A FLUORIMETRIC STUDY OF THE THORIUM-MORIN SYSTEM
Journal Article
·
· Journal of the American Chemical Society (U.S.)
Thorium reacts with morin to yield a yellow complex that fluoresces when irradiated with ultraviolet light. The effect on the fluorescenee of such variables as concentration of acid, alcohol, thorium, morin, and complex; time, temperature and wave length of exciting light are studied to determine experimental conditions yielding maximum fluorescence. The effects of Zr/sup +4/ , Al/sup +3/, Fe/sup +3/, Ca/sup +2/, and La/sup +3/ are discussed. The fundamental relationships be tween light absorption and fluorescence are expressed in a general equation that applies to a three-component system when the fluorescence is measured in a transmissiontype fluorimeter. This general equation is used to obtain an expression for the fluorescence of the thorium-- morin system. Equations, derived from experimental data, relate both the fraction of thorium reacted to form complex and the fraction of unquenched fluorescence to the concentration of uncombined morin. These functions, when combined with the general equation, give an expression which relates the total net fluorescence to the amount of uncombined morin in the solution. This last equation can be used to determine the one region for the concentration of uncombined morin that gives maximum sensitivity for the system. Calculated standard curves are in good agreement with experimental curves. (auth)
- Research Organization:
- U.S. Geological Survey, Washington
- NSA Number:
- NSA-12-000075
- OSTI ID:
- 4336074
- Journal Information:
- Journal of the American Chemical Society (U.S.), Journal Name: Journal of the American Chemical Society (U.S.) Journal Issue: 20 Vol. Vol: 79; ISSN JACSA
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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