STUDIES OF ANALYTICAL SEPARATIONS

Thesis/Dissertation · Mon Jan 01 04:00:00 EST 1962

OSTI ID:4711122

Donaldson, D J

Solvent extraction was extensively applied to the separation of cations but its application to anion separation was for the most part ignored. A study was undentaken to determine the conditions under which the extraction of thiocyanate was favorable. Different solutions of thiocyanate were shaken with 1: 1 tri-n-butyl phosphate (TBP) -- methyl isobutyl ketone (MIBK), and after separation of the layers the aqueous phase was colorimetrically analyzed for thiocyanate. Zinc was chosen as a coordinating metal ion to form extractable ion association species with thiocyanate. Addition of zinc in various concentrations was found to have no effect on the extraction. The distribution ratio rose with increasing nitric acid concentration until a constant value was reached at 1M. The extractability of thiocyanate was found to increase with decreasing temperature and with increasing thiocyanate concentration. Recovery and subsequent determination of thiocyanate was achieved by shaking the organic phase with potassium hydroxide after it was treated with carbon tetrachloride. Coextraction and selectivity of the system were studied with regard to eighteen anions. Molecular thiocyanic acid was responsible for the extraction. The extracting species was TBP.HNCS. Improvements on the qualitative analysis scheme devised by West and Vick were made. Calcium, strontium, and bismuth were found to be troublesome in the analysis scheme of West and Vick. (TCO)

• Research Organization: Originating Research Org. not identified
• NSA Number: NSA-17-025373
• OSTI ID: 4711122
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ANIONS
BARIUM
BUTYL PHOSPHATES
BUTYL RADICALS
CALCIUM
CARBON TETRACHLORIDE
CATIONS
CHEMISTRY
COLOR
CYANIDES
DISTRIBUTION
ERRORS
IMPURITIES
KETONES
METHYL RADICALS
NITRIC ACID
ORGANIC SULFUR COMPOUNDS
POTASSIUM HYDROXIDES
QUALITATIVE ANALYSIS
SEPARATION PROCESSES
SOLVENT EXTRACTION
STRONTIUM
ZINC COMPLEXES