Determination of Different Nanoparticles Contamination in Drinking Water and non Alcoholic Beverages

The presence of microscopic particles of plastic in food is an urgent problem of the modern food industry and one of the main issues of food safety. This is due to the fact that microscopic plastic particles have so far been found in almost all environmental objects, but their effect on the body has not been fully studied. However, there are no clear methods for the determination of such particles, nor methods for cleaning food products from them. In the present work, the presence of nanoparticles of different chemical composition in drinking water and some drinks was determined by the method of Dynamic Laser Light Scattering (DLS). The size of the found micro and nano objects, their distribution by fractions was measured. For this purpose, the “Zetatrac” Laser Nanoparticle Analyzer (USA) was used. The average molecular weight of the detected particles, their average specific surface area and zeta potential are also determined. In some samples, its value is in the region of less than 1 mV, which indicates the tendency of micro objects to coagulate, and in others – more than 10 mV, i.e. here the suspensions are quite stable. Based on the instrumental-specific characteristics, it was suggested that nano and micro particles in drinking water and nano particles in drinking drinks are chemically similar to polymers – polypropylenes and polyethylene tetaphthalate. In some samples of drinking water, nanoparticles were found that are identical in characteristics to both plastic and rust. The content of nano and micro objects in the studied liquid samples was also determined. It ranges from 0.8 to 5 • 10-3%.

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