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Polymer film modified electrode and preparation method and application thereof

A technology for modifying electrodes and polymer membranes, applied in the field of electroanalytical chemistry, can solve problems such as harm to human health, complex operation, enrichment, etc., and achieve the effects of enhanced sensitivity, good reproducibility, and simple preparation

Active Publication Date: 2021-03-26
SHANXI AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Metal cadmium cannot be biodegraded and is easy to accumulate in the human body, seriously endangering human health
[0003] At present, the detection methods of cadmium ions include neutron activity analysis, atomic absorption spectrometry, X-ray fluorescence spectrometry, inductively coupled plasma mass spectrometry, atomic emission spectrometry, etc. The instruments and equipment used in these analytical methods are expensive and the maintenance cost is high. The operation is complicated; the polymer membrane modified electrode has the advantages of low equipment price, fast analysis speed, high sensitivity and good selectivity, and is a feasible and effective analytical method for the determination of cadmium ions

Method used

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  • Polymer film modified electrode and preparation method and application thereof
  • Polymer film modified electrode and preparation method and application thereof
  • Polymer film modified electrode and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) The glassy carbon electrode (Φ=3mm) is made of 0.05μm Al 2 o 3 The polishing powder is polished into a mirror surface, followed by HNO with a volume ratio of 1:1 3 , anhydrous ethanol and double distilled water were ultrasonically cleaned for 4 minutes.

[0030] (2) Place the electrode cleaned in step (1) in 1.0mol / L H 2 SO 4 Carry out cyclic voltammetry scan in the range of -0.40 ~ 1.80V, until a stable cyclic voltammogram is obtained.

[0031] (3) The glassy carbon electrode pretreated in step (2) is used as a working electrode, the saturated calomel electrode is a reference electrode, and the platinum wire is a counter electrode, and the three-electrode system is placed in a phosphate buffer solution of pH=4.0, Then add 0.5mmol / L dibromofluorescein, the concentration of phosphate in the mixture is 0.1mol / L, in the range of -0.42 ~ 1.82V, scan cyclically at a scan rate of 100mV / s for 20 weeks to obtain polydibromofluorescein Fluorescein Modified Electrode (Po...

Embodiment 2

[0034] (1) The glassy carbon electrode (Φ=3mm) is made of 0.05μm Al 2 o 3 The polishing powder is polished into a mirror surface, followed by HNO with a volume ratio of 1:1 3 , absolute ethanol and twice distilled water, respectively, for ultrasonic cleaning for 5 min.

[0035] (2) Place the electrode cleaned in step (1) in 0.5mol / L H 2 SO 4 Carry out cyclic voltammetry scanning in the range of -0.4 ~ 1.8V until a stable cyclic voltammetry is obtained.

[0036] (3) The glassy carbon electrode pretreated in step (2) is used as a working electrode, the saturated calomel electrode is a reference electrode, and the platinum wire is a counter electrode, and the three-electrode system is placed in a phosphate buffer solution of pH=5.0, Then add 1.0mmol / L dibromofluorescein, the concentration of phosphate in the mixture is 0.1mol / L, in the range of -0.42 ~ 1.82V, scan 30 weeks at a scanning rate of 100mV / s, and obtain polydibromofluorescein Fluorescein Modified Electrode (Poly(D...

Embodiment 3

[0039] (1) The glassy carbon electrode (Φ=3mm) is made of 0.05μm Al 2 o 3 The polishing powder is polished into a mirror surface, followed by HNO with a volume ratio of 1:1 3 , anhydrous ethanol and double distilled water were ultrasonically cleaned for 6 min.

[0040] (2) Place the electrode cleaned in step (1) in 1.5mol / L H 2 SO 4 Carry out cyclic voltammetry scanning in the range of -0.4 ~ 1.8V until a stable cyclic voltammetry is obtained.

[0041] (3) The glassy carbon electrode pretreated in step (2) is used as a working electrode, the saturated calomel electrode is a reference electrode, and the platinum wire is a counter electrode, and the three-electrode system is placed in a phosphate buffer solution of pH=6.0, Then add 1.5mmol / L dibromofluorescein, the concentration of phosphate in the mixture is 0.1mol / L, in the range of -0.42 ~ 1.82V, scan 40 cycles at a scan rate of 100mV / s to obtain polydibromofluorescein Fluorescein Modified Electrode (Poly(DBF) / GCE). The...

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Abstract

The invention belongs to the technical field of electroanalytical chemistry, and discloses preparation of a bismuth film / polydibromo fluorescein modified electrode and a method for determining the concentration of Cd < 2 + > in farmland irrigation water. The preparation process of the modified electrode comprises the following steps: electrochemically polymerizing dibromo fluorescein molecules tothe surface of a glassy carbon electrode through cyclic voltammetry to prepare a polydibromo fluorescein membrane chemically modified electrode (recorded as Poly (DBF) / GCE), and then adding a proper amount of bismuth ions to prepare a bismuth membrane / polydibromo fluorescein membrane modified electrode (Bi / Poly (DBF) / GCE) through adsorption. By utilizing the modified electrode, a novel, sensitive,accurate and simple electrochemical method is established to determine the trace Cd < 2 + > in a water sample through anodic stripping differential pulse voltammetry.

Description

technical field [0001] The invention belongs to the technical field of electroanalytical chemistry. The invention discloses the preparation of a bismuth film / polydibromofluorescein modified electrode and the determination of Cd in farmland irrigation water. 2+ method of concentration. Background technique [0002] With the rapid development of my country's economy, environmental issues have become a major issue affecting human survival and development. Arbitrary discharge of heavy metal ions is one of the main sources of environmental pollution. Heavy metal cadmium is widely used in electroplating industry, chemical industry and other fields, and it is discharged into the environment through wastewater, causing pollution. Metal cadmium cannot be biodegraded and easily accumulates in the human body, seriously endangering human health. [0003] At present, the detection methods of cadmium ions include neutron activity analysis, atomic absorption spectrometry, X-ray fluoresc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/30G01N27/48
CPCG01N27/308G01N27/48
Inventor 王红宁闫建康孙俊宝张生智
Owner SHANXI AGRI UNIV
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