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A fluorimetric study of the thorium-morin system

Journal of the American Chemical Society

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Abstract

Thorium reacts with morin to yield a yellow complex that fluoresces when irradiated with ultraviolet light. The effect on the fluorescence 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+4, Al+3, Fe+3, Ca+2 and La+3 are discussed. The fundamental relationships between light absorption and fluorescence are expressed in a general equation that applies to a three-component system when the fluorescence is measured in a transmission-type fluorimeter. This general equation is used to obtain an expression for the fluorescence of the thoriummorin 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 whichrelates 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.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
A fluorimetric study of the thorium-morin system
Series title:
Journal of the American Chemical Society
Volume
79
Issue:
20
Year Published:
1957
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
5425
Last page:
5435
Number of Pages:
11