Moghimi, Ali, and Nilofar Tajodini. “Preconcentration of Copper(II) in Water Samples Using Polyurethane Foam 2-(6’-Ethyl-2’-benzothiazolylazo)chromotropic Acid”. Asian Journal of Chemistry 22, no. 5 (March 30, 2010): 3325–3334. Accessed June 30, 2024. https://asianpubs.org/index.php/ajchem/article/view/11551.