engleski

Photolysis of N-nitrosodipropylamine, mebendazole and clothianidin in drinking water

Industrialization, urbanization, intensive population growth and accelerated lifestyle consequently lead to an increase in the consumption of pharmaceuticals, pesticides and other xenobiotics. Xenobiotic substances and their degradation products after application end up in surface waters, but also in groundwater, soil, and even in drinking water. However, their interactions in the ecosystem are not fully known, nor are the transformations, persistence or degradability of pharmaceuticals and metabolites and should be investigated.[1, 2] Therefore, the photolytic process of elimination of pesticides (clothianidin), antiparasitics (mebendazole) and N-nitrosodipropylamine (NDPA) in the aquatic environment was studied in this paper with the aim of examining the fate and impact on the environment and ecosystem. The effect of one component solutions, binary solutions and ternary solution of clothianidin, mebendazole and NDPA on Vibrio fischeri as a rapid indicator of toxicity was examined (ISO 11348-3: 2007). Photolytic degradation by artificial sunlight over 5 hours showed that all three components were photosensitive. Clotianidin achieved 98.54 % ± 0.31 % removal after 5 hours, 100 % removal of NDPA was achieved after only 20 min, while removal of mebendazole was 49.69 % ± 7.42 %. Photodegradation of mebendazole resulted in the formation of a new transformation or degradation compound. Toxicity was studied with Vibrio fischeri before and after photolysis. It was shown that the inhibition of the ternary solution is greater than the inhibition of single and binary solutions and that there is a significant increase in the same after 5 hours of photolysis. The formation of a new compound during photolytic degradation indicated the need for further experiments to identify the newly formed compound.

photolysis ; N-nitrosodipropylamine ; mebendazole ; clothianidin ; Vibrio fischeri

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