A procedure was developed for the clean-up of gastric juice and urine specimens for nitrite and nitrate analysis by ion chromatography. After dilution with deionized water, the sample is passed through two solid-phase extraction columns (C18 and IC-Ag∗) connected in series. Nitrite and nitrate are eluted off the column and the sample is ready for analysis. This treatment of the samples eliminates any particles, organics and interfering chloride ions.
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Utermahlen et al. (1992) studied this question.
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