Citation: Guo Zhen FANG, Jiao PAN, Wei Liang AHOU, Bu Lu XU. Study on the Spectrophotometric Determination of Rare Earths with a New Chromogenic Reagent Dibromo-p-methyl-chlorosulfonazo(DBMCSA)[J]. Chinese Chemical Letters, ;1999, 10(10): 851-854. shu

Study on the Spectrophotometric Determination of Rare Earths with a New Chromogenic Reagent Dibromo-p-methyl-chlorosulfonazo(DBMCSA)

Deparment of Chemistry East China Normal University 3663 Zhongshan Road (N) Shanghai 200062

Received Date: 14 May 1999

A new method for the determination of cerium subgroup rare earths was studied and reported in this paper. It was found that cerium subgrouo rare earth elements react with DBMCSA in 0.6 mol/L hydrochloric acid medium to form stable blue complexes. absorbances of eyual amounts of cerium subgroup rare earths are close to each other at their maximum adsorptive wavelength (641 nm). Beer's law is obeyed for 0-20 μg of rare earths in 25 ml of solution. The method has been applied to the determination of the total amount of cerium subgroup rare earths in steel and cast iron samples with satisfactory results.
- Spectrophotometric detemination,
- rare earths,
- dibromo-p-methyl-chlorosulfonazo(DBMCSA)
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