Sustainable ionic liquid-assisted cloud point extraction for enrichment of trace copper(II) in water and food samples prior to spectrophotometric determination. - El-Bialy, Nagwa M. A.; Gouda, Ayman A.; Ghaith, El-Sayed I. A.; Khedr, Islam E.; Moustafa, Ahmed H.; Mohamed, Abd-ElNasser A.; Ismaiel, Ahmed M. (Scientific Reports, 2026)