||Determination of Carboxylic Acids by Ion-Exclusion Chromatography with Non-Suppressed Conductivity and Optical Detectors.
Ye, M. ;
Hill, K. ;
Walkup, R. ;
||ManTech Environmental Technology, Inc., Ada, OK.;Robert S. Kerr Environmental Research Lab., Ada, OK.
Carboxylic acids ;
Chromatographic analysis ;
Ultraviolet detectors ;
Ion exclusion chromatography
||Some EPA libraries have a fiche copy filed under the call number shown.
Determination of carboxylic acids by ion exclusion chromatography using non-suppressed conductivity and UV detections is described. The background conductance of 1-octanesulfonic acid, hexane sulfonic acid and sulfuric acid at varying concentrations was determined. Using 0.2 mM 1-octanesulfonic acid as a mobile phase and an injection volume of 300 microliters, the detection limits range from 1 micromolar for formic acid to 10 micromolar for butyric acid. The conductivity detector was connected in tandem with a Waters 484 optical detector at 210 nm, which allowed the analysis of carboxylic acids from 0.01 mM to 10 mM. The dependence of the retention of carboxylic acids on the eluent pH is discussed.