中文摘要：

为探究不经分离直接定量分析含有钍、镧等元素混合物中的铀，以偶氮肿Ⅲ为显色剂，建立了酸度-光谱双线性数据矩阵秩消失因子分析法。结果表明，当pH=0．3～4．8，A为600～680nm时，方法的检出限为0．085mg／L；当混合物中铀的质量浓度为1．19～4．76mg／L时，相对标准偏差为1．5％～4．2％。用该方法对实际样品进行了测定，加标回收率为97．5％～103．4％。

英文摘要：

For searching direct quantitative analysis of uranium in grey mixtures containing thorium and lanthanum without any separate process, a rank annihilation factor analysis of the acidity-spectra bilinear data matrices with arsenazo Ⅲ as a chromogenic reagent was established. The range of acidity is pH=0.3-4.8 and the range of wavelength is 600-680 nm in the process of measure. The results show that the detection limit of the method is 0. 085 mg/ L and the relative standard deviations are from 1.5 % to 4.2 % when the mass concentrations of uranium in the mixtures are from 1.19 mg/L to 4.76 mg/L. The method was used for the determination of uranium in real mixtures with recoveries of standard added from 97.5% to 103.4%.