论文部分内容阅读
稀土氧化物中含有大量的稀土及少量的钙、镁、硅、铁和铀、钍等。我们在彭志恒等工作基础上,采用在pH3时以磺基水杨酸掩蔽铁、铝,PMBP-苯萃取铀钍与大量稀土等干扰元素分离。然后,2%盐酸反萃铀,4N盐酸反萃钍。在pH3时,用抗坏血酸还原铁(Ⅲ),用EDTA掩蔽微量稀土和钍,用偶氮胂(Ⅲ)法测定铀。在3～4N盐酸中用草酸掩蔽微量稀土和锆,抗坏血酸还原铁(Ⅲ),偶氮胂(Ⅲ)法测定微量钍。
Rare earth oxides contain a large amount of rare earth and a small amount of calcium, magnesium, silicon, iron and uranium, thorium and so on. Based on our work such as Peng Zhiheng, we separated the interfering elements such as iron, aluminum, PMBP-benzene extracted uranium-thorium and a large amount of rare earths by using sulfosalicylic acid at pH3. Then, 2% hydrochloric acid stripping uranium, 4N hydrochloric acid stripping thorium. At pH 3, iron (III) was reduced with ascorbic acid, trace amounts of rare earth and thorium were masked with EDTA, and uranium was measured with the arsenazo (III) method. Trace rare earth thorium with oxalic acid in 3 ~ 4N hydrochloric acid to mask rare earth and zirconium, reducing iron ascorbate (Ⅲ) and arsenazo (Ⅲ) method.