Spectrophotometric Determination of Cobalt (II) Using 4-(6-Bromo 2-benzothiazolylazo) Orcinol as an Organic Reagent | ||
| Iraqi National Journal Of Chemistry | ||
| Article 1, Volume 0, Issue 53, November 2014, Pages 11-19 | ||
| Author | ||
| Azhar A. Ghali | ||
| Abstract | ||
| Abstract A sensitive, simple and selective spectrophotometric method was proposed for the rapid determination of cobalt(II) using 4-(6-Bromo 2-benzothiazolylazo) Orcinol(6-BrBTAO). Alcoholic solution of 6-BrBTAO form a 1:2 pink complex with cobalt(II) ions at pH ranges 5.0-10.0, absorbing maximum at 514 nm. The molar absorptivity and the Sandell’s sensitivity of the complex are 2.574x103L mol-1cm-1 and 0.022μg.cm-2 respectively. . Under the optimum established conditions, which led to a detection limit of 0.51 µg.mL-1 of Co (II) and concentration range of 0.7-30 µg.mL-1 with percent recovery of 100.43±1.23. The precision for seven replicate measurements of 15 µg.mL-1 Co(II) was of 1.7%. The method was applied to the determination of cobalt in some vegetables samples such as radish, carrot and spinach with satisfactory results. | ||
| Keywords | ||
| Bromo; benzothiazolylazo; cobalt; Vegetables samples; Spectrophotometry | ||
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