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- W2074898044 abstract "Binding of Pb 2+ ions to magnesium pectinates was studied by dialyzation technique in relation to their esterification degree ( E ) in the interval E = 0 to 84,7%, at an ionic strength I = 0.30. It has been found that the binding of Pb 2+ ions to pectinates proceeds according to the theory of multiple equilibria. The values of stability constant K and selectivity coefficient K Pb Mg evidence the high selectivity of pectinates towards Pb 2+ ions. Both those constants are, in contrast with value corresponding to other bivalent cations ( e.g. Ca 2+ , Sr 2+ ), independent on the esterification degree of pectin in the E 50% range. A strong binding of Pb 2+ to carboxyl groups takes place also at a high esterification degree of pectin. The exchange of Cr 3+ 3 K + was investigated with a model preparation of potassium pectate crosslinked with epichlorhydrin by a batch method at various pH of equilibrium solutions ( I = 0.15). Potassium pectate was shown to be a highly selective ion exchanger towards Cr 3+ . The binding of Cr 3+ to pectate also occured in a sufficient extent at a low pH of equilibrium solutions (pH 3). Due to a very strong binding of Cr 3+ to pectate a substantial shift of dissociation equilibrium of carboxyl groups in favour of further binding of Cr 3+ ions occured." @default.
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- W2074898044 date "1979-01-01" @default.
- W2074898044 modified "2023-09-23" @default.
- W2074898044 title "Binding of lead and chromium(III) cations to pectin" @default.
- W2074898044 doi "https://doi.org/10.1135/cccc19792915" @default.
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