Method for producing carbon magma bismuth membrane electrode
A chemical modification and carbon paste electrode technology, which is applied in the direction of material electrochemical variables, can solve the problems of poor electrode reproducibility, low detection limit, and poor electrode stability, and achieve low pretreatment requirements, fast detection, and good stability. Effect
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Embodiment 1
[0017] Take 95mg of carbon powder and 5mg of artificial zeolite and mix thoroughly, then add 20μL of methyl silicone oil, grind carefully in a mortar for several minutes to obtain a uniform and stable carbon paste mixture, and then use a small spoon to fill the carbon paste mixture with a length of 4cm and an inner diameter of 1mm, one end is plugged into a PTFE electrode shell with a length of 5cm and a diameter of about 1mm. The copper screw rod is inserted into the electrode shell and the length is about 3cm. The surface of the carbon paste electrode was polished to a smooth surface, placed in an acetate buffer solution with a concentration of 1000 μg / LBi(III), 0.1M (pH 4.0), using a three-electrode system, and the Ag / AgCl / KCl (saturated aqueous solution) electrode was used as a reference As the specific electrode, the platinum sheet electrode was used as the counter electrode, and the chemically modified carbon paste electrode was used as the working electrode; the method o...
Embodiment 2
[0019] Take 90mg of carbon powder and 10mg of artificial zeolite and mix thoroughly, then add 25μL of paraffin oil, grind carefully in a mortar for several minutes to obtain a uniform and stable carbon paste mixture, then use a small spoon to fill the carbon paste mixture into a 5cm long, 4mm inner diameter , one end is plugged into a plastic electrode shell with a length of 6 cm and a diameter of 4 mm. The copper screw rod is inserted into the electrode shell with a length of about 4 cm. The carbon paste mixture is used to obtain a chemically modified carbon paste electrode, and the surface of the chemically modified carbon paste electrode is polished. into a smooth surface, placed in an acetate buffer solution with a concentration of 1500 μg / L Bi(III), 0.1M (pH 4.2), using a three-electrode system, with the Ag / AgCl / KCl (saturated aqueous solution) electrode as the reference electrode, platinum The sheet electrode is the counter electrode, and the chemically modified carbon pa...
Embodiment 3
[0021] Take 98mg of carbon powder and 2mg of artificial zeolite and mix thoroughly, then add 30μL of methyl silicone oil, grind carefully in a mortar for several minutes to obtain a uniform and stable carbon paste mixture, and then use a small spoon to fill the carbon paste mixture with a length of 6cm and an inner diameter of 3mm, one end is plugged into a glass electrode shell with a length of 7cm and a diameter of 3mm. The copper screw rod is inserted into the electrode shell and the length is about 5cm. The carbon paste mixture is used to obtain a chemically modified carbon paste electrode, and the surface of the chemically modified carbon paste electrode is Polished to a smooth surface, placed in an acetic acid buffer solution with a concentration of 500μg / L Bi(III), 0.1M (pH4.5), using a three-electrode system, and the Ag / AgCl / KCl (saturated aqueous solution) electrode as the reference electrode , the platinum sheet electrode is the counter electrode, and the chemically m...
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