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Lead ion specific detection sensor and preparation method and using method thereof

A technology for detecting sensors and lead ions, applied in the field of detection sensors, can solve the problems of simple, fast, specific detection, complex processing, time-consuming and other problems of unfavorable lead ions, and achieves outstanding electrochemical performance, stable material structure, and heavy electrode. good effect

Inactive Publication Date: 2012-08-22
HUNAN UNIV
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Problems solved by technology

At present, the methods for detecting lead ions include inductively coupled plasma-mass spectrometry, graphite furnace atomic absorption spectrometry, and atomic fluorescence spectrometry. Simple, rapid and specific detection of lead ions

Method used

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  • Lead ion specific detection sensor and preparation method and using method thereof
  • Lead ion specific detection sensor and preparation method and using method thereof
  • Lead ion specific detection sensor and preparation method and using method thereof

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Embodiment Construction

[0038] The present invention will be further described below in conjunction with the examples, rather than limiting the present invention.

[0039] By using the method of the present invention, the inventor has realized the simple, rapid and specific detection of lead ions in the soil somewhere in the Xiangjiang River.

[0040] 1. Extraction of lead ions in soil: Mix 1 g of soil from a certain place in the Xiangjiang River with 5 mL of ultrapure water for 2.5 hours under ultrasonic conditions; use 80kDa dialysis membrane to filter and remove the precipitate, and obtain the extracted sample for testing.

[0041] 2. Detection of lead ions in soil:

[0042] Add 4.5 mg of graphite oxide to the prepared 10 mL of phosphate buffer solution with a pH value of 4.5 and a concentration of 0.1 mol / L; ultrasonically oscillate for 3 hours to obtain a uniformly dispersed graphene oxide solution;

[0043] Add 10.5 mg of chitosan to the prepared 5 mL of phosphate buffer solution with a pH val...

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Abstract

The invention discloses a lead ion specific detection sensor and a preparation method and a using method thereof. The sensor comprises a three-electrode system, wherein a glassy carbon electrode for depositing graphite, chitosan and Au nanoparticles is used as a working electrode of the system, a platinum sheet is used as a counter electrode, and a calomel electrode is used as a reference electrode. When in detection, in the three-electrode system in which the glassy carbon electrode for depositing graphite, chitosan and Au nanoparticles is used as the working electrode, the platinum sheet is used as the counter electrode and the calomel electrode is used as the reference electrode, an electrochemical workstation is used for performing constant-potential lead ion pre-enrichment; and after the enrichment is finished, the lead ion is detected by a differential pulse working mode. Through the detection sensor, simple and quick specific detection on the lead ion is realized; the lead ion with concentration as low as 0.01ug / L can be detected by the method; meanwhile, the lead ion sensor is simple to prepare, has stable performance and can be repeatedly used; and the sample detection time is short, and the operation is convenient.

Description

Technical field: [0001] The invention relates to a simple, rapid and specific detection sensor for lead ions based on a graphene composite material and a new method for its preparation and use Background technique: [0002] Lead ion is a heavy metal pollutant that seriously endangers human health. Due to its many sources of pollution and non-degradability, lead ions exist in the environment for a long time and will enter the human body through various channels such as drinking water or food chain transmission. Lead ions or their compounds first enter the blood, then quickly precipitate on the soft tissue, and then enter the bone tissue. The residual time can be as long as ten years, thus causing irreversible damage to the brain, kidney and nervous system of the human body. . Therefore, realizing the simple, rapid and specific detection of lead ions is of great significance for detecting the pollution degree of lead ions in the environment and studying its biological toxici...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/48G01N27/30
Inventor 罗胜联杨善丽路珍珍梁杰生刘承斌
Owner HUNAN UNIV
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