Water Quality Status of the Sanga-Sanga River, East Kalimantan, determined with the Pollution Index Method under high- and low-tide conditions. jipt [Internet]. 2026 Aug. 17 [cited 2026 Oct. 17];5(2):171-6. Available from: https://e-journals2.unmul.ac.id/index.php/jipt/article/view/3187