Weak and strong basic resins were synthesized by crosslinking with 1,7‐dibromoheptane and 1,12‐dibromododecane and subsequent N‐methylation reaction of branched and linear polyethyleneimine. All the resins are insoluble in water. It was found that the N‐methylated resins showed the highest retention ability for uranium. The resins do not retain significatively iron (> 10%), and only two of them retain copper above 80% at optimum pH. Elution assays with sulphuric acid, sodium carbonate, and thermal stability were also carried out.
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Rivas et al. (1989) studied this question.
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