Online Trace Enrichment and Determination of Cobalt Ion as an Anionic Complex by Flow Injection Atomic Absorption Spectrometry

✍ Scribed by Shayessteh Dadfarnia; Mohammad Hossein Jafarzadeh

• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 56 KB
• Volume: 63
• Category: Article
• ISSN: 0026-265X
• DOI: 10.1006/mchj.1999.1785

✦ Synopsis

A flow injection system incorporating a microcolumn of activated alumina was combined with atomic absorption spectrometry for on-line trace enrichment and determination of cobalt in waters and vitamin B 12 . Deposition of cobalt as its cyano complex was effected with the use of an acidic alumina microcolumn, and injection of ammonia solution (500 l, 2 M) served to elute species retained on the atomic absorption spectrometer. A sample volume of 15 ml resulted in a preconcentration factor of 120, and precision at the 500 and 50 g liter Ϫ1 levels was Ϯ3.1 and Ϯ3.3% (RSD), respectively. The procedure was applied to mineral water, spring water, river water, and vitamin B 12 and accuracy was assessed through a recovery experiment.