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| | Valdivia, Marcelo Rodríguez, Urday, Edwin Urday and Velásquez, Gladys Ocharán Evaluation of the cation exchange capacity, cec, of natural zeolite or of zeolite exchanged with sodium from ignimbritic formations in Puno, Peru, by measuring the removal of ammonium and heavy metals. Rev. Bol. Quim, June 2021, vol.38, no.2, p.68-79. ISSN 0250-5460
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