2022. The Effect Of Contact Time Variations On The Efficiency Value And The Adsorption Kinetic Mechanism Of Iron (Fe) On Batik Waste Cual Using Chitosan. Jurnal Riset Fisika Indonesia. 2, 2 (Jun. 2022), 31–36. DOI:https://doi.org/10.33019/jrfi.v2i2.3221.