Library Open Repository

New conductivity detection response equation for anions eluted with fully and partially ionised eluents in non-suppressed ion chromatography

Downloads

Downloads per month over past year

Haddad, PR and Shaw, MJ and Dicinoski, GW (2002) New conductivity detection response equation for anions eluted with fully and partially ionised eluents in non-suppressed ion chromatography. Journal of Chromatography A, 956 (1-2). pp. 59-64. ISSN 0021-9673

[img] PDF
285.pdf.pdf | Request a copy
Registered users only
Available under University of Tasmania Standard License.

Abstract

A response equation for conductivity detection in ion chromatography has been derived. This equation is applicable to non-suppressed ion chromatography using both fully ionised and partially ionised eluents. A prime assumption of this equation is that when partially ionised eluents are used (such as benzoic acid), both the ionised and neutral components of the eluent species contribute to the detector response of anionic analytes. Experimental evidence is provided to support this assumption in that pH changes accompanying the elution of an analyte have been measured. These pH changes are proportional to the concentration of analyte injected onto the column, in accordance with predictions from the response equation. Furthermore, it is shown that protonated eluents (such as benzoic acid) give more sensitive detection than equivalent ionised eluents (such as potassium benzoate) and the signal enhancement achieved using a protonated eluent species is in accordance with theory.

Item Type: Article
Keywords: Inorganic anions; Benzoic acid; Conductivity detection; Detection, LC; Ion chromatography
Journal or Publication Title: Journal of Chromatography A
Page Range: pp. 59-64
ISSN: 0021-9673
Identification Number - DOI: 10.1016/S0021-9673(02)00315-1
Additional Information: The definitive version is available at http://www.sciencedirect.com
Date Deposited: 20 Oct 2008 22:08
Last Modified: 18 Nov 2014 03:52
URI: http://eprints.utas.edu.au/id/eprint/7834
Item Statistics: View statistics for this item

Repository Staff Only (login required)

Item Control Page Item Control Page