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Rapid mercury detection method based on self-assembly of gold nanorods

A gold nanorod and self-assembly technology, applied in the field of mercury detection, can solve the problems of rapid detection and long analysis period of samples in difficult environments, and achieve the effects of easy popularization, good reproducibility, and simple operation

Inactive Publication Date: 2011-11-23
HUNAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although these methods have high sensitivity and accuracy, they require large and expensive instruments, long analysis cycles, complex sample pretreatment processes, and relatively high requirements for operators, which make them difficult to apply to environmental samples. on-site rapid detection
In addition, some new mercury ion detection methods have also been developed in recent years. Compared with traditional methods, these methods have the advantages of simplicity, economy, speed and high sensitivity, but have the disadvantage of limited selectivity.

Method used

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  • Rapid mercury detection method based on self-assembly of gold nanorods
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  • Rapid mercury detection method based on self-assembly of gold nanorods

Examples

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Embodiment 1

[0024] First, get the gold nanorod solution of 3mL namely the dispersion system of gold nanorod, wherein, the concentration of surfactant hexadecyltrimethylammonium bromide is 10 －3 mol / L. The surface plasmon resonance spectrum of its gold nanorods is shown in figure 2 shown. Then, 0.1mL sodium phosphate solution (concentration is 0.1 mol / L) was added to the gold nanorod dispersion system, and at the same time, the visible-near-infrared absorption spectrum was used to monitor. domain surface plasmon resonance spectrum figure 2 shown. TEM image of self-assembled chain of gold nanorods figure 1 shown. When the surface plasmon spectrum curve is stable for 30 minutes, add 0.03 mL of sodium borohydride solution (concentration is 0.001 mol / L), and after 2 minutes, add mercury ion concentration of 10 ?? -5 mol / L, 10 ?? -8 mol / L, 10 ?? -9 mol / L of inorganic mercury (HgCl 2 ) samples were monitored by visible-near-infrared absorption spectroscopy, and the surface plasm...

Embodiment 2

[0026] First, get 3mL of gold nanorod solution, i.e. the dispersion system of gold nanorods, wherein the concentration of surfactant cetyltrimethylammonium bromide is 10 －3 mol / L. The surface plasmon resonance spectrum of its gold nanorods is shown in figure 2 shown. Then, 0.1mL sodium phosphate solution (concentration is 0.1 mol / L) was added to the gold nanorod dispersion system, and at the same time, the visible-near-infrared absorption spectrum was used to monitor. domain surface plasmon resonance spectrum figure 2 shown. TEM image of self-assembled chain of gold nanorods figure 1 shown. When the surface plasmon spectrum curve is stable for 30 minutes, add 0.03mL of sodium borohydride solution (concentration is 0.001 mol / L), and then add organic mercury (methylmercury) sample after 2 minutes, and use visible-near infrared absorption spectrum When monitored, its surface plasmon resonance wavelength undergoes a significant blue shift (decrease), such as Figure 5 sho...

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Abstract

The invention discloses a rapid mercury detection method based on self-assembly of gold nanorods. The method of the invention mainly comprises the following steps: a nanorod self-assembly chain with substantially enlarged surface plasma resonance signals is formed through inducing the gold nanorods by phosphates; and a mercuric compound (the mercuric compound comprises inorganic mercuric ions andorganic mercury) is reduced to elemental mercury by a strong reductant sodium borohydride to change properties of surface plasmas of the gold nanorods, and the surface plasma signals are enlarged by the nanorod self-assembly chain. So the sensitive and rapid mercury detection method is established. The method of the present invention has the advantages of simple operation, good reappearance, and easy popularization.

Description

technical field [0001] The invention belongs to a method for detecting mercury, in particular to a method for sensitively and quickly detecting mercury based on gold nanorod self-assembly induced by phosphate to amplify surface plasmon resonance signals. Background technique [0002] Mercury is an important metal element that exists in nature. Because of its unique properties, mercury and its compounds are widely used in industrial and agricultural production. However, mercury is a chemical substance with severe physiological toxicity, even if its concentration is very low, it is also a toxic and harmful environmental pollutant. Due to its persistence, easy migration and high bioaccumulation, mercury has become one of the most concerned environmental pollutants. The development of methods and materials for detection and removal of mercury is an important means to detect and control pollution. Therefore, it is urgent to find a fast, simple and highly sensitive method to de...

Claims

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Application Information

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IPC IPC(8): G01N21/55G01N21/552
Inventor 黄昊文屈彩婷易守军许中坚廖博
Owner HUNAN UNIV OF SCI & TECH
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