Desorption kinetics and leaching study of arsenic from arsenite/arsenate-loaded Natural Laterite. (11th February 2010)

• Record Type: Journal Article
• Authors: Maiti, Abhijit; Basu, Jayanta Kumar; De, Sirshendu
• Is Part Of: International journal of environmental technology and management. Volume 12:Number 2-4(2010)
• Page Start: 294
• Page End: 307
• Publication Date: 2010-02-11
• Subjects: arsenic desorption -- synthetic leachate -- TCLP -- toxicity characteristic leaching procedure -- laterite leaching -- leachability index -- desorption kinetics -- adsorption; Environmental management -- Periodicals; Green technology -- Periodicals; 333.705
• Languages: English
• ISSNs: 1466-2132

Abstract

Desorption kinetics of arsenite- and arsenate-loaded Natural Laterite (NL) is performed under varying NaOH concentration (0.05-0.3 mol/L) and pH (4.0-11.0) of the desorption medium. The kinetic desorption data are well fitted to pseudo-second order kinetic model. The leaching of NL under aqueous medium is performed in the pH range of 2-12. Separately arsenite- and arsenate-loaded NL is leached according to Toxicity Characteristic Leaching Procedure (TCLP) protocol. However, recent studies indicate that TCLP significantly underestimate the leaching behaviour of arsenic. So, arsenic leaching from arsenic-loaded NL is conducted under synthetic leachate condition and results are compared with TCLP results.