DETERMINING TARTRATE IONS IN THE SAMPLES OF MINERAL TABLE WATERS BY THE DECAY OF MOLECULAR LUMINESCENCE OF RUTIN IN COMPLEX WITH YTTRIUM (III)

Анотація

The yttrium (III)-rutin (Rut) complex in the presence of bovine serum albumin (BSA) is suggested as a luminescent sensor to determine tartrate ions (Tart). It has been experimentally established that tartrate ions reduce the luminescence intensity (I_lum) of the Y(III)-Rut complex in the presence of BSA and Tart. The spectral and luminescent properties of the Y(III)-Rut complex in the presence of BSA have been studied. The peak of the luminescence spectrum of the Y(III)-Rut complex in the presence of BSA is at λ=570 nm. In the presence of potassium tartrate, I_lum of the Y(III)-Rut complex decreases, and the maximum luminescence shifts to the longwave region of the spectrum (λ=590 nm). It is known that the luminescence decay can be caused by various processes, including reactions in the excited state, energy transfer, formation of complexes, and collisional decay. It can be assumed that the decay effect of the Y(III)-Rut complex is due to the complexation reaction of Y(III) with Tart, that leads to the destruction of the Y(III)-Rut complex. The luminescence decay of the Y(III)-Rut complex in the presence of BSA by means of Tart follows the Stern-Volmer relationship. The Stern-Volmer constant K is 1230 l/mol. The method of luminescent determination of tartrate ions in mineral table waters has been developed. It is based on using the decay of rutin’s molecular luminescence in the Y(III)-rutin complex in the presence of BSA. The linear calibration plot for tartrate ions has been obtained over the range of Tart concentrations of 0.02 to 0.20 mg/ml. The limit of determining potassium tartrate is 0.01 mg/ml. The technique has an advantage over the existing ones due to the absence of toxic reagents, and short-time analysis. Besides, it allows rapid screening of samples of mineral table water.