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- W2034162091 abstract "Chemical models have been used to examine the adsorption behaviour of Cu, Mn and Zn onto freshly precipitated iron oxyhydroxide as a function of pH and salinity. Solutions of varying salinity (S = 0, 5, 10, 15‰) containing 0.05 mM Fe and 1.5 μM of each metal were allowed to attain equilibrium under carefully controlled conditions. The solutions were analysed for the dissolved metals (passing a 0.45 μm filter) over the pH range 3.5–10. The pH of the onset of adsorption followed the order Cu < Zn < Mn and it occurred at pHs well below the hydrolysis of the cations in the bulk solution. Hypotheses on the metal uptake involving coulombic interactions between the precipitate and the metal species in solution did not fit the observations and it was concluded that a detailed knowledge of surface complexation reactions was required, as was shown for Cu. The adsorption isotherms for Cu were independent of salinity, on the other hand, those for Zn and Mn showed an increase in the pH of the adsorption edge with increases in salinity. It was suggested that the major cations, Ca2+ and Mg2+, were probably co-adsorbed and competition from these species for adsorption sites increased with increasing salinity. The results reported here are useful for the development of predictive models for the fate of trace metals injected into estuarine systems where iron compounds may be freshly precipitated." @default.
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- W2034162091 date "1982-01-01" @default.
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- W2034162091 title "The adsorption of Cu, Mn and Zn by iron oxyhydroxide in model estuarine solutions" @default.
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- W2034162091 doi "https://doi.org/10.1016/0043-1354(82)90032-x" @default.
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