摘要
将有序介孔碳(OMC)分散于壳聚糖(CTS)溶液,并用于修饰玻碳电极,制成有序介孔碳-壳聚糖修饰玻碳电极(OMC-CTS/GCE),用差分脉冲溶出伏安法研究锡(Ⅱ)在该电极上的溶出伏安特性。实验发现,在1.0mol/L盐酸中,锡(Ⅱ)在-1.2V处被富集在修饰电极表面,在0.0～+1.0V电位范围,以100mV/s的速率扫描,锡(Ⅱ)在+0.35V处产生一灵敏的溶出峰,峰电流与锡(Ⅱ)的浓度在5.0×10-8～1.0×10-5mol/L范围内呈良好的线性关系,检出限(S/N=3)为2.2×10-9 mol/L。方法用于合金中痕量锡(Ⅱ)的测定,结果同火焰原子吸收光谱法(FAAS)测定结果一致。
Ordered mesoporous carbon（OMC） was dispersed in chitosan（CTS） solution,and the surface of glassy carbon electrode（GCE） was modified by the obtained mixture to prepare ordered mesoporous carbon-chitosan modified glass carbon electrode（OMC-CTS/GCE）. The stripping behavior of stannum（Ⅱ） at this electrode was studied by differential pulse stripping voltammetry. An improved method for the determination of trace amount of stannum（ Ⅱ ） was reported by optimizing test conditions. It was found that in 1.0 mol/L HC1 solution,stannum（ Ⅱ ） was accumulated on the surface of the modified electrode at -1.2 V. Furthermore,at the potential range of 0.0-＋1.0 V with the scanning rate of 100 mV/s,a sensitive differential pulse stripping peak was detected at ＋0. 35 V（vs. SCE） by the OMC-CTS/GC electrode. The peak current showed good linear relationship with the concentration of stannum（ Ⅱ） in the range of 5.0× 10-8-1.0× 10 -5 mol/L. The detection limit of stannum（ Ⅱ ） was 2.2× 10 -9 mol/L （S/N=3）. This method can be applied in the determination of trace amount of stannum（ Ⅱ ） in alloy, and the result was consistent with that obtained from flame atomic absorption spectrometry method.
出处
《分析科学学报》
CAS
CSCD
北大核心
2013年第5期689-692,共4页
Journal of Analytical Science
关键词
有序介孔碳
壳聚糖
修饰玻碳电极
锡(Ⅱ)
Ordered mesoporous carbon Chitosan Modified glass carbon electrode
Stannum（ Ⅱ ）
