Patent ID: 8062515
Filing Date: 2011-11-22
Classification: G01N

Abstract:
1. An analytical apparatus for analyzing ionic species comprising (a) a pretreatment device for pretreating an aqueous sample stream comprising a plurality of ionic species to be detected and at least one matrix compound for removing at least part of the matrix ions of such matrix compound, said matrix ions being of opposite charge to said ionic species, and replacing said matrix ions with hydroxide or hydronium ions, said pretreatment device including (b) a separator comprising chromatographic medium for separating the ionic species in said pretreated sample stream in fluid communication with said sample compartment outlet, and (c) a detector for detecting said separated ionic species in fluid communication with said separator, (d) a pump for transporting aqueous sample through said pretreatment device, and (e) a timing controller for turning off said pump or switching a valve in communication with said pretreatment device for a predetermined duration related to the desired extent of replacement of said matrix ions in said aqueous sample.