Reagents used in drinking water supply practice: safety problems
The paper discusses the problems of chemical safety associated with the use of coagulants and flocculants in the practice of drinking water supply. Modern reagents are often technological mixtures. Modifying additives that make up the reagents, can lead to increased toxic effect with a combined action. Monomers and impurities that are part of synthetic polyelectrolytes pose a significant risk to public health. Upon receipt of the composite reagents may be high-temperature, catalytic degradation of the polymer.Objective: to study solutions ofpolyDADMAC, a mixture of solutions of polyDADMAC and aluminum oxychloride when they aremixed at a temperature of 20 ° C and 85 ° C for 30 minutes to obtain a modified coagulantThe MALDI-ToF MS method was used.It was established that the starting compounds polyDADMAC and aluminum oxychloride are not inert with respect to each other and enter into chemical interaction, as a result of which a wide range of different chemical compounds with a wide range of molecular weights is formed. After heat treatment for 30 minutes at 85 ° C, spectra are found that characterize the molecular mass of ions 647.21, 665.20, 666.20, 843.20, 1021.24. There is a sharp increase in the content of the complex with the molecular weight of the ion 665.20. Determining the nature and composition of the mixture of reaction products is an urgent task and requires a detailed study using more complex methods of analysis.