Liquid-liquid extraction, photometric and atomic absorption spectrophotometric determination of mercury
A selective and sensitive spectrophotometric and atomic absorption spectrophotometric method is developed for the determination of traces of mercury with N-phenylcinnamohydroxamic acid (PCHA) in the environment. Mercury is extracted into a chloroform solution of PCHA at pH 8.5-10.0 and determined by AAS. The mercury hydroxamate binary complex is yellow in color having a maximum absorbance at 390 nm and molar absorptivity 4.3 x 10/sup 3/ l mol/sup -1/ cm/sup -1/, sandell sensitivity 0.0466 ..mu..g/cm/sup 2/. The ternary system using 1-(2-pyridylazo) 2-naphthol has molar absorptivity 8.82 x 10/sup 3/ l mol/sup -1/ cm/sup -1/ at 550 nm, sandell sensitivity 0.0228 ..mu..g/cm/sup 2/. Beer's law is obeyed in the concentration range of 2.37-38.0 ppm and 0.80-19.5 ppm of mercury for binary and ternary system, respectively. The extraction of Hg-PCHA binary system is studied with a liquid cation exchanger, bis-(2-ethyl hexyl) phosphoric acid (HDEHP) and found to have better selectivity than Hg-PCHA-PAN system. The molar absorptivity of the Hg-PCHA-HDEHP system is 8.82 x 10/sup 3/ l mol/sup -1/ cm/sup -1/ at 390 nm and Beer's law is obeyed in the concentration range of 0.47-20 ppm of mercury. The present method is applied to the determination of mercury in eye drops, aurvedic drugs and environmental samples. 24 references, 3 tables.
- Research Organization:
- Univ. of Baroda, India
- OSTI ID:
- 5982865
- Journal Information:
- Anal. Lett.; (United States), Journal Name: Anal. Lett.; (United States) Vol. 18:B20; ISSN ANALB
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400104* -- Spectral Procedures-- (-1987)
400105 -- Separation Procedures
ABSORPTION SPECTROSCOPY
AMINES
CHEMICAL ANALYSIS
CHLORINATED ALIPHATIC HYDROCARBONS
CHLOROFORM
COMPLEXES
DATA
DRUGS
ELEMENTS
ENVIRONMENTAL MATERIALS
EXPERIMENTAL DATA
EXTRACTION
HALOGENATED ALIPHATIC HYDROCARBONS
HYDROXAMIC ACIDS
HYDROXY COMPOUNDS
INFORMATION
MATERIALS
MERCURY
MERCURY COMPLEXES
METALS
NUMERICAL DATA
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
PH VALUE
QUANTITATIVE CHEMICAL ANALYSIS
SENSITIVITY
SEPARATION PROCESSES
SOLVENT EXTRACTION
SOLVENT PROPERTIES
SPECTROPHOTOMETRY
SPECTROSCOPY
TRACE AMOUNTS