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- W205337322 abstract "A modified automated preconcentration system for non-suppressed ion chromatography is described which uses a microprocessor-controlled pump coupled to a low-pressure switching valve and two high-pressure switching valves. This system is applicable to conductivity detection because it permits the concentrator pre-column to be removed from the flow path after elution of adsorbed ions onto the analytical column, and also allows the concentrator column to be washed with a small volume of eluent prior to elution. Both of these steps serve to minimise baseline perturbations in the final chromatogram resulting from disequilibration of the concentrator column due to the loss of bound eluent ions during the sample loading process. It is shown that both steps are necessary for quantitative removal of adsorbed sample from the concentrator column and that the efficiency of sample loading is strongly dependent on the type of eluent used to equilibrate the concentrator column. Under optimal conditions, recoveries of preconcentrated samples varied from 99 to 106% for 50 ppb of chloride, nitrate and sulphate, when compared with manual injection of equivalent amounts of these ions." @default.
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- W205337322 date "1985-01-01" @default.
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- W205337322 title "Studies on sample preconcentration in ion chromatography" @default.
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- W205337322 doi "https://doi.org/10.1016/s0021-9673(01)81966-x" @default.
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