File Name : s1.tif Caption : fig.s1 ftir spectra of fe3o4 (a), fe3o4@sio2 (b), and fe3o4@sio2@pils (c). File Name : s2.tif Caption : fig.s2 vsm of fe3o4 (black), fe3o4@sio2 (red), and fe3o4@sio2@pils (blue). File Name : s3.tif Caption : fig.s3 effect of elution time. quantity of fe3o4@sio2@pils, 60 mg, vortex time, 25 min, eluent type, acetonitrilem, volume of eluent, 8 ml, concentration of suhs, 80ng/ml. File Name : s4.tif Caption : fig.s4 effect of ionic strength. quantity of fe3o4@sio2@pils, 60 mg, vortex time, 25 min, eluent type, acetonitrilem, volume of eluent, 8 ml, elution time, 8 mim, concentration of suhs, 80ng/ml. File Name : s5.tif Caption : fig.s5 reusability of the sorbent. quantity of fe3o4@sio2@pils, 60 mg, eluent type, acetonitrile, vortex time, 25 min, elution time, 8 min, elution volume, 8 ml, nacl addition, 0, concentration of suhs, 80ng/ml.