Abstract
A hollow-fibre membrane-based sample preparatin device was investigated for the removal of chloride from brine samples prior to ion chromatograhic analysis. A device consisting of 150 cm of sulphonated Dupont Nafion® fiber immersed in a counter-ion donating solution of 0.050 M silver p-toluenesulphonate can remove greater than 99% of chloride and bormide in a sample while givnig quantitative recoveries for other inorganic anions of interest. This sample pretreatment approach combined with conventional non-suppressed ion chromatography using conductivity detection gives a detection limit for nitrite of approximately 0.1 ppm in brine samples containing up to 5000 ppm chloride.
Published Version
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