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Chelation of mercuric ions by an iminodiacetate-Sepharose gel was evaluated. The retentive properties of iminodiacetate-Sepharose gel column was studied towards proteins varying the composition of eluting systems from 2-mercaptoethanol to NaCl and imidazole, determining also the extent of mercury leaching. It was demonstrated that chelated mercury contained free sites for interaction with proteins...