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Synthesis and Spectrophotometric Study of 4-(6- Bromobenzothiazolylazo)Orcinol as an Analytical Reagent for Determination of Copper | ||
| Iraqi National Journal Of Chemistry | ||
| Article 1, Volume 0, Issue 47, 2014, Pages 281-292 | ||
| Authors | ||
| Shaima Mouhsen; Kasim H. Kadhim | ||
| Abstract | ||
| Abstract The new azo reagent 4-[ (6-Bromo-2-benzothiazolyl ) azo] orcinol (6-BrBTAO) was prepared by coupling reaction between (6-bromo-2-benzothiazolyl diazonium ) chloride with orcinol in alkaline solution. The reagent was examined by using elemental analysis, UV-Vis, and infrared spectra. A sensitive and selective spectrophotometric method is proposed for the rapid determination of copper (II) using (6-BrBTAO), as anew spectrophotometeric reagent. The reaction between this reagent and copper (II) is instantaneous at 497 nm (λmax) and pH=4 to form red complex having a mole ratio 1 : 2 (metal : ligand) and the absorbance remains stable for over 24 hr. Beer's law is obeyed in the range of (5-30) μg.ml-1 with molar absorptivity (Є) = 149×103 L.mol-1.cm-1and a detection limit of 0.355μg.ml-1 The precision and accuracy were obtained to be R.S.D%=0.59%,Re%=99.94% and Erel%= -0.006%.The method is successfully employed for the determination of copper(II) in Amalgum dental filling Sampels .The most important interference were due to Ni2+, Zn2+, Co2+, Cd2+, Pb2+, Ag1+, and Cr3+ and suitable masking agents were used. | ||
| Keywords | ||
| Thiazolylazo; Spectrophotomitric determination of Cupper | ||
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