An electrically heated microelectrode chip （HMEC） was designed and the Ru（bpy）3^2＋/carbofuran electro- chemiluminescence （ECL） systems were applied to characterize the performance of the HMEC. The ECL intensities increase at elevated electrode temperature, and the detection limit at 60℃ （electrode surface temperature） was about 10 times lower than that at 30℃. The results indicate that new heated electrode can be handled easily and can be mass produced, the difference between the electrodes was little. The stability of the HMEC was good since the electrode surface can hardly be destroyed during detection and storage.
A carbon fiber paste electrode using ionic liquid as the binder （CFILE） was fabricated. The electrochemical characteristics of the electrode was examined in ferro-/ferricyanide solution and showed better conductivity and reversibility when compared with graphite paste-ionic liquid electrode （GPILE） and a little better than that on the carbon nanotube paste-ionic liquid electrode （CNTILE）. Glyphosate （GLY）, a pesticide, exhibited excellent catalysis to the oxidation of Ru（bpy）3^2＋ on CFILE and brought an obvious enhancement to the electrochemiluminescence （ECL） intensity of Ru（bpy）3^2＋ . Based on the catalytic ability of GLY, a simple ECL method for GLY detection had been established. Under optimum conditions, the enhanced ECL intensities were found to had linearly respond to the GLY concentration between 3.0× 10 ^-7 and 3.0× 10 ^- 5mol/L, and the detection limit （S/N=3） was 2.0× 10 ^-7 mol/L. The electrode also showed excellent sensitivity in detecting GLY-spiked soybean samples. The linear range for GLY in soybean samples was 1.0× 10 ^-6-4.0× 10 ^-5 mol/L and the detection limit was 5.0× 10 ^-7 mol/L, equal to 8.45 μg GLY in per gram of soybean. The detection limit in soybean sample was lower than the USA, EU regulation and so on. If the method is coupled with the separation technology, it can be applied to detect the GLY in the contaminated samples.
