Abstract
Detection by post suppression ion exchange, as an adjunct to suppressed hydroxide eluent ion chromatography, involves exchange of eluting sample anion or concurrently present H/sup +/ for a fluorescent/optically absorbing anion or cation such as anthranilate or Ce/sup 3 +/. Membrane-based post suppression devices permit reliable continuous operation, and detection limits can be better than those attainable by conductivity detection. The anion exchange membrane-anthranilate system also yields excellent detection limits by UV absorption except that membrane degradation is a problem. The ion exchange at the membrane interface is not an equilibrium process. The dependence of the membrane response on an external high frequency electrical field suggests that the transport of the ions through the membrane is not a rate-determining factor.
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