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Spectrophotometric Determination of Silver(I) and Chromium(VI) by Using 2 – [ ( 6 – Nitro – 2 – Benzothiazolyl ) azo] – 4 , 5 –diphenyl imidazole As Analytical Reagent | ||
| journal of al-qadisiyah for pure science(quarterly) | ||
| Article 1, Volume 13, Issue 4, 2013, Pages 213-227 PDF (0 K) | ||
| Author | ||
| Azhar A. Ghali | ||
| Abstract | ||
| A simple , rapid and sensitive spectrophotometric method for the determination of silver(I) and chromium(VI) ions by using 2 – [ ( 6 – Nitro – 2 – Benzothiazolyl ) azo] – 4 , 5 – diphenyl imidazole (6 – NO2 BTADI) as complexing reagent. The (6 – NO2 BTADI) reagent gives intense pink colour when react with these in acetate buffer solution. The maximum absorbance observed at 566 nm and 570 nm for Ag(I) and Cr(VI) respectively. The molar absorptivity and sandell’s sensitivity for silver(I) and chromium(VI) complexes are 0.4898 × 104, 0.1182 × 104 L.mol-1.cm-1 and 0.0220, 0.0440 μg/cm2 respectively. The stability constant of 1:1 [M:L] complexes of Ag(I) and Cr(VI) are 0.3456 × 106 and 0.0796 × 106 L.mol-1 respectively. The linear range of 0.2-12.5 µg mL-1, 0.8-30 µg mL-1 along with limit of detection 0.11 µg mL-1, 0.77 µg mL-1 , relative standard deviation for seven replication measurements (4 µg Ag mL-1 and 15 µg Cr mL-1 ) of ( 1.30% ) and (1.62% ) ,and the recovery range of (99) and ( 97.54 ) were obtained for Ag(I) and Cr(VI) ions respectively. The developed method was applied for the determination of Ag(I) and Cr(VI) in spiked water samples. | ||
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