Enhancement of conductometric detection of weak acids in ion chromatography.
Anions of weak acids can represent a problem when determined via chemically suppressed ion chromatography as the acids can be weakly ionised, giving low conductivity and hence low sensitivity. Previous work showed that converting some weak acids back to their sodium salts, using a second micromembrane suppressor, greatly enhanced conductivity and thus sensitivity. This paper will discuss further work in optimising the conversion for boric acid by using sodium salts of EDTA and the mechanisms involved.
Caliamanis
A
A
Department of Applied Chemistry, RMIT University, Melbourne, Victoria, Australia.
McCormick
M J
MJ
Carpenter
P D
PD
D000143:Acids / Q000032:analysis*; D001881:Borates / Q000032:analysis; D001888:Boric Acids / Q000032:analysis; D002852:Chromatography, Ion Exchange / Q000379:methods*; D003217:Conductometry / Q000379:methods; D004492:Edetic Acid / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D008956:Models, Chemical
D000143:Acids; D001881:Borates; D001888:Boric Acids; C010634:sodium borate; D004492:Edetic Acid; C032688:boric acid