Ayah O. Abouligheeb, et al. “Development and Analytical Evaluation of an L-Arginine-Based Optical Sensor for Spectrophotometric Detection of Cu(II) Ions in Water Samples”. Journal of Insights in Basic and Applied Sciences, vol. 2, no. 3, Sept. 2026, pp. 799-06, https://doi.org/10.65421/jibas.v2i3.207.