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