Trace analysis of vanadium in environment as its ternary complex with N-p methoxyphenyl-2-furylacrylohydroxamic acid and 3-(o-carboxyphenyl) -1-phenyltriazine-n-oxide
A method is presented for the highly sensitive, selective, and rapid determination of vanadium (V) at sub-microgram levels in rocks, animal tissues, plant tissues and natural waters. The method is based on the selective extraction of vanadium (V) from strongly acidic (3-8 M hydrochloric acid) and medium with solution of N-p-methoxyphenyl-2-furylacrylohydroxamic acid (MFHA) in chloroform. The reddish-violet extract (molar absorbance 8.6 x 10/sup 3/ 1 mole/sup -1/ cm/sup -1/ at lambda max 545 nm) is then equilibrated with 3-(o-carboxyphenyl)-1-phenyltriazine-N-oxide (CPPTNO) at pH approx. 1.5. The resulting ternary complex has enhanced color (molar absorbance 1.4 x 10/sup 4/ 1 mole/sup -1/ cm/sup -1/ at lambda max 450 nm). The ternary system obeys Beer's Law at 450 nm over the range of 0-18 ..mu.. g/ml of vanadium. The extraction system achieves 20-fold enrichment of vanadium and enables the determination of the metal down to parts per billion (ng 1/sup -1/) levels. The method tolerates the presence of a large number of anions and cations which are normally present with vanadium in rocks, plant tissues, animal tissues and natural waters. The applicability of the method was tested by the analysis of vanadium in these matrices. MFHA was selected from nine hydroxamic acids as it provided maximum sensitivity and selectivity.
- Research Organization:
- Centre for Water Resources Development and Management, Kunnamangalam, India
- OSTI ID:
- 5572741
- Journal Information:
- Anal. Lett.; (United States), Vol. 20:9
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
54 ENVIRONMENTAL SCIENCES
59 BASIC BIOLOGICAL SCIENCES
HYDROXAMIC ACIDS
SOLVENT PROPERTIES
PLANTS
QUANTITATIVE CHEMICAL ANALYSIS
ROCKS
TISSUES
VANADIUM
ABSORPTION SPECTROSCOPY
SOLVENT EXTRACTION
WATER
EXPERIMENTAL DATA
POLLUTANTS
TRACE AMOUNTS
AMINES
BODY
CHEMICAL ANALYSIS
DATA
ELEMENTS
EXTRACTION
HYDROGEN COMPOUNDS
HYDROXY COMPOUNDS
INFORMATION
METALS
NUMERICAL DATA
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
SEPARATION PROCESSES
SPECTROSCOPY
TRANSITION ELEMENTS
400105* - Separation Procedures
520200 - Environment
Aquatic- Chemicals Monitoring & Transport- (-1989)
510200 - Environment
Terrestrial- Chemicals Monitoring & Transport- (-1989)
550200 - Biochemistry
400102 - Chemical & Spectral Procedures