Issue 10, 2011

Kinetic study of the reduction of Cr(vi) in natural water using ion exchange chromatography coupled to inductively coupled plasma mass spectrometry

Abstract

For the first time, a speciation analysis method involving ion exchange chromatography coupled to inductively coupled plasma mass spectrometry was used to perform a kinetic study of Cr(VI) reduction in a certified reference material, SLRS-2, consisting of acidified riverine water. This water sample was spiked with Cr(VI), with or without Cr(III), and evolution of each Cr species as a function of time was monitored by speciation analysis, which showed that the reduction of Cr(VI) was a pseudo first order reaction. By plotting the logarithm of the peak area ratio of the instantaneous Cr(VI) concentration over that of the original spiked concentration versus time, the reaction rate constant was obtained from the slope, and was (2.119 ± 0.040) × 10−4 s−1 in SLRS-2 at pH 1.3 and 20 °C following the addition of 20 μg L−1 Cr(VI). The reduction rate increased with decreasing pH and increasing temperature. The activation energy of the reaction at pH 1.3 was found to be 139.1 ± 7.0 kJ mol−1 using an Arrhenius plot. This method offers the advantages of small sample consumption, minimal sample manipulation, and easy data interpretation.

Graphical abstract: Kinetic study of the reduction of Cr(vi) in natural water using ion exchange chromatography coupled to inductively coupled plasma mass spectrometry

Article information

Article type
Paper
Submitted
05 Feb 2011
Accepted
07 Jun 2011
First published
14 Jul 2011

J. Anal. At. Spectrom., 2011,26, 2006-2011

Kinetic study of the reduction of Cr(VI) in natural water using ion exchange chromatography coupled to inductively coupled plasma mass spectrometry

L. Xing and D. Beauchemin, J. Anal. At. Spectrom., 2011, 26, 2006 DOI: 10.1039/C1JA10042D

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements