Successive determination of praseodymium and ytterbium by coulometric complexometric titration

Journal Article · Tue Jun 01 04:00:00 EDT 1982 · Anal. Chem.; (United States)

OSTI ID:6898838

Chun-Nian, S; Jing-Ci, L; Qi-Dao, N; Mou-Sen, C

A method is described for the successive coulometric complexometric titration of microgram levels of light and heavy rare earth elements. The total amount of light and heavy rare earth elements is titrated by electrogenerating titrant EDTA on the mercury pool as a cathode. Then, the mercury pool is switched as an anode, electrogenerating Hg/sup 2 +/, and is used to titrate EDTA which is displaced from its light rare earth elements complex by malic acid that has been added prior to the electrogenerating Hg/sup 2 +/. The heavy rare earth elements can be determined from the total rare earth elements minus the result of displacement titration of EDTA which is equivalent to the light rare earth elements. A 10-30 ..mu..g sample of light and heavy rare earth elements (Pr and Yb, La and Lu, Nd and Tm) can be determined successively. Errors and standard deviation are not more than 2.5% and 0.20, respectively. 2 tables, 5 figures.

• Research Organization: China Univ. of Science and Tech., Hefei Anhui
• OSTI ID: 6898838
• Journal Information: Anal. Chem.; (United States), Journal Name: Anal. Chem.; (United States) Vol. 54:7; ISSN ANCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
400400 -- Electrochemistry
ACCURACY
AMINO ACIDS
AQUEOUS SOLUTIONS
BUFFERS
CARBOXYLIC ACIDS
CATHODES
CHELATING AGENTS
CHEMICAL ANALYSIS
CHEMISTRY
COMPLEXOMETRY
DATA
DISPERSIONS
EDTA
ELECTROCHEMISTRY
ELECTRODES
ELEMENTS
EQUILIBRIUM
EXPERIMENTAL DATA
HYDROGEN COMPOUNDS
HYDROXY ACIDS
INFORMATION
INORGANIC ACIDS
LANTHANUM
MALIC ACID
MERCURY
METALS
MIXTURES
NEODYMIUM
NITRIC ACID
NUMERICAL DATA
ORGANIC ACIDS
ORGANIC COMPOUNDS
PH VALUE
PRASEODYMIUM
QUANTITATIVE CHEMICAL ANALYSIS
RARE EARTHS
SOLUTIONS
THULIUM
TITRATION
TRACE AMOUNTS
VOLTAMETRY
YTTERBIUM