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A kind of arsenic ion detection method

A detection method and technology for arsenic ions, applied in the field of analytical chemistry, can solve the problems of high detection limit and difficult to achieve trace detection, and achieve the effect of reducing background fluorescence, reducing detection limit and improving sensitivity

Active Publication Date: 2021-04-09
INST OF ELECTRONICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The current colorimetric method is mainly combined with nanoparticles to achieve high-sensitivity detection, but still has the disadvantage of high detection limit, which makes it difficult to meet the requirements of trace detection

Method used

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  • A kind of arsenic ion detection method
  • A kind of arsenic ion detection method
  • A kind of arsenic ion detection method

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0032] This embodiment proposes a method for detecting arsenic ions, which is based on the fluorescence inner filter effect for detection, such as figure 1 As shown, the methods include:

[0033] S1, mixing the specific ligand-modified nano-metal particle solution with the quantum dot solution, and the specific ligand-modified nano-metal particle absorbs the excitation light and emitted fluorescence of the quantum dot.

[0034] In the above step S1, after the specific ligand-modified nano-metal particle solution is mixed with the quantum dot solution, a fluorescent inner filter effect sensor is formed, wherein the specific ligand-modified nano-metal particle is used as a fluorescent absorber, and the quantum dot is used as a fluorescent emitter. body. Since the use of specific ligand-modified nano-metal particles can cause the fluorescence quenching of quantum dots, therefore, when the specific ligand-modified nano-metal particles solution is mixed with the quantum dot soluti...

Embodiment 2

[0046] The difference from Embodiment 1 is that the quantum dots used in this embodiment are quantum dots containing heavy metal ions, because the actual detection requirements are different, and the quantum dots used are different. When the quantum dots are different, the order of adding them in the detection process will affect the detection results. The specific method is as follows: image 3 shown, including:

[0047] S101, adding a sample to be detected into the specific ligand-modified nano-metal particle solution, and measuring the ultraviolet-visible light absorption spectrum of the specific ligand-modified nano-metal particle.

[0048] In the above operation S101, after the sample to be detected containing arsenic ions is added, the specific ligand-modified nano metal particles are induced to aggregate by the arsenic ions. As described in Example 1, the fluorescence spectrum of the mixed quantum dots and the absorption spectrum of the specific ligand-modified metal n...

Embodiment 3

[0058] For the specific ligand-modified nano-metal particle solution mixed with the quantum dot solution in Example 1 and Example 2 to form a fluorescent inner filter effect sensor, this example takes dithiothreitol-modified gold nanoparticles as an example, The selection and optimization process of fluorescent inner filter effect sensor is introduced.

[0059] (1) Synthesis of gold nanoparticles with a diameter of 13nm

[0060] All the utensils were soaked in aqua regia for one night in advance, then washed with deionized water, repeated ultrasonication several times, and then dried for later use. The specific steps are: take 100mL aqueous solution of 1mM chloroauric acid, heat it to boiling under vigorous stirring, and quickly add 10mL trisodium citrate aqueous solution with a concentration of 38.8mM, the color of the solution gradually changes from light yellow to black purple Turned into wine red, the mixture continued to boil for 30 minutes, then turned off the heating f...

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Abstract

A method for detecting arsenic ions, comprising: S1, mixing a specific ligand-modified nano metal particle solution with a quantum dot solution; S2, adding a sample to be detected to the mixed solution; S3, detecting the fluorescence spectrum of the mixed solution after step S2 or The ultraviolet-visible light absorption spectrum of the nano-metal particles modified by the specific ligand; S4, the concentration of arsenic ions is obtained according to the fluorescence intensity of the fluorescence spectrum or the absorption intensity of the ultraviolet-visible light absorption spectrum. A method for detecting arsenic ions, comprising: S101, adding a sample to be detected into a solution of specific ligand-modified nano-metal particles, and measuring the ultraviolet-visible light absorption spectrum of the specific ligand-modified nano-metal particles; S102, adding a sample to the mixed solution After adding the quantum dot solution, detect the fluorescence spectrum of the mixture; S103, obtain the concentration of arsenic ions according to the absorption intensity of the ultraviolet-visible light absorption spectrum or the fluorescence intensity of the fluorescence spectrum. The method can improve the detection sensitivity and reduce the detection limit.

Description

technical field [0001] The invention relates to the technical field of analytical chemistry, in particular to an arsenic ion detection method. Background technique [0002] Arsenic is a toxic and widely distributed element, and trivalent arsenic is more toxic than pentavalent arsenic. Long-term exposure to arsenic in drinking water may increase the risk of cancer of the skin, lung, bladder and kidney, and These toxins are difficult to excrete from the body. [0003] The routine detection methods of the highly toxic heavy metal arsenic are mainly based on large-scale instruments and laboratory tests. The main detection methods include atomic absorption spectrometry, atomic emission spectrometry, inductively coupled plasma mass spectrometry, and electrochemical analysis. These traditional detection methods can achieve high-sensitivity and high-accuracy detection, but there are disadvantages such as expensive instruments, high operating costs, and complicated sample pretreatm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/31G01N21/64
Inventor 夏善红谢勇孙楫舟
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI
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