THE EXTRACTION OF COLORED COMPLEXES FORMED BY REAGENTS OF THE ARSENAZO- THORON GROUP

Journal Article · Fri Sep 01 00:00:00 EDT 1961 · Doklady Akad. Nauk S.S.S.R.

OSTI ID:4819630

Kuznetsov, V I; Savvin, S B

Organic reagents such as arsenazo-I, -I(, and -III, and thoron are useful for the photometric determination of U, Pu, Th, rare earths and other elements. These reagents contain sulfo groups which make them readily soluble in water, and difficult to extract with organic solvents. The negative charge on the sulfo groups can be compensated by addition of salts of heavy, hydrophobic organic cations such as organic amine salts (diphenylguanidine), tetraphenylarsonium salts, or oxonium salts formed by trubutylphosphate, BETA - napthol and cyclohexane. The proper anion must be used to compensate the plus charge of the cation. Chloride, sulfate or nutrate are sometimes used, but more hydrophobic anions such as rhodanide, perchlorate, chloracetate or trichloracetate may be required. Butyl or amyl alcohol are generally used as solvents because of their ability in replacing water of solvation. A number of practical examples are given. Thus, hexavalent uranium is extracted from weak HCl by addition of arsenazo followed by urotropine and diphenylguanidine chloride. Butyl or amyl alcohol is used to extract the rose complex. Thorium is extracted from 0.05N HCl with thoron by successive additions of monochloracetic acid, diphenylguanidine chloride, and butyl or amyl alcohol as an extractant. Extraction can be performed from HCl or H/sub 2/SO/sub 4/solutions with the use of arsenazo-III reagent. The arsenazo or thoron reagent can be used to precipitate Th or U from very dilute solutions (1 to 1 x 10/sup 9) by addition of methyl violet or some other basic dye. The organtc precipitate is dissolved in butyl alcohol, and the Th or U is determined photometrically. (TTT)

• Research Organization: Vernadskii inst. of Geochemistry and Analytical Chemistry, Moscow
• NSA Number: NSA-16-001709
• OSTI ID: 4819630
• Journal Information: Doklady Akad. Nauk S.S.S.R., Vol. Vol: 140; Other Information: Orig. Receipt Date: 31-DEC-62
• Country of Publication: Country unknown/Code not available
• Language: Russian

Related Subjects

CHEMISTRY
ACETATES
ACETIC ACID
ACIDITY
ALCOHOLS
ALKYL RADICALS
AMINES
ANIONS
ARSENAZO
ARSENIC
BUTYL PHOSPHATES
BUTYL RADICALS
CATIONS
CHEMICALS
CHLORIDES
COLOR
COMPLEXES
CONFIGURATION
CYCLOALKANES
ELEMENTS
FRICTION
HEAT TRANSFER
HEXANE
HYDROCHLORIC ACID
METHYL RADICALS
MOLECULES
NAPHTHALENE
NAPHTHOL
NITRATES
ORGANIC ACIDS
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXONIUM RADICALS
OXYGEN
PENTANE
PERCHLORIC ACID
PHENOLS
PHENYL RADICALS
PHOTOMETRY
PLUTONIUM
PRECIPITATION
QUANTITATIVE ANALYSIS
RADON 220
RARE EARTHS
REACTORS
REAGENTS
RHODIUM COMPOUNDS
SALTS
SEPARATION PROCESSES
S