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矿物岩石中低含量稀土总量的比色测定,多需经过烦复的分离手续,费时冗长,不能满足野外分析的要求。本文在前人工作的基础上,着重研究了以PMBP-苯直接萃取比色测定总希土时,常常导致分析结果偏低的原因,经试验证明:是于分析过程中产生的氢氧化物或硅胶的吸附以及高价铈离子的水解所致,并提出了如下几点改进:1.矿样经硷熔酸化,在过氧化氢存在下浓缩试液至近干,再以明胶分离硅以消除它的干扰。2.用过氧化氢为还原剂,磺基水杨酸为掩蔽剂,在溶液pH为2.5左右以PMBP-苯预先萃取铁、钛等易水解的干扰元素,继在pH为4.8-5.5的介质中萃取希土。3.采用甲酸溶液两次反萃取,
Colorimetric determination of the total amount of rare earths in mineral rock, after more need to undergo annoying separation procedures, time-consuming and lengthy, can not meet the requirements of field analysis. Based on the previous work, this paper focuses on the direct analysis of PMBP-benzene colorimetric determination of total rare earth, often lead to the analysis of the reasons for the low, the test proved that: the analysis process is generated hydroxide or Silica gel adsorption and high prices of cerium ions caused by the hydrolysis, and made the following improvements: 1. Alkali melting ore samples, concentrated in the presence of hydrogen peroxide solution to nearly dry, and then separated with gelatin to eliminate its silicon interference. 2. Hydrogen peroxide as a reducing agent, sulfosalicylic acid as a masking agent, at a pH of about 2.5 PMBP-benzene pre-extracted iron, titanium and other easily hydrolyzed interference elements, followed by the medium at a pH of 4.8-5.5 In the extraction of soil. 3. Formic acid solution twice back-extraction,