Use of IR and UV-vis spectroscopy for pesticides and agrochemicals activator analysis

The purpose of the study is to evaluate the capabilities of IR and electron spectroscopy methods for analyzing the organosilicon activator of pesticides and agrochemicals based on polyalkylene oxide siloxane and determining its residual quantities on grape bunches during the harvest season. The objects of research are Aligote and Cabernet Sauvignon grape varieties, the organosilicon adjuvant Atomic and its model mixtures with distilled water, as well as grape rinsing water. The analysis was carried out using electron spectroscopy and Fourier transform infrared spectroscopy using an attenuated total internal reflection (ATR) attachment with a diamond element. It has been shown that in the Atomic IR spectrum there is a very strong characteristic absorption band of stretching vibrations of the Si-O and C-O bonds at 1077 cm-1, which may be a marker of the presence of this adjuvant in its mixtures with water. A wide absorption band for stretching vibrations of O-H bonds was also found at 3389 cm-1. The absorption band of stretching vibrations of the Si-O and C-O bonds of the Atomic adjuvant is observed in the IR spectra of its mixtures with water up to a ratio of 1:69 (by volume). In the Atomic electronic spectrum, absorption maxima were found at 276 and 310 nm. The absorption maximum at ≈270 nm remains with further dilution, but is practically no longer visible in the spectrum of the Atomic mixture with water in a ratio of 1:500 (by volume). Under experimental conditions, IR and electron spectroscopy methods did not reveal any residual amounts of the Atomic adjuvant in the rinsing water from Aligote and Cabernet Sauvignon grape varieties pre-treated with it. The results obtained can be used in the analysis of the Atomic activator and other products based on polyalkylene oxide siloxane in various mixtures used in agriculture for treating plants.