Cadmium (Cd) concentration in the carp (Cyprinus carpio) organs at Lau Kawar Lake, Karo Regency, North SumatraKhatrin Melda Malau, Syafruddin Ilyas and Ternala Alexander BarusE3S Web Conf., 322 (2021) 01020DOI: https://doi.org/10.1051/e3sconf/202132201020