摘要
We have found a sensitive color reagent for rare earths. Up to now p-bromoarsenazo is the most sensitive color reagent for rare earth. This paper has systematically researched into the color reactive conditions, i.e. with Mn-EDTA ligand as buffer solution. This method can determine cerium subgroup rare earths in the presence of yttrium subgroup with the lower limit of 0.1 ppm.
