Solving complex anion separation problems with a carbonate-hydrogencarbonate gradient.
This paper describes the application of a new suppressor to solve complex anion separation problems with carbonate-hydrogencarbonate gradients. In addition to suppressing the mobile phase and enhancing the analyte signal like any other ion chromatography suppressor, the new DS-Plus suppressor removes carbonic acid from the suppressor effluent when carbonate-hydrogencarbonate mobile phases are used. This greatly reduces the background signal, enabling carbonate-hydrogencarbonate gradients. Since carbonate-hydrogencarbonate mobile phase has stronger eluting power than hydroxide or tetraborate, only dilute concentrations are needed to separate most anions. By adjusting the carbonate-hydrogencarbonate ratio in the mobile phase, various anion mixtures including those containing organic and inorganic anions with -1 to -3 charges can be separated on one or two columns, eliminating the needs for columns with special selectivity.
Bose
Rakesh
R
Alltech Associates Inc, Deerfield, IL 60015-1899, USA. rbose@alltechemail.com
Saari-Nordhaus
Raaidah
R
Anderson
James M
JM
D000838:Anions / Q000302:isolation & purification*; D001639:Bicarbonates / Q000737:chemistry*; D002254:Carbonates / Q000737:chemistry*
D000838:Anions; D001639:Bicarbonates; D002254:Carbonates