【摘要】 采用平行催化波法、循环伏安法等手段研究了在KH2PO4-Na2HPO4介质中过二硫酸钾存在下曲匹布通平行催化波产生的机理。曲匹布通的羰基官能团C=O在KH2PO4-Na2HPO4介质中以2e-,2H+方式极谱还原,产生了单个还原波。加入氧化剂过二硫酸钾时,曲匹布通还原中间体自由基在电极表面上能被过二硫酸钾及其中间还原体硫酸根阴离子自由基氧化,再生为原可还原基团C=O,从而产生了曲匹布通的平行催化波。基于此,提出了一种测定曲匹布通的新方法。更多还原

【Abstract】 The parallel catalytic wave of trepibutone in the presence of persulfate was studied by linear potential scan polarography and cyclic voltammetry.The reduction wave of trepibutone appearee at ca.-1.12 V(vs.SCE) in 0.20 mol/L KH2PO4-Na2HPO4(pH 5.5) supporting electrolyte.In the presence of K2S2O8,the reduction wave is catalyzed to produce a parallel catalytic wave.Based on the catalytic wave,a novel method for the determination of trepibutone is proposed.The peak current of the catalytic wave is rectilinear to trepibutone concentration in the range of 2.0×10-7～1.6×10-5 mol/L.The detection limit is 1.0×10-7 mol/L.The peak current of the catalytic wave is ca.15 times higher than that of the corresponding reduction wave.Trepibutone yielded a single reduction wave in KH2PO4-Na2HPO4 solution,which was ascribed to a 2e-,2H+ reduction process of the carbonyl group.When S2O82-was added into the trepibutone-KH2PO4-Na2HPO4 solution,the free radical of trepibutone was oxidized by both S2O82-and sulfate radical anion,its reduction intermediate,to regenerate the original carboxyl group,which resulted in the production of a parallel catalytic wave of trepibutone. Based on this catalytic wave,a novel method for the determination of trepibutone was proposed.更多还原