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Detecting method for lead ions

A detection method and technology for lead ions are applied in the fields of nanomaterials and analytical chemistry to achieve accurate and reliable results, high stability and low cost.

Active Publication Date: 2018-11-16
JIANGNAN UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In general, the selectivity and stability of the above methods need to be further improved

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  • Detecting method for lead ions
  • Detecting method for lead ions
  • Detecting method for lead ions

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preparation example Construction

[0037] The gold-core-platinum-shell nanoparticles can be prepared by methods known in the industry. For example, in some preferred embodiments, the preparation method of the gold core platinum shell nanoparticles includes:

[0038] 1) Mix ultrapure water and HAuCl 4 After the solution is mixed, heat to boiling, then add sodium citrate solution, and keep heating until the color of the mixed reaction solution turns wine red, then continue heating, and then cool to room temperature;

[0039] 2) with step 1) the dispersion liquid of the gold nanoparticles obtained with K 2 PtCl 6 Mix and heat to 70-90° C., then add a mixture of ultrapure water and L-ascorbic acid in batches, and keep heating to obtain a dispersion of gold-core platinum-shell nanoparticles.

[0040] see figure 1 Shown is the schematic diagram of the lead ion detection method based on gold core platinum shell nanoparticles in a comparatively typical embodiment of the present invention, and it comprises: 2 o 3 ...

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Abstract

The invention discloses a detecting method for lead ions. The detecting method comprises the following steps: mixing a to-be-detected solution containing S2O3<2-> and Pb<2+> with dispersion liquid ofgolden core platinum shell nanoparticles; then adding a developing solution, then determining a light absorption value of an obtained mixed reaction system at ultraviolet-visible light spectrum, and realizing the detection of the Pb<2+> in the to-be-detected solution. According to the detecting method for the lead ions, provided by the invention, colorimetric detection of Pb<2+> can be realized, linear range is 50nmol / L to 2.0mu mol / L and the sensitivity can reach 6.7nmol / L; the detecting method has the advantages of simplicity, quickness, low cost, high stability and the like, and can well meet the demand of actual application.

Description

technical field [0001] The invention relates to the technical fields of nanomaterials and analytical chemistry, in particular to a colorimetric detection method for lead ions based on gold-core platinum-shell nanoparticles, which can be used for the detection of lead ions in tap water. Background technique [0002] Pb 2+ Exposure to harmful substances can affect human health, especially to the immature nervous system of children. When the blood lead concentration exceeds 100 μg / L, it will seriously affect the brain function of children, resulting in low intelligence and behavioral development problems. World Health Organization (WHO) recommends Pb in drinking water 2+ The maximum limit is 10μg / L. At present, many common physical and chemical detection methods are applied to the detection of Pb2+, such as atomic absorption method, X-ray fluorescence spectrometry, inductively coupled plasma mass spectrometry (ICP-MS), etc., but these methods require more expensive instrumen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/33G01N21/78
CPCG01N21/33G01N21/78
Inventor 钱志娟彭池方郑蓉施美荣
Owner JIANGNAN UNIV
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