A new design of equilibrium hollow fiber solid-liquid phase micro-extraction (HF–SLPME) was developed for the determination of Zn(II) in environmental water samples. Membrane extraction with sorbent interface which we used in this research is a two-phase supported liquid membrane consisting of aqueous (donor phase), organic solvent/nano sorbent membrane (acceptor phase) system operated in direct immersion sampling modes. Where the multiwalled carbon nanotube dispersed in the organic solvent is held in the pores of a porous membrane supported by capillary forces and sonification. All microextraction experiments were supported using an Accurel Q3/2 polypropylene hollow fiber membrane (600 μm I.D., 200 μm wall thicknesses, 0.2μm pore size). The experimental setup is very simple and highly affordable. Among most of micro-extraction techniques reported, it is the most effective sample preparation/preconcentration technique. The hollow fiber is disposable, so single use of the fiber reduces risk of crosscontamination and carry-over problems. The proposed method allows the very effective and enriched recuperation of ionic analyte into MWCNTs/organic phase. In order to obtain high enrichment and extraction efficiency of the analyte using this novel technique, the main parameters were optimized. Under the optimized extraction conditions, the method showed good linearity, repeatability, low limits of detection and very excellent enrichment factor (EF = 950).

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