| 摘要 |
PURPOSE:To improve the stability of a base current in a carbon electrode and thereby to improve the precision in analysis and reproducibility, by a method wherein the density and the size of an opening existing in a working electrode are set at specified values. CONSTITUTION:A sample liquid to be quantified is supplied from a high-speed liquid chromatography 1 into an introduction port 2, made to contact with a working electrode 4 covered with a Teflon seal 3, made further to contact with a reference electrode 5 and then discharged from a discharge port 7 to which an auxiliary electrode 6 is fitted. Between the working electrode 4 and the reference electrode 5 a voltage is impressed from a power source 8. A current value of the working electrode 4 is relation to the eluation volume of the sample liquid passing from the introduction port 2 to the discharge port 7 is measured for analysis by a current measuring device 9. Besides, the working electroe 4 has openings whose density is 2X10<3>/mm<2> bellow and whose maximum diameter is 0.5mum or below, and it is formed of an isotropic carbon material. By using a surface-polished vitreous carbon material as this carbon material, S/N can be improved and thus a stable analysis can be attained. |
