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Mercury-ion nanometer sensor and preparing method and application thereof

An ion sensor and mercury ion technology are applied in the field of mercury ion nanosensors and their preparation, achieving the effects of high sensitivity, wide application prospects, and omitting sample pretreatment steps.

Active Publication Date: 2017-04-26
RENMIN UNIVERSITY OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, this immobilized quantum dot heavy metal sensing technology is still blank at home and abroad.

Method used

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  • Mercury-ion nanometer sensor and preparing method and application thereof
  • Mercury-ion nanometer sensor and preparing method and application thereof
  • Mercury-ion nanometer sensor and preparing method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Embodiment 1, preparation ion sensor

[0037] 1) Remove about 2.5 cm of the coating layer from a silica optical fiber with a diameter of 600 μm and a length of 5 cm, soak the part where the coating layer was removed in 30% hydrofluoric acid, and take out the optical fiber when the diameter is reduced to about 230 μm, At this time, a cone-shaped structure is formed, and the length of the cone angle is about 0.5 cm. The tapered optical fiber can ensure that the fluorescence propagates in the form of total reflection in the optical fiber, thereby improving the transmission efficiency of the fluorescence.

[0038] 2) Hydroxylation of optical fiber: immerse the tapered optical fiber to 30% H 2 o 2 / Concentrated H 2 SO 4 (v / v, 3:1) mixed solution, take out the optical fiber after 30 minutes at room temperature, and fully rinse with ultrapure water until the pH of the cleaning solution is neutral, and finally dry it with nitrogen at room temperature, and store it in a vac...

Embodiment 2

[0042]Embodiment 2, utilizing the ion sensor obtained in embodiment 1 to detect the spiked water sample of mercury ions

[0043] 1) the ion sensor prepared in embodiment 1 is installed on figure 2 In the sensing platform shown, the tapered end of the optical fiber extends into the sample channel, and the other end is connected to the excitation light transmission device and the fluorescence collection device through a fiber optic coupler to collect the fluorescence signal generated by the detection end and convert it into an electrical signal. signal output;

[0044] 2) Inject 200 μl of a series of mercury ion standard solutions with a concentration in the range of 5 to 1000 nM into the sample channel sequentially, and the mercury ions entering the channel will interact with the quantum dots on the surface of the optical fiber, causing the fluorescence intensity to change. After each sample is measured, follow step 1) to replace the optical fiber.

[0045] The real-time sig...

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Abstract

The invention discloses a mercury-ion nanometer sensor and a preparing method and application thereof. The mercury-ion nanometer sensor is composed of an optical fiber and carboxylation quantum dots, wherein the surface of one end of the optical fiber is coated with the carboxylation quantum dots. In the mercury-ion nanometer sensor, the optical fiber is a quartz optical fiber; the optical fiber coated with the carboxylation quantum dots is conical. The carboxylation quantum dots are CdSe / ZnS shell-type quantum dots, wherein carboxyl is modified on the surfaces of the carboxylation quantum dots; the maximum emission wavelength of the carboxylation quantum dots is 605 nm. According to the mercury-ion nanometer sensor and the preparing method and application thereof, the particle aggregation problem caused by the conditions such as pH and the ion strength is solved, the multiple sample pretreatment steps are omitted, and the mercury-ion nanometer sensor also has the higher signal response speed. In addition, the method has the high sensitivity (a detection limit is the nM magnitude order), the requirements of mercury control indexes in various water quality standards can be met, and therefore the preparing method has the broad application prospects.

Description

technical field [0001] The invention belongs to the field of component detection, and in particular relates to a mercury ion nanometer sensor and its preparation method and application. Background technique [0002] Mercury is a highly toxic heavy metal widely distributed in nature, even at a low concentration level, it will cause serious harm to human health. In order to reduce the harm of mercury to the public, the U.S. Environmental Protection Agency and my country have set nM mandatory standards for mercury content in drinking water. Therefore, the detection method of mercury ions must have high sensitivity. At present, the quantitative detection techniques widely used in the world include: atomic absorption method (AAS), inductively coupled plasma atomic emission spectrometry (ICP-AES), inductively coupled plasma mass spectrometry (ICP-MS), etc. Although these methods have high sensitivity and precision, they often require complex and expensive instruments, profession...

Claims

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Application Information

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IPC IPC(8): G01N21/64G01N33/18
CPCG01N21/643G01N33/1813
Inventor 龙峰王宏亮吴君
Owner RENMIN UNIVERSITY OF CHINA
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