Multicycle loop injection for trace analysis by ion chomatograph

Details Multicycle loop injection for trace analysis by ion chomatograph Multicycle loop injection for trace analysis by ion chomatograph

1997-05-15

1998-09-01

Brock, Michael

Measuring and testing

Liquid analysis or analysis of the suspension of solids in a...

Content or effect of a constituent of a liquid mixture

G01N 3004

Patent

active

058013024

ABSTRACT:
An ion chromatographic apparatus and method for on-column preconcentration of trace ionic contaminants for quantitative trace analysis by ion chromatography. The method includes the multi-cycle, sequential steps of loading and purging of sample solution into and out of a sample injection loop to cumulatively preconcentrate a separator column with a cumulative amount of sample. Each purging step includes directing pressurized liquid, at a substantially constant rate and for a predetermined period of time to the sample injection loop, to drive up to about 98% of the known volume of the sample solution from the sample injection loop. In turn, this flushed volume of sample solution passes through an ion exchange resin column for concentration of the trace ionic contaminants in the resin.

REFERENCES:
patent: 3975946 (1976-08-01), Ball et al.
patent: 4102179 (1978-07-01), Snell
patent: 4699718 (1987-10-01), Jones et al.
patent: 4775476 (1988-10-01), Melcher et al.
patent: 4981804 (1991-01-01), Hanaoka et al.

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