Investigation of heavy metals on water quality and sediment: A case study Bireuen, Aceh Utara and Lhokseumawe City. Valensi [Internet]. 2021 Feb. 3 [cited 2026 Oct. 16];6(2):177-84. Available from: https://journal.uinjkt.ac.id/index.php/valensi/article/view/15745