GREEN ULTRASOUND-ASSISTED EMULSIFICATION DISPERSIVE LIQUIDLIQUID MICROEXTRACTION COMBINED WITH SPECTROPHOTOMETRY FOR PRECONCENTRATION AND QUANTIFICATION OF NICKEL IN ENVIRONMENTAL SAMPLES. - Alenezi, Samya Sh.; Gouda, Ayman A.; El Sheik, Ragaa; Moustafa, Ahmed H.; Ibraheem, Fatma A.; Elgafary, Mohamed; Al-Enani, Lamis Eh.; Almasry, Mahmoud A.; Khedr, Abdalla M. (Bulletin of the Chemical Society of Ethiopia, 2025)