Kristyaka, Hayu Sanjaya Radix. “Optimization of the Conditions for the Process of Precipitating the Hydroxide of Metals - Heavy Metals Chromium And Nickel Is Gradually In Electroplating Liquid Waste”. Jurnal Ilmiah Kanderang Tingang 9, no. 2 (December 31, 2018): 150-165. Accessed July 20, 2024. https://chem-upr.education/ojs/index.php/JIKT/article/view/14.