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A method for rapid detection of trace mercury ions

A mercury ion, trace technology, applied in the field of detection, can solve the problems of high instrument requirements, complicated process, complicated steps, etc., and achieve the effect of meeting field requirements, high detection sensitivity, and simple operation

Inactive Publication Date: 2019-11-08
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example: spectral detection method and electrochemical detection method mainly use spectrometer or electrochemical workstation to measure the response signal. This method has high requirements for instruments, and high-cost precision instruments cannot meet the requirements of the field environment; special instruments or test paper methods need to be specially produced. The material and the process are more complicated, and it is difficult to guarantee the detection effect in the laboratory environment in large-scale industrial production; The specific response of the reagent to mercury ions achieves the detection effect, and the relevant reagents are easy to carry and use on-site. However, in the method reported so far, the preparation process of gold nanomaterials and the addition of the coating agent for detection are completed in two steps. That is, firstly, under the condition of a certain coating agent, the reducing agent is used to reduce chloroauric acid to prepare gold nanomaterials, and then add detection and response molecules to coat the surface of gold nanomaterials. The steps are more complicated and the types of medicines required are increased. This further increases the uncertainty of detection

Method used

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  • A method for rapid detection of trace mercury ions
  • A method for rapid detection of trace mercury ions
  • A method for rapid detection of trace mercury ions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] step 1)

[0036] a. Prepare oxyethylene-based steroid BPS-20 and BPS-30 in a molar ratio of 1:1 to make a deionized mixed aqueous solution with a total molar concentration of 200mmol / L; b. Prepare 10mmol / L of chloroauric acid HAuCl 4 Deionized aqueous solution; c. Add 3 mL of the mixed aqueous solution of step a and 0.6 mL of the aqueous solution of step b into 2.4 mL of deionized water, mix well and let stand for 1 hour, centrifuge and wash with deionized water until no reactive reagent remains, and obtain gold nanoparticles D. adding the prepared gold nanoparticles into 2.5mL deionized water to obtain the gold nanoparticle hydrosol; e. carrying out the ultraviolet spectrum detection and characterization of the prepared gold nanoparticle hydrosol, such as image 3 shown.

[0037] step (2)

[0038] Ⅰ. Configure ionic water solution, including mercuric chloride HgCl 2 , Sodium Chloride NaCl, Potassium Chloride KCl, Magnesium Chloride MgCl 2 , calcium chloride CaCl 2...

Embodiment 2

[0043] Embodiment 2 is basically the same as the steps of Example 1, except that in II of step (2), the concentration of mercury ions is 1 μmol / L, and the concentration of other metal ions is 10 μmol / L, and the detection comparison results are as follows: Figure 5 As shown, it can be seen that when the concentration of mercury ions increases, the absorption peak of gold nanoparticles decreases more obviously, while other ions (including chloride ions in mercuric chloride) appear, the absorption peak of gold nanoparticles does not change.

Embodiment 3

[0045] Embodiment 3 and embodiment 1 steps are basically the same, just in the II of step (2), mercury ion concentration is 10 μ mol / L, and the concentration of other metal ions is 10 μ mol / L, and detection comparison result is as follows Image 6 As shown, it can be seen that when the concentration of mercury ions is further increased, the absorption peak of gold nanoparticles basically disappears, and when other ions (including chloride ions in mercuric chloride) appear, the absorption peak of gold nanoparticles does not change.

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Abstract

The invention specifically relates to a method for rapidly detecting trace mercury ions, belonging to the field of detection methods. The method comprises the following steps: preparing a gold nanoparticle hydrosol and performing detection characterization; mixing the gold nanoparticle hydrosol with an aqueous ion solution; and detecting whether the aqueous ion solution contains mercury ions. Themethod of the invention is simple and prepares the gold nanoparticle hydrosol by reacting oxyvinyl sterols BPS-20 and BPS-30 with chloroauric acid HAuCl4; in cooperation with ultraviolet spectroscopyor TEM or through observation with naked eyes, the hydrosol can rapidly detect mercury ions in aqueous solutions; and the method has minimum mercury ion detection concentration of 0.1 [mu]mol / L, is sensitive and effective, is easy to carry and use, and has potential market value.

Description

technical field [0001] The invention relates to the field of detection methods, in particular to a method for rapidly detecting trace amounts of mercury ions. Background technique [0002] Mercury pollution refers to environmental pollution caused by mercury or mercury-containing compounds. my country is the country with the largest mercury consumption and emissions in the world. Wastewater discharged from industries such as chlor-alkali, plastics, batteries, and electronics, as well as waste medical equipment, will cause mercury pollution. The biological toxicity of mercury is extremely strong. It is difficult to be excreted after entering the organism, which seriously threatens human health. The toxicity of various mercury compounds varies greatly. Inorganic mercury in water is highly toxic and is easily absorbed by the human body through the gastrointestinal tract. The harm mainly manifests as damage to the digestive tract, and further manifests as damage to the liver, ki...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/33G01N21/78G01N23/04G01N23/20
CPCG01N21/33G01N21/78G01N23/04
Inventor 贾寒吴红燕周洪涛
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)