Ecological risk assessment of Polychlorinated Biphenyls (PCB) in the sediment around Langkawi Island, Malaysia. RJBAS [Internet]. 2025 Dec. 31 [cited 2026 Oct. 2];4(2):14-9. Available from: https://ojs.abhath-ye.com/index.php/OJSRJBAS/article/view/892