Detectors

Abstract

71 Conductivity Detectorsanion-exchange column (with a high pH eluent), it is only possible to detect the stronger acid, arsenate, by suppressed conductivity, and is not possible to detect the weak acid, arsenite. Other anions that cannot be detected by suppressed conductivity detection include borate, silicate and cyanide. Nonsuppressed, single-column methods, selective detection, or post-column reaction methods are required for the detection of salts of weak acids. Table 4.1 Limiting equivalent ionic conductances in aqueous solution at 25°C. (Units: S cm 2 equiv -1 ) Anions k -Cations k +