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A simple, rapid and sensitive method was developed for the selective separation and preconcentration of Ni(II) using dispersive liquid–liquid microextraction, by a yellow Schiff's base bisazanyl derivative, as a selective complexing agent. In this method, a mixture of 45μL chloroform (extraction solvent) and 450μL tetrahydrofuran (dispersive solvent) is rapidly injected by syringe into a 5mL aqueous...
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