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- W1569355005 abstract "The distribution of the metal ions Zn and Pb between particulate and dissolved phase in river Glatt was studied by field measurements and compared with calculated simulations, using parameters obtained by adsorption experiments with natural suspended particulate material. Differences in distribution coefficients obtained from field data are observed in function of the sampling locations and of the composition of the particulate matter. Experiments in which metal ion solutions are titrated with a suspension of natural particles and analyzed by anodic stripping voltammetry, are interpreted in terms of binding capacities and conditional stability constants of Zn and Pb with the surface sites. Binding constants of a particular metal ion varied very little for all samples. We obtained mean values for the conditional average complex formation constants at pH 8 of: logcond K Pb = 9.44 ± 0.18 and logcond K Zn = 8.17 ± 0.20. At this pH, binding capacities of 5 ⋅ 10−3 – 1.7 ⋅ 10−2 mol/kg of particles were obtained for samples collected at different locations and times; organic material, iron and manganese oxides are considered to be the main components that control the adsorption to the particles. Distribution coefficients are calculated from the experimentally obtained binding capacities and conditional stability constants. Calculated distribution coefficients for Zn agree with those obtained from the field data and are not very sensitive to changes in the composition of the solution. Good agreement was obtained for lead as well; for some samples it was important to take two types of sites with different affinity into consideration." @default.
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- W1569355005 date "1990-01-01" @default.
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- W1569355005 title "Interaction of trace metals with natural particle surfaces: Comparison between adsorption experiments and field measurements" @default.
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- W1569355005 doi "https://doi.org/10.1007/bf00878242" @default.
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