Pengaruh Penambahan NaOH dan Ca(OH)2 Terhadap Penurunan Kadar Logam Berat (Fe) di Kolong Tambang 23 Desa Kimhin Kecamatan Sungailiat: The effect of the addition NaOH and Ca(OH)2 at reduced levels of heavy metal (Fe) in Tambang 23 Kimhin Village of Sungailiat Subdistrict. mineral [Internet]. 2020 Jan. 29 [cited 2026 Apr. 19];2(2):56-61. Available from: https://www.journal.ubb.ac.id/index.php/mineral/article/view/1552