ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Influence of solution composition and iron powder characteristics on reduction of 2,4,6-trinitrophenol

Daniela Kladeková and Mária Heželová

Institute of Chemistry, Faculty of Science, P. J. Šafárik University in Košice, SK-041 54 Košice, Slovak Republic

E-mail: maria.hezelova@tuke.sk

Received: 3 December 2007  Revised: 8 April 2008  Accepted: 22 April 2008

Abstract: Kinetics of the 2,4,6-trinitrophenol reaction with iron powder was investigated voltammetrically. The process was found to be mainly governed both by the iron powder characteristics and by the solution composition. Degradation kinetics was generally represented by a pseudo-first-order rate law. Consecutively, the 2,4,6-trinitrophenol reduction reaction rates for three fractions of iron powder as well as the effect of individual ions presented in the reaction system were evaluated. A correlation between the reaction rate and both the grain size of iron particles and the state of their surface was found. The effect of the reaction system composition was investigated for two types of buffered medium: Britton-Robinson buffer (boric acid, orthophosphoric acid, and glacial acetic acid) and acetate buffer solution (sodium acetate and acetic acid).

Keywords: kinetics - 2,4,6-trinitrophenol - reduction - iron powder - buffer composition - voltammetry

Full paper is available at www.springerlink.com.

DOI: 10.2478/s11696-008-0075-2

Chemical Papers 62 (6) 553–558 (2008)