Direct determination of bromide ions in sea water by ion chromatography using water as the mobile phase

✍ Scribed by Hu Wenzhi; Cao Shun-an; Mamoru Tominaga; Akira Miyazaki

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 383 KB
• Volume: 322
• Category: Article
• ISSN: 0003-2670
• DOI: 10.1016/0003-2670(95)00573-0

✦ Synopsis

A rapid and simple ion chromatographic (IC) method for the direct determination of bromide (Br-) in sea water was developed. A small amount of sea water was injected into a specific IC system where zwitterionic surfactants immobilized on octadecylsilica CODS) surfaces were used as the stationary phase and water was used as the mobile phase. The matrix ions, SO:-, Cl-, Na+, K+, Mg*+ and Ca*+ were initially eluted as ion pairs of Na+/K+-SO:-, Na+/K+-2Cl-and Mg*+/Ca*+-4CI-before the ion pair Mg*+/Ca*+-4Br-which contained the target ion (Br-). The retention interval between Mg*+/Ca *+-4Br-and Mg*+/Ca*+-4Cl-(the last eluted matrix ion pair) was long enough for the base-line separation of Br-. Bromide ions in sea water could be determined within 4.3 min by using this IC system (a zwitterionic column, 4.6 x 250 mm; a water mobile phase, 1.0 ml/mm; and 20 ~1 of sample injection).