摘要
该文研究了基于水杨醛缩碳酰亚胺合钴(Ⅱ)[Co(Ⅱ)-SAU]为中性载体的PVC膜电极。该电极对水杨酸根离子(Sal-)具有良好的电位响应特性,且呈现反Hofmeister选择性行为,其选择性序列为:Sal->ClO4->I->SCN->NO2->NO3->Br->SO42->SO32->Cl-。在pH=4.0的磷酸盐缓冲体系中该电极具有最佳的电位响应,在1.0×10-1～9.0×10-6mol/L浓度范围内呈近能斯特响应,斜率为-54.9mV/decade(20℃),检测下限为7.0×10-6mol/L。采用紫外可见光谱技术研究了电极的响应机理,并将电极用于药品分析,结果比较满意。
A new highly salicylate - selective PVC membrane electrode based on salicylaldehyde -urea cobalt（ Ⅱ） complex [Co（ Ⅱ ） - SAU] as neutral carrier is described, which displays a excellent potentiometric response to salicylate ion and an anti- Hofmeister selectivity sequence in following order： Sal^-〉 ClO4^-〉 I^-〉 SCN^-〉 NO2^-〉 NO3 ^- 〉 Br^- 〉 SO4^2 - 〉 SO32 ^- 〉 Cl^-. The electrode exhibits near Nernstian potential linear range of 1.0 × 10^-1～ 9.0 × 10^-6 mol/L with a detection limit 7.0 × 10^-6 mol/L and a slope of -54. 9 mV/decade in pH 4. 0 of phosphorate buffer solution at 20 ℃. The response mechanism is discussed in view of the UV spectroscopy technique. The electrode is applied to medicine analysis with satisfactory results.
出处
《化学传感器》
CAS
2006年第4期44-47,共4页
Chemical Sensors
基金
国家自然科学基金资助项目(20675064)
西南大学高新技术培育基金资助(XSGX02)
