COMPLEXOMETRIC TITRATION OF YTTRIUM AND THE LANTHANONS. II. METHODS FOR THEIR DETERMINATION IN OXALATES
Complexometric methods for the determination of yttrium and the lanthanons in oxalate precipitates were investigated. In the method recommended, excess EDTA is added to a suspension of the oxalate, and solution is effected at pH 10 with ammonia-ammonium chloride buffer. The excess EDTA is titrated with standard zinc solution to the blue to red color change of Eriochrome Black T indicator. It is more convenient, and generally more satisfactory, than the method previously suggested, in which magnesium is the back-titrant at pH 10.2 to 10.5. Both of the methods are superior to the back-titration with lanthanum using Arsenazo as indicator at pH 8 to 9 in the presence of oxalate, and more convenient than methods in which the oxalate is removed by wet oxidation before titrating directly with EDTA. The zinc titration method is particularly suitable for chemical-yield measurement in radiometric determinations of yttrium and lanthanons precipitated as oxalates for counting purposes. (auth)
- Research Organization:
- Univ. of Durham, Durham City, Eng.
- NSA Number:
- NSA-18-001584
- OSTI ID:
- 4147127
- Journal Information:
- Talanta (England), Journal Name: Talanta (England) Vol. Vol: 10; ISSN TLNTA
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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Related Subjects
AMMONIA
AMMONIUM COMPOUNDS
ARSENAZO
CHEMISTRY
CHLORIDES
COMPLEXES
DYES
EDTA
EFFICIENCY
ERIOCHROME DYES
HYDROXIDES
MAGNESIUM
NAPHTHALENE
ORGANIC NITROGEN COMPOUNDS
ORGANIC SULFUR COMPOUNDS
OXALATES
PHENYL RADICALS
PRECIPITATION
QUALITATIVE ANALYSIS
QUANTITATIVE ANALYSIS
RARE EARTHS
SOLUTIONS
STANDARDS
TITRATION
YTTRIUM
ZINC