Pimchaya Vatjanarat และ Kowit Piyamongkala. (2017) Adsorption of copper and lead ions by chitosan powder and sodium tripolyphosphate-modified chitosan resin: Kinetics, mechanism and mass transfer. <i>NARESUAN UNIVERSITY ENGINEERING JOURNAL</i>, <i>12</i>(1), 83-96.Pimchaya Vatjanarat และ Kowit Piyamongkala. "Adsorption of copper and lead ions by chitosan powder and sodium tripolyphosphate-modified chitosan resin: Kinetics, mechanism and mass transfer". NARESUAN UNIVERSITY ENGINEERING JOURNAL 12 (2017):83-96.Pimchaya Vatjanarat และ Kowit Piyamongkala. Adsorption of copper and lead ions by chitosan powder and sodium tripolyphosphate-modified chitosan resin: Kinetics, mechanism and mass transfer. Faculty of Engineeing Naresuan University:ม.ป.ท. 2017.