Successive determination of praseodymium and ytterbium by coulometric complexometric titration
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), Vol. 54:7
- Country of Publication:
- United States
- Language:
- English
Similar Records
PART I. THE STEPWISE TITRATION OF Fe(III) AND Fe(II) WITH EDTA AND FERRICYANIDE. THE SQUARE WAVE TITRIMETRIC END POINT. PART II. THE POLAROGRAPHY OF RARE EARTH METAL IONS IN ANHYDROUS ETHYLENEDIAMINE
CONSTANT CURRENT SOURCE FOR AUTOMATIC COULOMETRIC TITRATIONS
Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
LANTHANUM
TITRATION
NEODYMIUM
PRASEODYMIUM
THULIUM
YTTERBIUM
ACCURACY
AQUEOUS SOLUTIONS
BUFFERS
CATHODES
COMPLEXOMETRY
EDTA
ELECTROCHEMISTRY
EQUILIBRIUM
EXPERIMENTAL DATA
MALIC ACID
MERCURY
NITRIC ACID
PH VALUE
QUANTITATIVE CHEMICAL ANALYSIS
TRACE AMOUNTS
VOLTAMETRY
AMINO ACIDS
CARBOXYLIC ACIDS
CHELATING AGENTS
CHEMICAL ANALYSIS
CHEMISTRY
DATA
DISPERSIONS
ELECTRODES
ELEMENTS
HYDROGEN COMPOUNDS
HYDROXY ACIDS
INFORMATION
INORGANIC ACIDS
METALS
MIXTURES
NUMERICAL DATA
ORGANIC ACIDS
ORGANIC COMPOUNDS
RARE EARTHS
SOLUTIONS
400201* - Chemical & Physicochemical Properties
400400 - Electrochemistry