Patent ID: 7682506

Claim:
Ion chromatography apparatus comprising: (a) a liquid sample injection loop having an inlet and an outlet, (b) an ion concentrator including an inlet and an outlet and ion concentration medium for retaining ionic species, (c) an ion separator comprising ion separation medium, (d) an eluent generator including an inlet and an outlet, (e) a single pump only in said apparatus, and (f) valving including the following modes: (1) a first mode in which flow is blocked between said sample loop outlet and said concentrator inlet, said eluent generator outlet is in fluid communication with said ion concentrator inlet and said ion separator inlet, and said pump is in fluid communication with said eluent generator inlet; and (2) a second mode in which said sample loop outlet is in fluid communication with said ion concentrator inlet, and said ion concentrator outlet is in fluid communication with said eluent generator inlet.