Fluorescein sodium,Uranine 518-47-8

In the case of concentrated sulfuric acid, it appears yellow with weak fluorescence, which is diluted into yellow precipitation, and its aqueous solution plus sodium hydroxide is a dark solution with dark green fluorescence. Orange red powder; Odorless, almost tasteless; It is hygroscopic.

The product is soluble in water and slightly soluble in ethanol.

Orange-red powder, odorless, hygroscopic; Soluble in water, the solution is yellow-red, with strong yellow-green fluorescence, disappear after acidification, and appear again after neutralization or alkalization, slightly soluble in ethanol; The maximum absorption wavelength (water) is 493.5nm.

1. Traits: undetermined

2. Density (g/ cm3,25/4℃) : 1.601

3. Relative steam density (g/cm3, air =1) : undetermined

Melting point (° C) : 320

Boiling point (° C, normal pressure) : not yet determined

6. Boiling point (8kPa) : not yet determined

7. Refractive index: not determined

1. Adsorption indicator. REDOX indicator. Fluorescence spectrophotometric analysis of sulfur ions. Titrate chlorine, bromine, and iodine. Luciferin is the substrate for luminescent substances. A substance that makes many living things fluorescent. It forms a complex with ATP (adenosine fluorescein) and then binds with luciferase (1uciferase). Luciferin, which is activated during oxidation, emits light. The whole reaction is used for the detection of living organisms or for quantitative analysis of very low levels of bacterial contamination. For example, with a fluorescence photometer.

2. Used as a fluorescence adsorption indicator for the determination of Cl-, Br-, I- and SCN- silver salts by precipitation titration. It is also used as an acid-base titration fluorescence indicator with a PH value of 4.0 (teal) ~6.6 (green).

3. Indicators for chemical analysis, biological dyes and cosmetic colorants.