EVALUATION OF THE PRESENCE OF NITRATE AND ITS REMOVAL IN WATERS FROM GROUNDWATER SOURCES IN MARINGÁ-PR. Rev Cient Fac Educ e Meio Ambient [Internet]. 27 de mayo de 2020 [citado 25 de agosto de 2026];10(2):84-9. Disponible en: https://revista.faema.edu.br/index.php/Revista-FAEMA/article/view/843