Spectrophotometric determination of Micro amount of Cobalt (II) in raw Milk by Using (Antipyriyl azo 1-Nitroso-2-naphthol) as New reagent | ||
| Almuthanna Journal of Pure Science (MJPS) | ||
| Article 1, Volume 2, Issue 1, December 2014, Pages 0-0 | ||
| Authors | ||
| ; | ||
| Abstract | ||
| A new , simple , sensitive and rapid spectrophotometric method is proposed for the determination of trace amount of cobalt (II) . The method is based on the formation of a 2:1 complex with 3-(4′- antipyriyl azo) 1- nitroso-2- naphthol (APAN) as a new reagent is developed . The complex has a maximum absorption at 432 nm and εmax of 3.3 X 104 L. mol-1. cm-1 . A linear correlation (0.1 – 2.5 μg. ml-1) was found between absorbance at λmax and concentration . The accuracy and reproducibility of the determination method for various known amounts of cobalt (II) were tested . The results obtained are both precise (RSD was better than 0.60 % ) and accurate (relative error was better than 0.2 % ) . The effect of diverse ions on the determination of cobalt (II) to investigate the selectivity of the method were also studied . The stability constant of the product was 1.0 X 108 L. mol-1 . The proposed method was successfully applied to the analysis of synthetic mixtures and raw milk without any preliminary concentration or separation. | ||
| Keywords | ||
| cobalt; spectrophotometry; antipyriyl azo; nitroso; naphthol; milk raw | ||
|
Statistics Article View: 92 PDF Download: 66 |
||