Zheng Jianbin, Zhang Ya, Yang Pingping
Institute of Analytical Science, Shaanxi Provincial Key Lab of Electroanalytical Chemistry, Northwest University, Xi'an, Shaanxi 710069, China.
Talanta. 2007 Oct 31;73(5):920-5. doi: 10.1016/j.talanta.2007.05.016. Epub 2007 May 21.
An ionic liquid-type carbon paste electrode (IL-CPE) had been fabricated by replacing non-conductive organic binders with a conductive room temperature ionic liquid, 1-pentyl-3-methylimidazolium hexafluorophosphate (PMIMPF(6)). The electrochemical responses of calcium dobesilate were investigated at the IL-CPE and the traditional carbon paste electrode (T-CPE) in 0.05molL(-1) H(2)SO(4), respectively. The results showed the superiority of IL-CPE to T-CPE in terms of provision of higher sensitivity, faster electron transfer and better reversibility. A novel method for determination of calcium dobesilate was proposed. The oxidation peak current was rectilinear with calcium dobesilate concentration in the range of 8.0x10(-7) to 1.0x10(-4)molL(-1), with a detection limit of 4.0x10(-7)molL(-1) (S/N=3) by differential pulse voltammetry. The proposed method was applied to directly determine calcium dobesilate in capsule and urine samples.
通过用导电室温离子液体1-戊基-3-甲基咪唑六氟磷酸盐（PMIMPF(6)）替代非导电有机粘合剂，制备了一种离子液体型碳糊电极（IL-CPE）。分别在IL-CPE和传统碳糊电极（T-CPE）上，于0.05molL(-1) H(2)SO(4)中研究了羟苯磺酸钙的电化学响应。结果表明，IL-CPE在提供更高灵敏度、更快电子转移和更好可逆性方面优于T-CPE。提出了一种测定羟苯磺酸钙的新方法。在8.0×10(-7)至1.0×10(-4)molL(-1)范围内，氧化峰电流与羟苯磺酸钙浓度呈线性关系，差分脉冲伏安法的检测限为4.0×10(-7)molL(-1)（S/N=3）。该方法用于直接测定胶囊和尿液样品中的羟苯磺酸钙。
