ION CHROMATOGRAPHY MEASURING METHOD AND ITS DEVICE

PURPOSE:To improve analytic sureness and realize simple measuring by removing coexisting opposition electric charge ions at the front step of an enrichment column. CONSTITUTION:The 1st and 2nd six-way valves 20, 21 are set at the route of a solid line. A sample solution 10 is delivered by means of a liquid delivering pump 14 to a positive ion removing column 17 via the valve 20, and only positive ions in the solution 10 are adsorbed and removed therein, and the solution 10 containing negative ions alone is delivered to a negative ion enrichment column 18 via valves 20, 21. Negative ions are adsorbed therein, and the enrichment of negative ions is conducted by continuing to let the solution 10 flow for a fixed time. The solution 10 that has passed the column 18 is discharged from a waste liquid drain 24 via the valve 21. During this time, an eluate 11 is delivered to a negative ion separation column 19 and the inside of it is washed. After the solution 10 is enriched for a fixed time, valves 20, 21 are switched over to the route shown by dotted lines. The eluate 11 is delivered to the column 18 through the valve 21, and enriched negative ions are conducted with elution and delivery to the column 19 via the valve 21 is carried out. The separation of this is conducted at the column 19 and delivery to a detection portion 23 is carried out, and analysis is conducted therein.