The partition behavior of Zn(II) has been studied in aqueous polyethylene glycol PEG(1550) - (NH4)(2)SO4 two-phase system using halide ions (Cl-, Br- I-) as extracting agents, at two different values of salt stock solution pH. The efficiency of extractants increase in this order: Cl- > Br- > I-. The extracted species were estimated from the distribution coefficients' values determined as a function of halide ions concentration, and the "conditional extraction constants" were calculated. The experimental results suggest that the Zn(II) partition in presence of halide ions in such systems is the result of two competitive processes. The IR spectra of solidified PEG-rich phases show that the passing of metal species into PEG-rich phases bring a supplementary water contribution, which makes the extraction process to occurs until it reaches an "equilibrium state", dependent on the hydrophobicity of these phases and not on the type of extracted metal species.