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Method for producing chemical modified carbon paste bismuth membrane electrode

A technology of chemical modification and carbon paste electrode, applied in the direction of material electrochemical variables, etc., can solve the problems of poor electrode reproducibility, low detection limit, poor electrode stability, etc., and achieve the effect of low pretreatment requirements, high sensitivity and simple operation

Inactive Publication Date: 2009-12-16
CHANGZHOU INST OF ENERGY STORAGE MATERIALS &DEVICES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the pretreatment steps of the electrode in the above method are cumbersome, more complicated, and the cost is higher, and it is not easy to carry out daily analysis; S.Legeai et al. Although the matrix can realize the determination of heavy metal ions under certain conditions, the stability of the electrode is poor; A. Krolicka et al. [Electrochem. Method for preparing bismuth film electrode as substrate
Although this method is simple to manufacture and low in price; however, the electrode has poor reproducibility, low detection limit, and high requirements for sample pretreatment conditions, which is not conducive to practical analysis and application.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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 1000μg / LBi(III), 0.1M (pH4.0), using a three-electrode system, and the Ag / AgCl / KCl (saturated aqueous solution) electrode was The reference electrode, the platinum sheet electrode is the counter electrode, and the chemically modified carbon paste electrode is the working electrode; the method of constant potential deposition deposits u...

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 acetic acid buffer solution with a concentration of 1500 μg / L Bi(III), 0.1M (pH4.2), using a three-electrode system, and the Ag / AgCl / KCl (saturated aqueous solution) electrode as the reference electrode, The platinum sheet electrode was used as the counter electrode, and the chemically modifie...

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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Abstract

The invention belongs to a preparation method of a chemically modified carbon paste bismuth film electrode. The method is to uniformly mix and grind carbon powder, modifier and hydrophobic organic solvent to form a carbon paste, then put it into an electrode shell plugged with a copper screw rod of comparable size, and compact it to form a carbon paste electrode; wherein, the modifier is artificial Zeolite, hydrophobic organic solvent is methyl silicone oil or paraffin oil. In the sample solution containing bismuth ions, the potential is applied by differential pulse voltammetry to carry out constant potential deposition, and the chemically modified carbon paste bismuth film electrode can be obtained; or the carbon paste electrode is placed in the sample test solution added with bismuth ions, through Differential pulse voltammetry applied potential for potentiostatic deposition for in situ bismuth coating and detection of heavy metal ions. By applying the invention, the heavy metal ion in the water sample can be detected conveniently, quickly and sensitively.

Description

technical field [0001] The invention belongs to a preparation method of a chemically modified carbon paste bismuth film electrode. Background technique [0002] Heavy metals are very dangerous pollutants, which tend to accumulate in organisms for a long time and cannot be degraded. In extremely small amounts, they will also have adverse consequences. Therefore, the quantitative analysis of trace heavy metals is widely used in medicine, food, clinical and environmental testing. is very important. The traditional electrochemical detection method is to use a mercury electrode as a working electrode, and organically combine pre-enrichment and electrochemical measurement with the help of stripping voltammetry to carry out the determination and analysis of heavy metal ions. However, mercury is highly toxic and volatile, which is harmful to the health of workers and causes great pollution to the environment. Therefore, the use of mercury is greatly restricted and even banned in s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/30
Inventor 郏建波曹林园汪振辉
Owner CHANGZHOU INST OF ENERGY STORAGE MATERIALS &DEVICES
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