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Spectrophotometric Determination of Trace Amounts of Copper (II) Using 5 - (phenyl azo) – 4,6 – dihydroxy -2- mercapto pyrimidine . | ||
| journal of kerbala university | ||
| Article 1, Volume 4, Issue 3, 2008, Pages 100-107 PDF (0 K) | ||
| Authors | ||
| Majed . J .Mohammed; Hussain . J . Mohammed; Raad . K . Al-Sabaag | ||
| Abstract | ||
| A new , simple , sensitive and rapid spectrophatometric method is proposed for the determination of trace amounts of copper (II) . The method is based on the formation of a 1 : 2 complex with 5- (phenyl azo) – 4,6 – dihydroxy -2- mercapto pyrimidine (PDMP) as a new reagent is developed . The complex has a maximum absorption at 490 nm and εmax of 0.85 × 104 L . mol-1 cm-1 . A linear correlation (0.2-3 μg /ml) was found between absorbance at λmax and concentration . The accuracy and reproducibility of the determination method for various known amounts of copper (II) were tested . The results obtained are both precise (RSD was better than 0.50%) and accurate (relative error was better than 0.21%) the effect of diverse ions on the determination of copper (II) to investigate the selectivity of the method were also studied . The stability constant of the product under optimized conditions and at room temperature was 1.43×1010 l.mole-1 The method was applied to the determination of Cu (II) ion in some standard practical samples . Key Words : 5- (phenyl azo) – 4 , 6 –dihydroxy -2- mercapt pyrimidine , Copper (II) determination , Spectrophotometry | ||
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