An Eco-Friendly Ultrasound-Assisted Emulsification Dispersive Liquid–Liquid Microextraction of Nickel in Environmental Samples Coupled with Spectrophotometry

A new, simple, rapid, sensitive and environmentally friendly ultrasound-assisted emulsification dispersive liquid–liquid microextraction (UAE-DLLME) has been developed for trace nickel Ni(II) separation preconcentration in environmental samples prior to spectrophotometric determination. The proposed method based on using non-ionic water-soluble surfactant Triton X-114 (TX-114) as a disperser solvent tetrachloroethylene an extractive solvent. 6-(1,3-thiazolylazo)-2-nitrophenol (TANP) complexing agent was used complexation of at pH 7.0. influence various variables the performance UAE-DLLME optimized. Under optimal conditions, calibration graph linear rage 1.0-300 μg L-1. detection quantitation limits were determined 0.3 1.0 L-1, respectively. factor enhancement obtained 60 45. Relative standard deviation (RSD %) precision 100 200 µg L-1 1.4 2.1%, respectively (n=10). validation proved by analysis certified reference materials. Finally, applied preconcentrate determine levels real water, food tobacco with satisfactory results.