Abstract
Samples of fresh and waste non-hydrocarbon lubricating-cooling liquid ( NLCL ) (manufactured by Ingersoll Rand) from the compressed air compressor based on the esters of high atomic alcohols of polyalkylene glycols were the objects of the study. A spectrofluorimetric method for the determination of an antioxidant additive (alkylated diphenylamine) in the NLCL was proposed. TLC identification of alkylated diphenylamine and the optimization of the conditions of NLCL chromatographic analysis as well as the assessment of the metrological characteristics of the developed methodology were conducted. The optimal conditions for the spectrofluorimetric detection of alkylated diphenylamine were selected and included the wavelength of excitation, emission, the choice of solvent, and the determined range of analyte concentrations (from 15 to 250 μg / l). The limits of the detection and determination of alkylated diphenylamine in NLCL were calculated. They amounted to 0.02 and 0.05 mg / l respectively. The influence of the components of the base oil on the analytical signal of diphenylamine was evaluated. The method for determining alkylated diphenylamine in NLCL was tested on a real sample. The fact of the degradation of antioxidant additives during the operation of the lubricating fluid has been established. It manifested itself in a decrease of the additive concentration. The selected methodology was express and simple in execution. It allowed studying the dynamics of the degradation of antioxidant additives and could be considered as an indirect indicator of the continued suitability of using the NLCL. Keywords: alkylated diphenylamine,, spectrofluorimetric method, chromatography, antioxidant additive, non-hydrocarbon lubricating-cooling liquid (Russian) DOI: http://dx.doi.org/10.15826/analitika.2019.23.4.005 Yu.A. Ivanova, Z.A. Temerdashev, I.A. Kolychev Federal State Budgetary Educational Institution of Higher Education «Kuban State University» (KubSU), ul. Stavropolskaia, 149, Krasnodar, 350040, Russian Federation
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