Ali, N. H. ., Osman, M. S., Mohamad Robi, F. I. ., Maidan Dali, M. R. . and Abd Rahman, M. F. . (2023) “Colorimetric-Based Concentration Measurement of Manganese Ions using Spectroscopy Approach”, Scientific Research Journal, 20(1), pp. 89–105. doi: 10.24191/srj.v20i1.21132.