Determinação de cloraminas em água para consumo humano

Abstract

The quality of water supply for human consumption in big cities is extremely important for the maintenance of public health. Therefore, some analytical and physical chemical parameters are stipulated by Consolidation Ordinance Nº5, of September 28, 2017, in order to guarantee the quality of the water made available to the population. Because of this, this study aimed to implement the analytical DPD Colorimetric method 4500-Cl G, described in the Standard Methods for the examination of water and wastewaters. Aiming at the quantification of chloramines as combined chlorine in water samples for human consumption. A calibration curve was prepared within the limits stipulated by the method used, resulting in a determination coefficient (R2) of 0.999. In the tests carried out through the developed curve, it was verified that all the analyzed water samples presented contents below the maximum allowed value (VMP) of chloramines as combined chlorine, in agreement with PRC Nº5. However, 90% of them do not meet the minimum limit of free chlorine that guarantees the quality of water disinfection for human consumption. Therefore, it was possible to notice a deficiency in the chlorination of water in the analyzed samples. Thus, it is concluded that it was possible to implement analysis of quantification of chloramines in the laboratory, using the colorimetric DPD analytical method. Since the concentrations of chloramines, such as combined chlorine, in the analyzed samples are in accordance with the current ordinance.