维生素B_2在电化学预处理玻碳电极上的电化学行为及其痕量测定

Electrochemical Behavior and Trace Determination of Vitamin B_2 at Electrochemically Pretreated Glassy Carbon Electrode

用阳极氧化和循环扫描的方法电化学预处理得到的玻碳电极(PGCE)有一对可逆的氧化还原峰(Epa=- 0.0 73V,Epc =0.0 4 4V).PGCE能大大提高水溶性的维生素如维生素B2(VB2 )的电化学响应.实验表明VB2 在PGCE上是吸附行为.PGCE具有很强的稳定性,用其能测定痕量的VB2 和复合维生素片剂中的VB2 ,结果令人满意.

An electrochemically pretreated glassy carbon electrode (PGCE) was achieved by anodic oxidation at 1.8?V and following potential cycling in the potential range from -0.8 to+1.0?V. The resulting PGCE gave well-defined redox peaks with E pa =-0.073?V, E pc =0.044?V. The PGCE showed good activity in improving the electrochemical responses of some water soluble Vitamin B 2 (VB 2), VB 2 could be adsorbed at PGCE. The PGCE was rather stable and can be used to trace determination of VB 2, and VB 2 in multivitamin vitamin tablets.