Aseguramiento metrológico de técnicas microvolumétricas en un laboratorio de docencia aplicando principios de química analítica verde

Abstract

This research evaluated the metrological quality of three microvolumetric tests such as alkalinity, hardness and residual chlorine in aqueous matrices. In addition, the reduction of pollutant residues was estimated as a result of the application of these tests. It began with the construction of the micro-scale titration equipment and its respective set-up. The selected reagents were the same as those in the classical techniques, grade ACS, but of lower concentration. In the three microvolumetric tests, as part of the metrological study, studies were developed: validation, proficiency tests and measurement uncertainty measurement. In the aptitude tests, groups of students participated to obtain the z-score. In the calculation of measurement uncertainty factors such as: principle of the method and contributions of type A and B. Finally, the savings of economic resources in the purchase of chemical reagents in the Laboratories of Teaching, and the notable reduction, both in the generation of hazardous waste and in the environmental impact of the discharge of liquid effluents to the sewage system, would be remarkable.