Application of chelating resin

Chelating resins have developed rapidly in the fields of inorganic, metallurgy, analysis, radiochemistry, medicine, catalysis and marine chemistry

(1) Separation, concentration and recovery of trace metal ions

①Method for separating complexing metal ions from salts formed by cations with low complexing ability.

To obtain metal ions with weak complexing ability, a large excess of resin can be used

② Separation of trace metal ions from metal salts containing complexing cations When the trace metal ions to be recovered and the removed metal salt cations have the same affinity for the resin, the separation is difficult

③ It is not easy to separate complex trace metal ions from electron donating compounds by weak complexing reagents, but it is possible to achieve this with chelating resins

④ Separation of complex trace metal ion by strong complexing reagent The stronger the coordination ability of the complexing reagent, the more difficult it is to separate its metal ions

(2) Quantitative separation of metal ions

① It is appropriate to use dilute strong acid if the metal ions can be separated by a salt solution in a strong acid and can be titrated immediately

②Filtration of metal ions When selecting quantitative separation of metal ions, it is very good if they can be separated without the chromatographic development of the metal adsorption layer

③Selective filtration of metal ions using complexing agent solution When low-molecular complexing agents coexist in the solution, the selectivity and stability order of the resin to metal ions can be changed, so that the separation can proceed smoothly

④Selective filtration using metal ion selective masking makes specific metal ions complex to mask and hinder the adsorption on the resin for separation

NH₃/NH₄NO₃KCN，，Pb，UO₂

(3)、

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(4)

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When refining organic solvents, since the affinity between the resin and the organic solvent is very important, the organic solvent needs to be added with water

(5) Other

The IDA resin with a small degree of cross-linking is coated on paper for quantitative analysis of a very small amount of metal ion mixture

Make it adsorb Cu(I)