Citation: Nai Xing WANG. SIMULTANEOUS DETERMINATION OF NEODYMIUM AND PRASEODYMIUM BY ZERO-ORDER AND FOURTH-ORDER DFRIVATIVE SPECTROPHOTOMETRY[J]. Chinese Chemical Letters, ;1991, 2(1): 41-44. shu

SIMULTANEOUS DETERMINATION OF NEODYMIUM AND PRASEODYMIUM BY ZERO-ORDER AND FOURTH-ORDER DFRIVATIVE SPECTROPHOTOMETRY

Nai Xing WANG

Department of Applied Chemistry, Shandong University, Jinan 250100, Shandong, People's Repulic of China

Received Date: 29 April 1990

With derivative spectrophotometric method, the complexes of lanthanides with 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol (5-Br-PADAP) in the presence of octylphenol poly (ethyleneglycol) ether (TX-100) were studied. It is found that the maximum absorption of fourth-order derivative spectra of the neodymium complex by 4f electron transitions is at 579 (+) nm and 582 (-) nm with molar derivative absorptivities of 5.2×10³ l·mol^-1·cm^-1. The maximum absorption of the zero-order derivative spectra of the complexes for neodymium and praseodymium is at 580nm, the molar absorptivities are 1.47×10⁵ l·mol^-1·cm^-1 for Nd and 1.26×10⁵ l·mol^-1·cm^-1for Pr. The component ratio of the complex is Nd:5-Br-PADAP=1:4. Beer's law is obeyed in the range of 0-3.75μg of Nd and Pr in 25ml of solution. The method has been used for the simultaneous determination of Nd and Pr in four synthetic samples and the results obtained are satisfactory.
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