KHAODEE, W.; WONGKITI, R.; MADANG, S. The Application of Using Natural Reagent Extracted from Purple Sweet Potato for Naked-Eye Detection of Copper in Water Samples. Asian Health, Science and Technology Reports, [S. l.], v. 26, n. 3, p. 181–188, 2018. DOI: 10.14456/nujst.2018.9. Disponível em: https://ph03.tci-thaijo.org/index.php/ahstr/article/view/1682. Acesso em: 30 aug. 2026.