多卤代变色酸双偶氮胂类显色剂与锆显色反应的研究及应用

SPECTROPHOTOMETRIC STUDY OF COMPLEXATION OF TRIBROMO-ARSONOAZO(TBA),DIBROMO-CHLOROARSONOAZO(DBCA),DICHLORO-BROMOARSONOAZO(DCBA)AND TRICHLOROARSONAZO(TCA)WITH ZIRCONIUM AND ITS APPLICATIONS

研究了系列不对称变色酸试剂TBA,DBCA,DCBA,TCA和Zr的显色反应。在0.5mol/L HCl中,室温下Zr与试剂反应快速,试剂及Zr的配合物分别在525—535nm和632—635nm有最大吸收,摩尔吸光系数为ε=4.56～5.10×10~4。Zr与试剂配合比为1:2,稳定常数K′=1.37—1.94×10~4,其中的TBA和DBCA用于测定钢铁及Cu,Al,Mg合金中Zr,获得满意结果。

The colour reactions of a series of reagents, TBA, DBCA, DCBA and TCA of asymmetric chromotropic acid, with Zr were studied in 0.50N HCl at room temperature. The reaction took place quick. The reagents and complexes of Zr have maximum absorption at 525—535 and 632—635nm respectively. The molar absorptivity is 4.56—5.1×10~4 (ε). The molar ratio of Zr to reagents is 1∶2. The stability constant of complexes is 1.37—1.94×10^(12). TBA and DBCA in these reagents can be used to the determination of Zr in iron and steel, and in the alloys of Cu, Al and Mg with good results.