Jannah, F., Idroes, R., Nazaruddin, N., Idris, N., Safitri, E., & Md Sani, N. D. (2023). Assessment of Al3+ Ion Selectivity Coefficient (Kij) in Polyurethane Membranes Derived from Castor Oil (Ricinus communis. L) via Separated Solution Method. Grimsa Journal of Science Engineering and Technology, 1(2), 78–85. https://doi.org/10.61975/gjset.v1i2.18