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Mostafavi A, Afzali D, A. Taher M. Simultaneous Separation and Preconcentration Trace Amounts of Cd2+, Mn2+, Ni2+, Zn2+ and Fe2+ onto Modified Amberlite XAD-4 Resin that Loaded with Pyrocatechol Violet. ajc [Internet]. 2010 Mar. 30 [cited 2024 Nov. 29];18(3):2303-9. Available from: https://asianpubs.org/index.php/ajchem/article/view/20988