Determination of Zinc Level of Catfish (Clarias Batrachus) From Sei Sikambing Market by Visible Light Spectrophotometry. Jurnal Indah Sains dan Klinis, [S. l.], v. 2, n. 2, p. 22–28, 2021. DOI: 10.52622/jisk.v2i2.22. Disponível em: https://ejournal.sumateraconnect.or.id/index.php/jisk/article/view/16.. Acesso em: 21 nov. 2024.