KHAODEE, Warangkhana; WONGKITI, Ratikon; MADANG, Suphatta. The Application of Using Natural Reagent Extracted from Purple Sweet Potato for Naked-Eye Detection of Copper in Water Samples. Naresuan University Journal: Science and Technology (NUJST), [S.l.], v. 26, n. 3, p. 181-188, sep. 2018. ISSN 2539-553X. Available at: <http://www.journal.nu.ac.th/NUJST/article/view/Vol-26-No-3-2018-181-188>. Date accessed: 14 nov. 2019. doi: https://doi.org/10.14456/nujst.2018.9.