Aluminum complexation by catechol as determined by ultraviolet spectrophotometry
Methods of ultraviolet (UV) spectrophotometry were used to determine the stoichiometry and association constant for the Al-catechol complex from pH 3.8 to 4.6. Job's method of continuous variation indicated the Al-catechol complex had a 1:1 stoichiometry in the pH range studied. Aluminum titrations of catechol and pH titrations of catechol plus Al resulted in a shift in the UV spectra due to the formation of an Al-catechol complex absorbing UV radiation uniquely different than that of free catechol. General equations were developed for the determination of association constants assuming an organic and Al-organic complex absorb UV radiation. Aluminum titrations with constant catechol concentration yielded a log k/sub 0.1//sup c/ of 16.22 for a 1:1 Al-catechol complex. Calculated absorbance as a function of pH agree dwell with experimental pH titrations of solutions containing catechol plus Al. The fact that Al can be complexed by catechol at low pH indicates the o-hydroxy group provides a potential source for Al complexation in soil and surface waters.
- Research Organization:
- Cornell Univ., Ithaca, NY (USA)
- OSTI ID:
- 6103173
- Journal Information:
- Environ. Sci. Technol.; (United States), Vol. 23:3
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ALUMINIUM COMPLEXES
STOICHIOMETRY
CHEMICAL COMPOSITION
EQUATIONS
PYROCATECHOL
SOILS
SPECTROPHOTOMETRY
SURFACE WATERS
ULTRAVIOLET RADIATION
AROMATICS
COMPLEXES
DEVELOPERS
ELECTROMAGNETIC RADIATION
HYDROXY COMPOUNDS
ORGANIC COMPOUNDS
PHENOLS
POLYPHENOLS
RADIATIONS
510200* - Environment
Terrestrial- Chemicals Monitoring & Transport- (-1989)
520200 - Environment
Aquatic- Chemicals Monitoring & Transport- (-1989)