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• Effect of temperature in ion-exchange separation of rare-earth elements and recovery of EDTA from effluent solutions
• Hydrogen as a retaining ion for rare-earth separation by ion exchange with EDTA and DCTA
• Separation of the lanthanide series and yttrium using phosphonic and iminodiacetic acid resins
• Amino acids as retaining agents for separation of rare-earth elements on ion-exchange resin