Warangkhana Khaodee และ Ratikon Wongkiti; Suphatta Madang. (2018) The Application of Using Natural Reagent Extracted from Purple Sweet Potato for Naked-Eye Detection of Copper in Water Samples. <i>Naresuan University Journal: Science and Technology</i>, <i>26</i>(3), 181-188.Warangkhana Khaodee และ Ratikon Wongkiti; Suphatta Madang. "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 26 (2018):181-188.Warangkhana Khaodee และ Ratikon Wongkiti; Suphatta Madang. The Application of Using Natural Reagent Extracted from Purple Sweet Potato for Naked-Eye Detection of Copper in Water Samples. Naresuan University Graduate School:ม.ป.ท. 2018.