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Evaluation of Diazatetraoxa Cryptand as Extractant for Transition Metals and Pb2+. Pak. J. Anal. Environ. Chem. [Internet]. 2014 Dec. 1 [cited 2025 Jul. 12];15(2):20-5. Available from: http://pjaec.pk/index.php/pjaec/article/view/332