Arif, Z., Munandar, R., Rohaeti, E. and Rafi, M. 2023. Detection of Hexavalent Chromium Ion in Water by Optode Membrane. Indonesian Journal of Chemical Studies. 2, 2 (Dec. 2023), 76–82. DOI:https://doi.org/10.55749/ijcs.v2i2.39.