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Method for detecting trace Hg < 2 + > by using fluorescence sensor

A fluorescence sensor and trace technology, applied in the field of fluorescence sensors, can solve the problems of insufficient sensitivity, cumbersome pretreatment process, long analysis period, etc., and achieve the effects of good reproducibility, high sensitivity and simple operation.

Pending Publication Date: 2021-09-07
ANALYSIS & TESTING CENT CHINESE ACADEMY OF TROPICAL AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, UV spectrophotometry is not sensitive enough to meet the requirements of trace analysis
However, atomic absorption spectrometry and atomic emission spectrometry require cumbersome pretreatment processes and a long analysis cycle, which cannot achieve rapid analysis.

Method used

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  • Method for detecting trace Hg &lt; 2 + &gt; by using fluorescence sensor
  • Method for detecting trace Hg &lt; 2 + &gt; by using fluorescence sensor
  • Method for detecting trace Hg &lt; 2 + &gt; by using fluorescence sensor

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0030] An embodiment of the present invention provides a method for detecting trace amounts of Hg2+ by a fluorescent sensor, comprising the following steps:

[0031] Water sample treatment, synthesis of water-soluble Au@GQDs, sample detection, preparation of working curves, and result analysis.

[0032] The steps of the water sample treatment are: take 50 mL of water sample, the water sample is one of river water, tap water and surface water, choose river water in this embodiment, boil to remove the foam layer on the surface; wait for the water sample to cool to room temperature, put It is filtered with qualitative filter paper; the processed sample thus obtained.

[0033] The steps for synthesizing water-soluble Au@GQDs are as follows: Weigh 1.5g of citric acid and 1.0g of ethylenediamine and fully dissolve them in 10mL of deionized water, transfer them to a reaction kettle and heat to 200°C for 30min. After the reaction, The solution was transferred to a three-necked flask;...

Embodiment 2

[0037] The preparation method of this example is the same as that of Example 1, but some data are different. The difference is that the pH value of the BS buffer solution in this example is 7.4.

Embodiment 3

[0039] The preparation method of this example is the same as that of Example 1, but some data are different. The difference is that the pH value of the BS buffer solution in this example is 7.6.

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PUM

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Abstract

The invention is applicable to the technical field of fluorescence sensors, and provides a method for detecting trace Hg < 2 + > by using a fluorescence sensor, which comprises the following steps: water sample treatment, synthesis of water-soluble Au-coated GQDs, sample detection, preparation of a working curve, and result analyzing. According to the embodiment of the invention, a novel Au (at) GQDs quantum dot nanometer material is synthesized by adopting a hydrothermal method, the Au (at) GQDs quantum dot nanometer material is used as a fluorescent quantum dot probe, a novel method for measuring trace Hg < 2 + > is established by utilizing the fluorescence quenching effect of Hg < 2 + > on Au (at) GQDs, and the method is applied to detection of Hg < 2 + > in an actual sample to obtain a satisfactory result. The method is simple and rapid to operate, high in sensitivity and good in reproducibility. The problems that an existing Hg < 2 + > detection method is insufficient in sensitivity, the pretreatment process is poor, and the analyzing period is long are solved.

Description

technical field [0001] The invention belongs to the technical field of fluorescent sensors, in particular to a fluorescent sensor for detecting trace Hg 2+ Methods. Background technique [0002] Hg 2+ It is a common toxic pollutant of heavy metal ions. Industrial waste gas, waste water, waste residue, chemical fertilizers, pesticides, urban sewage, etc. are Hg 2+ major source of pollution. Hg 2+ Difficult to be removed by biodegradation, Hg 2+ Accumulation in water, soil and food environment may cause mercury poisoning, and then damage the central nervous system and organs, posing a serious threat to human health. Therefore, for trace Hg in environmental samples 2+ It is of great significance to carry out detection and monitoring. Currently, the detection of Hg 2+ The methods mainly include ultraviolet spectrophotometry, atomic absorption spectrometry, atomic emission spectrometry and so on. However, UV spectrophotometry is not sensitive enough to meet the requireme...

Claims

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Application Information

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IPC IPC(8): G01N21/64
CPCG01N21/643G01N2021/6432Y02A20/20
Inventor 黎舒怀庞朝海马雄辉王明月张群
Owner ANALYSIS & TESTING CENT CHINESE ACADEMY OF TROPICAL AGRI SCI