The interaction of cobalt (II) and nickel (II) with 2-hydroxy-5-nitrothiophenol (HNTPh) and diphenylguanidine (DPG) produces chloroform-extracted mixed-ligand complexes (MLC) with the ratio Me (II): GNTF: DPG = 1: 2: 2. Conditions for extraction-photometric determination of cobalt (II) nickel (II) are revealed. It found that MLC are formed in a weakly acid medium (pH opt
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