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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 May 7, 2026. https://jistechunipa.com/index.php/istech/article/view/141