Determination of Major Cation and Anion Content in Coconut Fiber Ash Potentially Renewable Catalyst: Penentuan Kandungan Kation dan Anion Mayor dalam Abu Serabut Kelapa Berpotensi Katalis Renewable. JISTECH. 2023;6(2). Accessed June 21, 2026. https://jistechunipa.com/index.php/istech/article/view/141