Spectrophotometric Determination of Trace Amounts of Copper (II) Using 5 - (phenyl azo) – 4,6 – dihydroxy -2- mercapto pyrimidine .
journal of kerbala university,
Volume 4, Issue 3, Pages 100-107
AbstractA 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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