Febrita, E. 2020. Analysis of Concentration of Heavy Metal (Pb) and Cadmium (Cd) In Waterfish (Eichhornia crassipes) in Indragiri River, Riau. International Journal of Ecophysiology. 2, 1 (May 2020), 24-33. DOI:https://doi.org/10.32734/ijoep.v2i1.3985.