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Laser-induced breakdown spectroscopy electrochemical combined heavy metal detection method

A technology of laser-induced breakdown and spectroelectrochemistry, which is applied in the field of analytical chemistry, can solve the problems of variable pH value, complex background, and mutual interference of electrochemical behavior of heavy metal pollutants, and achieve the effect of non-interference detection and overcoming interference problems

Inactive Publication Date: 2018-12-18
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, its accurate analysis still faces great challenges, mainly due to: ① the actual water body has a complex environmental background, contains a large amount of inorganic mineral salts and organic matter, and the pH value is variable; ② heavy metal pollutants have various components and forms, and heavy metals The electrochemical behavior of pollutants interferes seriously

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  • Laser-induced breakdown spectroscopy electrochemical combined heavy metal detection method
  • Laser-induced breakdown spectroscopy electrochemical combined heavy metal detection method
  • Laser-induced breakdown spectroscopy electrochemical combined heavy metal detection method

Examples

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Embodiment 1

[0041] Example 1: In situ detection of Cr(VI) in aqueous solution by laser-induced breakdown spectroelectrochemical

[0042] Hexavalent chromium (Cr(VI)) is a heavy metal pollutant that is very harmful to human health. Cr(VI) in water is mainly HCrO 4 - form exists.

[0043] The specific detection scheme for detecting hexavalent chromium in the water environment by the laser-induced breakdown spectroelectrochemical method combined with heavy metal detection in the present invention is as follows.

[0044] First, 20 μL of chitosan-modified graphene suspension containing 5 mg / mL was evenly dropped onto the titanium sheet with a pipette gun. The titanium sheet had a purity of 99.99% and a thickness of 0.25 mm. Chitosan-modified graphene increases the adsorption to HCrO by electrostatic adsorption 4 - The adsorption makes more HCrO 4 - adsorbed on the working electrode.

[0045] Second, a positive voltage of 1.5V was applied on the working electrode for 600s to drive the H...

Embodiment 2

[0048] Example 2 Laser-induced breakdown spectroelectrochemistry realizes interference-free detection of Cd in rice:

[0049] Cadmium (Cd) is highly toxic and widely distributed in soil. Cd pollution in the soil is easy to make cars "poisonous rice". It is necessary to detect the Cd content in rice. However, the composition of rice is complex, rich in various inorganic and organic substances, and the content is usually more than tens of times higher than the concentration of Cd. How to accurately detect the Cd concentration in rice without interference is an urgent problem to be overcome. Laser-induced breakdown spectroelectrochemistry enables accurate and interference-free detection of Cd pollutants in real rice environments.

[0050] First, the titanium sheet is ultrasonically cleaned in acetone, and the cleaned titanium sheet is immersed in a solution containing polydiallyldimethylammonium chloride for 10 minutes to make the surface of the titanium sheet positively charg...

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Abstract

The invention discloses a laser-induced breakdown spectroscopy electrochemical combined heavy metal detection method. According to the method, heavy metal ions are reduced to heavy metal through an electrochemical system and an electrochemical analysis method and then enriched on working electrodes; and contents of heavy metal pollutants are measured in situ by utilizing a laser-induced breakdownspectroscopy system. According to the method, laser-induced breakdown spectroscopy and electrochemistry are combined so that contents of heavy metal ions in complicated real environment can be conveniently and rapidly detected in situ; the interference problems of traditional electrochemistry and the height detection limit problems of traditional laser-induced breakdown spectroscopy are overcome,and the contents of the heavy metal ions can be detected via high sensitivity without interferences; and electrode surface state changes in the electrochemical analysis process can be represented in situ so as to disclose interference mechanisms of electrochemical behaviors among heavy metal pollutants.

Description

technical field [0001] The invention relates to the technical field of analytical chemistry, in particular to a heavy metal detection method combined with laser-induced breakdown spectroelectrochemistry. Background technique [0002] At present, the problem of water environmental pollution is becoming increasingly prominent, especially heavy metal pollution. Human factors such as mining, metal smelting, chemical production wastewater, application of pesticides and fertilizers, and domestic garbage, as well as natural factors such as geological erosion and weathering, all lead to heavy metals entering water bodies in various forms. Its trace concentration produces toxic effects and has persistent, cumulative and magnified effects, causing serious threats to the ecological environment and human life and health. Surveillance is the foundation of prevention and governance. However, the composition and form of heavy metal pollutants in water bodies are easily changed by environ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/71G01N27/26
CPCG01N21/718G01N27/26
Inventor 黄行九江敏杨猛赵南京马明俊方丽李珊珊刘锦淮
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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