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ION EXCHANGE‐FLOW INJECTION SPECTROPHOTOMETRIC SIMULTANEOUS DETERMINATION OF TRACES OF BROMIDE AND IODIDE IN SOME CHINESE STANDARD SAMPLES
Author(s) -
LIU Guojun,
LI Jinxin,
ZHAO Xiumei
Publication year - 1995
Publication title -
geostandards newsletter
Language(s) - English
Resource type - Journals
eISSN - 1751-908X
pISSN - 0150-5505
DOI - 10.1111/j.1751-908x.1995.tb00159.x
Subject(s) - iodide , bromide , chemistry , hydrogen peroxide , elution , ion exchange , nitric acid , flow injection analysis , inorganic chemistry , iodine , ion chromatography , potassium bromide , detection limit , chromatography , ion , organic chemistry
An ion exchange flow injection method is presented for the simultaneous determination of bromide and iodide based on the catalytic reaction during the oxidation of Pyrocatechol Violet by hydrogen peroxide in strongly acid solution. Bromide and iodide in sample solutions are concentrated when they flow through the ion exchange column; they are removed and separated with sodium nitrate eluant flowing through the column, and are monitored spectrophotometrically at 555 nm. All possible anionic interferences were studied. The procedure has been applied successfully to the determination of bromide and iodide in some Chinese standard reference samples. The limits of detection are 0.2 ppm and 0.4 ppm of bromide and iodide respectively in soils and stream sediments.