SPECIFIC FLUORESCENCE DETECTION OF LITHIUM ION USING QUINIZARIN AND EXTRACTION IN TBP

A simple and specific spot-test for lithium based on a fluorescent rea ction between Li+ ion and Quinizarin in alkaline medium is described. The resulting compound is extracted in TBP, and fluorescence is observ ed in the organic phase under illumination with a UV lamp at 360 nm. T he sensitivity of the test is 0.1 mu g.cm(-3). Applications of the tes t for lithium include the corresponding cation groups using the H2S an d Na2CO3 systematic schemes of analysis; and directly in synthetic mix tures of inorganic ions, mineral water, drugs, dietetic products and b lood serum.