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Pengaruh Variasi Massa dan Waktu Kontak Biochar Lumpur IPAL Teraktivasi NaOH terhadap Adsorpsi Cr(VI). jse [Internet]. 2026 Aug. 23 [cited 2026 Sep. 14];11(3). Available from: https://jse.serambimekkah.id/index.php/jse/article/view/2110