen peroxide. Time-courses conducted in the absence of the protein revealed that significant quantities of Ca and Mn were water-soluble, reflecting the partial dissolution of carbonates and hydrous Mn oxides, respectively. Additional experiments indicated a net increase in metal release with increasing BSA concentration and, with the exception of Ca and Mn, a substantial increase in metal mobilisation after sediment organic matter had been digested by peroxidation. These observations suggest that, apart from Ca and Mn, metal release proceeds via complexation with component amino acids of the protein, denudation of organic host phases, and exposure of inorganic, metal-bearing minerals. Accordingly, the bioaccessibility of a metal is predicted to be dependent on its (i) affinity for proteinaceous ligands, (ii) association with components of digestible sediment organic matter, and (iii) degree of binding at relatively weak sites on sediment phases that are exposed or modified by the action of proteins and other chemical constituents of the gut environment." @default.
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• W1966393401 date "2007-12-01" @default.
• W1966393401 modified "2023-09-27" @default.
• W1966393401 title "An evaluation of metal bioaccessibility in estuarine sediments using the commercially available protein, bovine serum albumin" @default.
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• W1966393401 doi "https://doi.org/10.1016/j.marchem.2007.08.007" @default.
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