Mixed Ligand Complex of Lanthanum(III) and Alizarine-Complexone with Fluoride in Micellar Medium for Spectrophotometric Determination of Total Fluorine

Alexander Chebotarev1, Anhelina Demchuk1, Kateryna Bevziuk1, Denys Snigur1
1 Odesa I.I. Mechnikov National University, 2, Dvoryanskaya St., 65082 Odesa, Ukraine 270892denis@gmail.com
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A technique for direct spectrophotometric determination of total fluorine in products for oral hygiene using a mixed ligand complex La(III) and alizarin-complexone with fluoride ion in the presence of a non-ionic surfactant has been developed. A number of complexes of different stoichiometry formed in the system has been found. The La:alizarin-complexone:F- = 1:2:1 complex was shown to be used as an analytical form. The complex in the presence of Tween 80 is characterized by the molar absorptivity ε620 = 11000 mol∙dm-3∙cm-1. The calibration curve is linear in the concentration range of fluoride ions 0.06–0.5 μg/ml. A simple, rapid, sensitive, and green procedure for the spectrophotometric determination of F- using lanthanum alizarin-complexonate in the presence of Tween 80 was proposed and this technique was tested on samples of toothpastes and mouth rinses.

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