Determination of citrat ?ions in sweet soft drinks on molecular luminescence of routine in complex with yttrium (iii)

As a luminescent sensor for citrate-ions definition it is suggested to use a complex yttrium (III) - routin - citrate-ion with a ratio of components 1:1:1. Optimum conditions of mixed-ligand complex formation are determined, his spectral and luminescent characteristics (wavelength maximum of luminescence and excitement) are defined. Optimum conditions of a complex formation are chosen: optimum concentration of solutions - yttrium chloride (III), routin, trisodium citrate. The method of luminescent determination of citrate - ions in sweet soft drinks, based on the use of a rutin's molecular luminescence in the mixed-ligand complex Y(III) - Rut - Cit is developed. The detection limit of citrate-ion in sweet soft drinks is 2,7 10-3 mg/ml. A method advantageously differs from existing by absence of toxic reagents, expensive equipment, by short duration of analysis, allows to carry out rapid skrining of different sweet soft drinks.