Thiengmanee, Usana, Nattikarn Kaewkhomdee, Sutthinun Taebunpakut, and Charun Yafa. “Development of Thailand Reference Material for determining trace elements in drinking water”. Bulletin of Applied Sciences 6, no. 6 (October 7, 2022): 88–96. accessed April 22, 2026. https://ph03.tci-thaijo.org/index.php/BAS/article/view/212.