3mm glass carbon electrode imported glassy materials gold-plated copper rod high temperature resistant | Инструменты

Carbon glass is referred to as glassy carbon, polyacrylonitrile resin or phenolic resin in an inert atmosphere slowly heated to a high temperature (1800 DEG C) of amorphous carbon into shape like glass, suitable for electronic conductor as electrode material, has been widely used in table tennis in the. Glassy carbon electrode. The advantages of glass carbon electrode is of good conductivity, high chemical stability, low thermal expansion coefficient, hard texture, good air tightness, wide range of application potential (about from -1 to 1V, with respect to the saturated calomel electrode), can be made into a cylinder, disc electrode shape, use it as a matrix can be made into a mercury film electrode and chemical modified electrode. It has been widely used in electrochemical experiments or electroanalytical chemistry. Electrode characteristics: The glassy carbon electrode is the working electrode of a wide range of uses, it is a kind of inert electrode good, has good conductivity, high hardness, high smoothness, high hydrogen overpotential, polarization range, chemical stability, can be directly used as inert electrode cathode and anodic stripping voltammetric determination of valence ions. Can also be used for chemical modified electrode. Electrode handling and maintenance: Must ensure that the surface of the glass carbon mirror and clean. Because the glass carbon surface vulnerable to some organic compounds pollution, which seriously affect the measurement (not a peak, a miscellaneous peak, not reproduce) before the measurement must be so clean, there are three main methods, chemical methods 1 nitric acid soaking and scrubbing. In 2 Ammonia ethanol or ethyl acetate 1:1 soaking scrub. 3 can also be used to scrub alcohol and then soaked in 6NHCL or 4NHO3. Electrochemical treatment: in the +0.8V- (0.5MKcLPH7 -1.8V (except O2I conditions) voltage range of repeated times (reset - polarization scan) (anode cathode to cathode) if serious pollution and pits, scratches can be used for mechanical processing, MgO powder (over 200 mesh) on the wet cloth, plus a small amount of water polishing. Can also be Several methods were combined according to the electrode conditions. It is not suitable for long time to immerse the electrode in strong acid alkali and organic solvent. Due to the fact that the glassy carbon electrode is an inert electrode, the scanning electrode is used as the scanning electrode, such as mercury, copper, gold, mercury film, copper film, gold film electrode. For example: mercury plating and gold anodic stripping, glassy carbon mercury plating has two kinds: the first one is that Mercury plated, adding a certain amount of samples to be analyzed in Hg+ (and in general use of mercuric nitrate mercuric oxide) to the ion Electrolytic Enrichment point, while the formation of amalgam, scanning dissolution, in the potential is positive, completely dissolved ions or mercury film to be measured, it can remove the mercury film electrode with filter paper wipe. To ensure the second analysis when the electrode surface is still the original state, in order to ensure reproducibility, concentration of mercury ion is 500-1000 times the measured ion concentration, second to 1 in the mercury plating film to be measured under long time electrolysis potential electrodeposition of mercury ion. Such as Cu can be measured in the -0.2V for a long time to produce mercury film, and prevent the risk of electrowinning Cu, Pb, CD, Zn, this method is low efficiency, long time. 2 in the isochronous mercury plating conditions, electrowinning production after a period of time, scanning dissolution, termination and dissolution potential in general time, dissolved ions to be measured, so the enrichment and dissolution, repeated several times to obtain a layer containing the analyte ion of the mercury film. Such as 0.5MKCL+2 * 10-2MHg+ ten drops of saturated NaSO3, -1.4V to 5-10 minutes mixing concentration, stirring state in 15 seconds to scan to -0.1V, continue to stir the dissolution of 30 seconds in -0.1V, then in the reset state under stirring enrichment 5-10 minutes, 15 seconds stirring scan to -0.1V, then stir the dissolution of 30 seconds at -0.1V. A solution after removing the electrode, rinse the electrode rod to prevent coating break. Mercury plating should pay attention to the electrode under no bubble sorption, otherwise uneven plating coating mercury on the electrode without short-term soak in 1:1 nitric acid, then wash with plating, not long to be mercury washed, dried and preserved. The basic principle of glass carbon gold plating is the same as that of mercury plating. Shanghai Yue Magnetic Electronic Technology Co., Ltd. Tel: 021-65899569