Putri, N. F. Y. ., and M. . Rahmayanti. “Desorption of Naphtol Blue-Black from Humic Acid Modified Magnetite Using NaOH As Desorption Agent”. Proceeding International Conference on Science and Engineering, vol. 3, Apr. 2020, pp. 157-8, doi:10.14421/icse.v3.488.