The Impact of Pesticides - Academy Publish

EXPERIMENTALMaterialsIsoproturon was purchased from Sigma-Aldrich (Steinheim, Germany), in analyticalpurity and used as received in the experiments directly. Solutions of isoproturon ofappropriate concentration were prepared by diluting a stock solution. The maincharacteristics of isoproturon are shown in Table 2.Table 2. Main characteristics of isoproturon.CompoundUse/categoryCASnumberMolecularweight(g.mol -1 )a LogK owa pKaa Watersolubility(mg.L -1 )MolecularformulaeSize(Å)b IsoproturonHerbicide34123-59-6206.32.87(exp)2.87(calc)n.a. 65C 12 H 18 N 2O7.4a SRC Physical Properties Database. Interactive PhysProp Database Demo, 2011;http://esc.syrres.com/interkow/physdemo.htm.b Known or suspected endocrine disrupting chemical.n.a.: Information not available (no dissociation).KowWin estimates the log octanol-water partition coefficient, log P, of chemicalsusing an atom/fragment contribution method developed at SRC.Granular activated carbon, Calgon Filtrasorb 400, having a specific area of 997.0m 2 .g -1 , external area of 384 m 2 .g -1 , microporous volume of 0.26 cm 3 .g - 1 and pH PZC =7.6 has been used as adsorbent ( P = 453.6 g.L -1 , P =0.410). Before use, theadsorbent was washed with water to remove surface impurities, followed by dryingat 100 ºC for 48 hours. The size fraction between 0.5 to 0.589 mm was selected bysieving.AcademyPublish.org - The Impact of Pesticides342