Validación de método para determinación de la demanda química de oxígeno en muestras de aguas en Abges Laboratorio Analítico Ambiental Cía. Ltda.

Abstract

This project presents the validation of HACH method 8000, digestion and colorimetry method, for ABGES Laboratorio Analítico Ambiental Cia. Ltda. At present, the laboratory has not validated any parameter for water quality and to ensure the reliability of the results, these parameters are outsourced, which generates a financial loss for the company. For the construction of this project, information was collected on the equipment needed, volumetric material and standard solution from potassium phthalate acid, and equipment that is necessary to eliminate interferences that may exist. Additionally, the optimal condition of the device was checked to identify possible problems. After reviewing the information obtained, the water matrix was determined, based on the consideration that in COD analysis the greatest interference is chlorides, and the laboratory does not have equipment to quantify them. In this context, the only type of water that will not have the presence of chlorides will be drinking water, in this context, the method has been validated, based on validation parameters, ANOVA and uncertainty, to decide if it can be applied within the laboratory. To conclude, the results obtained are not completely reliable, since at collecting information, it was possible to determine that the equipment was not calibrated and therefore the data could present errors.