Mariadi, Pra Dian, and Rosnita Sebayang. 2017. “Removal Lead (Pb) and Mercury (Hg) from Juaro Fish (Pangasius Polyuranodon) Using Citric Acid from Pineapple Extract (Ananas Comosus) As Chelating Agent”. Science and Technology Indonesia 2 (4):89-91. https://doi.org/10.26554/sti.2017.2.4.89-91.