| 摘 要： | With derivative spectrophotometric method,the complexes oflanthanides with 2-(5-bromo-2-pyridylazo)-5-diethylaminophen-ol(5-Br-PADAP)in the presence of octylphenol poly(ethyleneg-lycol)ether(TX-100)were studied.It is found that the maximumabsorption of fourth-order derivative spectra of the neodymiumcomplex by 4f electron transitions is at 579(+)nm and 582(-)nmwith molar derivative absorptivities of 5.2×10~3 1.mol~(-1).cm~(-1).The maximum absorption of the zero-order derivative spectra ofthe complexes for neodymium and praseodymium is at 580hm,themolar absorptivities are 1.47×10~5 l.mol~(-1).cm~(-1)for Nd and 1.26×10~5 l.mol~(-1).cm~(-1)for Pr.The component ratio of the complexis Nd:5-Br-PADAP=1:4.Beer's law is obeyed in the range of0-3.75μg of Nd and Pr in 25ml of solution.The method has beenused for the simultaneous determination of Nd and Pr in foursynthetic samples and the results obtained are satisfactory.
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