Kandungan nitrogen saat pasang dan surut di Sungai Mahakam Kota Samarinda: Nitrogen content during high and low tides in the Mahakam River, Samarinda City. jipt [Internet]. 2023 Mar. 8 [cited 2025 Sep. 6];2(1):24-9. Available from: https://e-journals2.unmul.ac.id/index.php/jipt/article/view/179