Environmental analysis of thorium (IV) by extractive separation with N-p-methoxyphenyl-2-furylacrylohydroxamic acid and spectrophotometric determination with 4-(2-pyridylazo) resorcinol
Thorium (IV) was separated from several anions and cations commonly associated with it in environmental samples by liquid-liquid extraction with N-p-methoxyphenyl 1-2-furyl-acrylohydroxamic acid (MFHA) into chloroform at pH 3.6 - 5.5. The metal was then back-extracted into aqueous media containing 1.8 - 2.2 M HCl and determined spectrophotometrically at 500 nm (epsilon = 3.9 x 10/sup 4/ 1 mol/sup -1/ cm/sup -1/) with 4-(2-pyridylazo) resorcinol (PAR). The method was successfully applied to the analysis of thorium in coal fly ash, monazite, uranium-thorium ore, animal tissue, plant tissue, and natural waters. MFHA and PAR were chosen from thirteen hydroxamic acids and nine pyridylazo reagents, as the reagent combination that provided the maximum selectivity and sensitivity.
- Research Organization:
- Pondicherry (Central) Univ. (India)
- OSTI ID:
- 6870643
- Journal Information:
- Anal. Lett.; (United States), Journal Name: Anal. Lett.; (United States) Vol. 21:9; ISSN ANALB
- Country of Publication:
- United States
- Language:
- English
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59 BASIC BIOLOGICAL SCIENCES
ACTINIDE COMPOUNDS
ACTINIDES
AEROSOL WASTES
AMINES
ANIMAL TISSUES
ASHES
BODY
CHEMICAL ANALYSIS
DATA
ELEMENTS
EXPERIMENTAL DATA
EXTRACTION
FLY ASH
FRESH WATER
HYDROCHLORIC ACID
HYDROGEN COMPOUNDS
HYDROXAMIC ACIDS
HYDROXY COMPOUNDS
INFORMATION
INORGANIC ACIDS
MATERIALS
METALS
MINERALS
MONAZITES
NUMERICAL DATA
ORES
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PH VALUE
PHOSPHATES
PHOSPHORUS COMPOUNDS
PLANT TISSUES
QUANTITATIVE CHEMICAL ANALYSIS
RADIOACTIVE MATERIALS
RADIOACTIVE MINERALS
RARE EARTH COMPOUNDS
RESIDUES
SEPARATION PROCESSES
SOLVENT EXTRACTION
SOLVENT PROPERTIES
SPECTROPHOTOMETRY
THORIUM
THORIUM COMPOUNDS
THORIUM MINERALS
THORIUM ORES
THORIUM PHOSPHATES
TISSUES
URANIUM ORES
WASTES
WATER