CAJ | 학술논문

研究了吡硫醇在单壁碳纳米管修饰电极上的电化学行为,提出了一种检测吡硫醇的电化学方法.在0.1 mol/L的NaAc-HAc(pH 4.0)缓冲溶液中,吡硫醇在单壁碳纳米管修饰电极上出现一灵敏的氧化峰,峰电位位于0094 V处.与裸玻碳电极相比,单壁碳纳米管修饰电极显著提高了吡硫醇的氧化峰电流.在最佳实验条件下,吡硫醇浓度在9.9×10~(-6)～5.7×10~(-4) mol/L范围内与峰电流呈良好的线性关系,检出限为2.98×10~(-7) mol/L.吡硫醇在单壁碳纳米管修饰电极上的氧化过程受吸附控制,为1电子2质子的过程.
연구료필류순재단벽탄납미관수식전겁상적전화학행위,제출료일충검측필류순적전화학방법.재0.1 mol/L적NaAc-HAc(pH 4.0)완충용액중,필류순재단벽탄납미관수식전겁상출현일령민적양화봉,봉전위위우0094 V처.여라파탄전겁상비,단벽탄납미관수식전겁현저제고료필류순적양화봉전류.재최가실험조건하,필류순농도재9.9×10~(-6)～5.7×10~(-4) mol/L범위내여봉전류정량호적선성관계,검출한위2.98×10~(-7) mol/L.필류순재단벽탄납미관수식전겁상적양화과정수흡부공제,위1전자2질자적과정.
The electrochemical behavior of pyritinol at the single-wall carbon nanotube (SWNT)-modified electrode is investigated. In a 0.10 mol/L NaAc-HAc buffer (pH 4.0), pyritinol exhibits a well-defned and sensitive oxidation peak at the SWNT-modified electrode. The oxidation peak potential is at ca. 0.94 V (vs. SCE). The oxidation peak current of pyritinol significantly increases at the SWNT-modified electrode in comparison with that at the bare elec-trode. Under the optimum conditions, the oxidation peak current is proportional to the concentration of pyritinol over the range from 9.9×10~(-6) to 5.7×10~(-4) mol/L, and the detection limit is 2.98×10~(-7) mol/L. The electrode process is controlled by adsorption, and one electron and two protons are involved in the oxidation of pyritinol.