A new type of magnetic ion imprinted polymer nanoparticles was employed to quickly extract, concentrate, and measure Ni(II) ions in urine samples from foundry workers. The Box-Behnken design and response surface methodology were used to optimize the parameters that affect the preconcentration process. The main factors considered for sorption optimization were pH value (8), sorption time (10 min), and the amount of magnetic imprinted polymer (7 mg). The elution step was optimized by investigating four variables: type, volume, and concentration of the eluent, as well as elution time. Mentioned parameters were 3.8 mL of HCl 0.9 M, for 5 min. After the sorption and elution steps, flame atomic absorption spectrometry was used to quantify the Ni(II) ions.Equilibrium isotherms were studied, and two models were utilized to analyze the equilibrium sorption data. The results showed that the sorption process followed the Langmuir model. The maximum monolayer capacity and the Langmuir constant were49.3 mg g-1 and 0.205 L mg-1, respectively. Ultimately this nanosorbent was successfully applied to the selective determination of urinarynickel in foundry workersand satisfactory results were obtained. Under the optimalcondition the limit of detection and the relative standard deviations was 0.25 μg L-1 and were equal or less than 9.5%, respectively.