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Method for Trace Detection of Mercury Ions

A mercury ion and trace technology, applied in the field of detection, can solve the problems of weak anti-interference ability, inability to detect mercury ions, and many chemicals, and achieve the effect of simple detection method, good consistency and repeatability

Active Publication Date: 2020-09-25
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this construction method can be used to detect mercury ions in water, it also has shortcomings. First, it involves a variety of chemicals, and the construction process is complicated and time-consuming, so it cannot detect mercury ions in real time; secondly, due to organic The weak physical and chemical stability of the substance leads to poor stability and weak anti-interference ability of the SERS detection it participates in

Method used

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  • Method for Trace Detection of Mercury Ions
  • Method for Trace Detection of Mercury Ions
  • Method for Trace Detection of Mercury Ions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The specific steps for trace detection of mercury ions are:

[0027] Step 1, first place the gold nanoparticles coated with copper sulfide shells in mercury ion solution and soak for 5 minutes; wherein, the particle diameter of gold nanoparticles is 10nm, and the shell thickness of the copper sulfide shells coated outside 0.6nm. Then it is subjected to solid-liquid separation treatment; wherein, the solid-liquid separation treatment is centrifugation (or filtration separation), the rotating speed of centrifugation is 3000r / min, and the time is 7min to obtain the product.

[0028] Step 2, using the product as an active substrate for surface-enhanced Raman scattering, and using a laser Raman spectrometer to measure the reaction-enriched mercury on it; wherein, the excitation wavelength of the laser Raman spectrometer is 532nm, and the output power is 0.1mW / μm 2 , the integration time is 20s, and the obtained image 3 , Figure 4 The detection results are shown in the c...

Embodiment 2

[0030] The specific steps for trace detection of mercury ions are:

[0031] Step 1, first place the gold nanoparticles coated with the copper sulfide shell layer in the mercury ion solution and soak for 35min; wherein the particle diameter of the gold nanoparticles is 58nm, and the shell thickness of the copper sulfide shell layer coated outside 6nm. Then it is subjected to solid-liquid separation treatment; wherein, the solid-liquid separation treatment is centrifugation (or filtration separation), the rotating speed of centrifugation is 4000r / min, and the time is 6min to obtain the product.

[0032] Step 2, using the product as an active substrate for surface-enhanced Raman scattering, and using a laser Raman spectrometer to measure the reaction-enriched mercury on it; wherein, the excitation wavelength of the laser Raman spectrometer is 532nm, and the output power is 1mW / μm 2 , the integration time is 15s, and the obtained image 3 , Figure 4 The detection results are s...

Embodiment 3

[0034] The specific steps for trace detection of mercury ions are:

[0035] Step 1, first place the gold nanoparticles covered with copper sulfide shells in mercury ion solution and soak for 63min; 12nm. Then it is subjected to solid-liquid separation treatment; wherein, the solid-liquid separation treatment is centrifugation (or filtration separation), the rotating speed of centrifugation is 5000r / min, and the time is 5min to obtain the product.

[0036] Step 2, using the product as an active substrate for surface-enhanced Raman scattering, and using a laser Raman spectrometer to measure the reaction-enriched mercury on it; wherein, the excitation wavelength of the laser Raman spectrometer is 532nm, and the output power is 9mW / μm 2 , the integration time is 10s, and the obtained image 3 , Figure 4 The detection results are shown in the curves in .

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Abstract

The invention discloses a method for trace detection of mercury ions. The method utilizes a surface-enhanced Raman scattering method and comprises immersing copper sulfide shell-coated gold nanoparticles in a mercury ion solution for at least 5min, carrying out solid-liquid separation treatment to obtain a product, and measuring reaction-enriched mercury on the product as a surface-enhanced Ramanscattering active substrate through a laser Raman spectrometer, wherein the gold nanoparticles have sizes of 10-200nm, the copper sulfide shell has thickness of 0.6-25nm, the immersion time is in a range of 5-120min, the solid-liquid separation treatment is centrifugal separation or filtering separation, a rotation rate is 3000-7000r / min in the centrifugal separation, the centrifugal separation time is 3-7min, the excitation wavelength of the laser Raman spectrometer is 532nm or 633nm or 785nm, the output power is 0.1-25mW / micron<2> and the integration time is 1-20s. The method can be widely and commercially used for real-time trace detection of mercury ions in water.

Description

technical field [0001] The invention relates to a detection method, in particular to a method for trace detection of mercury ions. Background technique [0002] Mercury and its compounds are highly toxic pollutants. Mercury is not biodegradable like organic pollutants, but tends to accumulate in organisms, spread along the food chain, and eventually accumulate in human bodies. And cause many diseases, such as the Minamata disease that happened in Japan. Mercury in common water exists in the form of divalent mercury ions, so it is very necessary to detect mercury ions in trace amounts. At present, people have made unremitting efforts to detect mercury ions, such as a method for measuring Hg released on July 30, 2014 in the Chinese invention patent application CN 103954607A 2+ Construction method of ultrasensitive surface-enhanced Raman spectroscopy sensor. The construction method described in the invention patent application is to modify the double-stranded DNA composed of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/65
CPCG01N21/658
Inventor 鲍皓明张洪文蔡伟平
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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