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Method for detecting tervalent and hexavalent chromium ions simultaneously by use of gold nanoparticles

A technology of gold nanoparticles and hexavalent chromium ions, which is applied in material analysis by observing the effect on chemical indicators, and analysis by chemical reaction of materials, etc., can solve the problems of narrow detection range, poor selectivity, complicated operation, etc. problem, to achieve the effect of good selectivity and sensitivity, low cost and simple operation

Active Publication Date: 2014-08-13
THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Both ICP-MS and AAS methods require expensive instruments, and the operation is cumbersome, requiring specialized technicians to complete
[0006] Moreover, the detection range of most of the current existing technologies is relatively narrow. When the concentration of other ions is increased, the selectivity will become very poor, and it usually takes tens of minutes to several hours.

Method used

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  • Method for detecting tervalent and hexavalent chromium ions simultaneously by use of gold nanoparticles
  • Method for detecting tervalent and hexavalent chromium ions simultaneously by use of gold nanoparticles
  • Method for detecting tervalent and hexavalent chromium ions simultaneously by use of gold nanoparticles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Example 1. Synthesis of gold nanoparticles

[0042] The synthesis of gold nanoparticles adopts the classic preparation method of reducing chloroauric acid with sodium citrate.

[0043] 1) Dissolve 114 mg of sodium citrate in 10 ml of distilled water and heat to 100°C;

[0044] 2) At the same time, set up a reflux device, add 100 milliliters of distilled water to a 250 milliliter two-necked round-bottomed flask, add 41 milligrams of chloroauric acid, and heat it to 125 ° C to make it reflux;

[0045] 3) Quickly add the hot sodium citrate aqueous solution in 1) to 2), and stir vigorously at 1200 rpm for 15 minutes, the color of the solution gradually changes from light yellow to deep red;

[0046] 4) Remove the heating device and stir slowly to room temperature;

[0047] 5) Filter the obtained gold nanoparticle aqueous solution with a PES filter membrane (the pore size is 22 microns) to remove those inclusions or larger lumps.

[0048] 6) The synthesized gold nanoparti...

Embodiment 2

[0050] Example 2. Surface functionalization of gold nanoparticles

[0051] The surface functionalization of gold nanoparticles was performed by the classical ligand exchange method.

[0052] 10 microliters (10mM) of 2,3-dimercaptosuccinic acid were added to 1 milliliter of the above-mentioned gold nanoparticle aqueous solution (2nM), and the color of the solution was red and stirred slowly for two hours; (measured by a UV-Vis spectrophotometer) The absorbance of gold nanoparticle solution can calculate the molar concentration of gold nanoparticles according to Lambert Beer's law, and the molar absorption coefficient of gold nanoparticles with a size of 14 nanometers is 2.7×10 8 M- 1 cm -1 ).

Embodiment 3

[0053] Embodiment 3.pH value is to the influence research of this detection system

[0054] In the present invention, when the gold nanoparticle solution is acidic, the detection sensitivity is better. For chromium ion detection in an acidic environment, the concentration of hydrogen ions has a great influence. The higher the concentration of hydrogen ions, the lower the pH value, and the lower the concentration of chromium ions that can be detected. At pH 1.0-3.0, the lowest detection concentration that can be achieved is 10nM. As the pH value increases, the lowest The detection concentration also increases, and when the pH is above 5.0, the lowest detection concentration that can be achieved is about 1M. In order to achieve better sensitivity and system stability, the preferred pH value of the detection system is selected as 3.0.

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Abstract

The invention provides a method for detecting tervalent and hexavalent chromium ions by use of 2,3-dimercaptosuccinic acid modified gold nanoparticles. The gold nanoparticles are synthesized, the surface of the gold nanoparticle is modified with 2,3-dimercaptosuccinic acid by a ligand exchange method, the pH value of solution is adjusted to be in an acid stage, chromium ion containing solution is added, the color of the gold nanoparticle solution is changed and the color change can be observed by naked eyes, so as to judge whether the chromium ions exist, the detection limit is 10nM, and no interference of other metal ions is caused; besides, the 2,3-dimercaptosuccinic acid modified gold nanoparticles also can be combined with wireless devices such as a smartphone for detection on the spot.

Description

technical field [0001] The invention relates to a method for detecting trivalent and hexavalent chromium ions, in particular to a method for simultaneously detecting trivalent and hexavalent chromium ions by using gold nanoparticles. Background technique [0002] Chromium ions usually exist in the form of trivalent chromium ions and hexavalent chromium ions in the natural environment. Trivalent chromium ions are less toxic, while hexavalent chromium ions are very harmful to the human body and the environment. Interchangeable under certain conditions. The technologies currently used for chromium ion detection mainly include: [0003] Using small organic molecules. As CN103543115A discloses the method for detecting chromium ion concentration in the water body, described method adopts the following steps: (1) preparation of buffer solution; (2) preparation of chromogenic agent; (3) make standard solution curve, add 0.5mL phosphoric acid again solution, and 1mL of dibenzocarb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78
Inventor 蒋兴宇陈雯雯王卓曹丰晶
Owner THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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