DETERMINATION OF THORIUM IN ORES

Journal Article · Wed Mar 01 04:00:00 EST 1961 · Chishitsu Chosasho Geppo (Japan)

OSTI ID:4818988

Sekine, S; Mochizuki, T

A procedure for the determination of thorium in ores is as follows: The sample is decomposed with perchloric and hydrofluoric acids and is dissolved in hydrochloric acid. The residue is reserved. Sodium hydroxide precipitation is made and the precipitate is dissolved in nitric acid (solution A). The reserved residue is then used with sodium peroxide and sodium carbonate (1 + 1). The melt is treated with water, and the precipitate is dissolved in nitric acid (solution B). (A) + (B) is treated with ammonia and the precipitate is dissolved in nitric acid. The solution is diluted to 10 ml (containing 1.5 ml of free acid) and EDTA is added (0.1 g of EDTA for 25 mg of ZrO/sub 2/), followed by 19 g of crystal aluminum nitrate. The solution is extracted with mesltyl oxide, and thorium is transferred to the aqueous phase by shaking the extract with water. Thorium is then titrated with a standard solution of EDTA using xyenol orange as an indicator, or determined by spectrophotometry with arsenazo (580 m mu ). (auth)

• Research Organization: Originating Research Org. not identified
• NSA Number: NSA-16-007510
• OSTI ID: 4818988
• Journal Information: Chishitsu Chosasho Geppo (Japan), Journal Name: Chishitsu Chosasho Geppo (Japan) Vol. Vol: 12; ISSN CHCGA
• Country of Publication: Country unknown/Code not available
• Language: Japanese

Related Subjects

ACIDITY
ALUMINUM NITRATES
AMMONIA
ARSENAZO
CHEMISTRY
DECONTAMINATION
DYES
EDTA
HYDROCHLORIC ACID
HYDROFLUORIC ACID
HYDROXIDES
NAPHTHALENE
NITRIC ACID
ORES
ORGANIC NITROGEN COMPOUNDS
ORGANIC SULFUR COMPOUNDS
OXIDES
PERCHLORIC ACID
PEROXIDES
PHENYL RADICALS
PHOTOMETRY
PRECIPITATION
QUALITATIVE ANALYSIS
QUANTITATIVE ANALYSIS
RESIDUES
SODIUM CARBONATES
SODIUM HYDROXIDES
SODIUM OXIDES
SOLUTIONS
SPECTROSCOPY
THORIUM
TITRATION
WATER
XYLENOL ORANGE