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]. 2020 May 27 [cited 2026 Aug. 24];10(2):84-9. Available from: https://revista.faema.edu.br/index.php/Revista-FAEMA/article/view/843