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A dual-channel fluorescent uranyl ion probe and its application

A technology of fluorescent uranyl ions and fluorescent probes, which is applied in the field of analysis and detection of trace radioactive elements using dual-channel fluorescent uranyl ion probes, can solve the problems of inaccurate measurement results and easy to be affected by the external environment, and achieve the goal of selecting Good performance, no interference, simple operation

Inactive Publication Date: 2020-07-10
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of these methods are based on the method of opening or closing. This detection method is easily affected by the external environment, resulting in inaccurate measurement results. However, the current method of using ratiometric fluorescence to detect uranyl ions is rarely reported.

Method used

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  • A dual-channel fluorescent uranyl ion probe and its application
  • A dual-channel fluorescent uranyl ion probe and its application
  • A dual-channel fluorescent uranyl ion probe and its application

Examples

Experimental program
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Effect test

Embodiment 1

[0022] 1) Synthesis of green fluorescent carbon quantum dots: 1.5 g of citric acid and 3 g of urea were dissolved in deionized water to form a precursor solution. The precursor solution was pyrolyzed at 200°C for 3 hours to obtain a black solid, which was dissolved in ultrapure water and dialyzed for later use.

[0023] 2) Preparation of red fluorescent cadmium telluride quantum dots

[0024] All glass instruments used in the synthesis process need to be soaked in aqua regia, washed with deionized water, and dried. 0.2284g cadmium chloride (CdCl 2 2.5H 2 O) Add to 250mL deoxygenated ultrapure water, then add 0.21mL mercaptopropionic acid, then adjust its pH value to 9 with 1M NaOH solution to form a solution containing mercapto compounds and cadmium ions. On the other hand, take 0.0319g of tellurium powder and 0.1g of sodium borohydride in 2mL of ultrapure water, and react in an ice bath for more than 8 hours under the protection of nitrogen. Inject 5mL of 0.5M dilute sulf...

Embodiment 2

[0029] 1) Synthesis of green fluorescent carbon quantum dots: 1.5 g of citric acid and 1.5 g of urea were dissolved in deionized water to form a precursor solution. The precursor solution was pyrolyzed at 180°C for 4 hours to obtain a black solid, which was dissolved in ultrapure water and dialyzed for later use.

[0030] 2) Preparation of red fluorescent cadmium telluride quantum dots

[0031] All glass instruments used in the synthesis process need to be soaked in aqua regia, washed with deionized water, and dried. 0.2284g cadmium chloride (CdCl 2 2.5H 2 O) Add to 250mL deoxygenated ultrapure water, then add 0.21mL mercaptopropionic acid, then adjust its pH value to 10 with 1M NaOH solution to form a solution containing mercapto compounds and cadmium ions. On the other hand, take 0.0319g of tellurium powder and 0.15g of sodium borohydride in 2mL of ultrapure water, under the protection of nitrogen, react in an ice bath for more than 8 hours. Inject 5mL of 0.5M dilute sul...

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Abstract

The invention belongs to the field of analysis methods of radioactive elements, and particularly relates to a method for analyzing and detecting trace radioactive elements by a double-channel fluorescent uranyl ion probe. The probe is established on the basis of a semiconductor quantum dot-carbon quantum dot double-channel fluorescent signal with a method mainly comprising the following steps: (1)synthesizing a green fluorescent carbon quantum dot; (2) synthesizing a red fluorescent cadmium quantum dot; (3) preparing the probe. The detection principle is that uranyl ions can quench fluorescence of the red quantum dot, while the green fluorescence signal of the carbon quantum dot remains stable and unchanged, and quantitative detection of a to-be-detected sample is realized by testing thelinear relationship between concentration of the sample and the ratio of the red fluorescence signal to the green fluorescence signal. With adoption of the method, use of large-scale instruments can be avoided to a certain extent, all that is required is only one hand-held ultraviolet lamp for visual detection, operation is simple, convenient and quick, the pretreatment process is omitted, and high-sensitivity selective detection of the trace uranyl ions in a solution can be realized.

Description

technical field [0001] The invention belongs to the field of analysis methods of radioactive elements, and in particular relates to a method for analyzing and detecting trace radioactive elements by using a dual-channel fluorescent uranyl ion probe. Background technique [0002] With the continuous development of society, the problem of energy shortage has gradually become the focus of today's society, and nuclear fuel, as a new type of fuel, has gradually entered people's daily life. Uranium is one of the main elements of nuclear fuel, and a large number of uranium mining inevitably brings uranium pollution. The radioactivity and chemical toxicity of uranium can induce various diseases and cause irreversible damage to bones, kidneys and circulatory system. As the most stable form of uranium in solution and in the human body, uranyl is in urgent need of a rapid and accurate quantitative detection method. [0003] In recent years, fluorescence detection has attracted much a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/88C09K11/65B82Y20/00B82Y30/00B82Y40/00G01N21/64
CPCB82Y20/00B82Y30/00B82Y40/00C09K11/65C09K11/883G01N21/64G01N21/6428G01N21/643G01N2021/6417G01N2021/6432
Inventor 王素华陈欣峰张奎余欢岳季殷冉皓
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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