X-ray fluorescence equipment and method, nutrient content analysis in solid NPK compound fertilizer. Vietnam Journal of Catalysis and Adsorption, [S. l.], v. 10, n. 1S, p. 180–186, 2022. DOI: 10.51316/jca.2021.118. Disponível em: https://jca.edu.vn/index.php/jca/article/view/2021.118.. Acesso em: 28 jul. 2026.