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Method for visually and rapidly detecting chromium ions by using nanometer silver compound probe

A composite probe and nano-silver technology, which can be used in material analysis by observing the influence of chemical indicators, measurement of color/spectral characteristics, and analysis by making materials undergo chemical reactions can solve the problem of time-consuming and expensive equipment costs , expensive and other issues, to achieve the effect of simple determination method, low cost and rapid detection

Inactive Publication Date: 2013-06-19
UNIVERSITY OF CHINESE ACADEMY OF SCIENCES
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Problems solved by technology

These methods can realize the detection of chromium ions, but there are disadvantages such as cumbersome process, long time-consuming, low sensitivity, expensive instruments and high cost.

Method used

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  • Method for visually and rapidly detecting chromium ions by using nanometer silver compound probe
  • Method for visually and rapidly detecting chromium ions by using nanometer silver compound probe

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Embodiment Construction

[0017] 1. Use sodium acetate and acetic acid to prepare buffer solution, and use ultrapure water to prepare solutions such as silver nitrate, 4-mercaptobenzoic acid, 4-nitrothiophenol, ethylenediaminetetraacetic acid, and chromium ions. The solvent used was 0.01M acetic acid-sodium acetate buffer, pH 6.0. Sodium borohydride is added to the silver nitrate solution for reduction to generate nano-silver, and the color of the solution is bright yellow at this time.

[0018] 2. Add these two substances of 4-mercaptobenzoic acid and 4-nitrothiophenol in the synthesized nano-silver solution. The sulfhydryl groups on 4-mercaptobenzoic acid and 4-nitrobenzenethiol can be covalently bonded to the surface of nano-silver, and prepared into nano-silver composite probe after stirring for 0.5 hours. Add an equal volume of 0.01M acetic acid-sodium acetate buffer solution at pH 6.0, and the color of the solution is still bright yellow at this time.

[0019] 3. Add chromium ions to the prepar...

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Abstract

The invention relates to a method for visually and rapidly detecting chromium ions by using a nanometer silver compound probe, and particularly relates to a method for visually detecting chromium ions in a water solution by using nanometer silver modified by 4-sulfydryl benzoic acid and 4-nitrobenzene mercaptan. The method is mainly characterized in that the 4-nitrobenzene mercaptan and 4-sulfydryl benzoic acid are commonly modified on the surface of the nanometer silver to form a composite nanometer silver probe with two functional groups of nitro and carboxyl. The nanometer silver probe with double functional groups can be combined with chromium ions through complexing action, so that the nanometer silver is polymerized and the color is changed. According to the color change degree of the solution, the presence / absence and content of chromium ions in the solution can be judged by naked eyes. The detection method is simple and easy, low in cost and high in sensitivity, and is suitable for field fast detection of batch samples.

Description

technical field [0001] The invention relates to a method for visually and quickly detecting chromium ions with a nano-silver composite probe, specifically referring to the visual detection of chromium ions by using a nano-silver composite probe modified with 4-nitrobenzenethiol and 4-mercaptobenzoic acid through color changes. Background technique [0002] Heavy metal ion pollution has always been widely concerned. Chromium ions are one of the heavy metal ions. Excessive intake of chromium ions will cause certain harm to the human body, and even have the risk of carcinogenesis. Chromium is mainly used in metal processing, electroplating, tanning and other industries. In order to prevent the corrosion of equipment by circulating water in the industrial production process, chromate is often added. Therefore, the waste water and exhaust gas discharged from the industrial sector are anthropogenic sources of chromium in the environment. Chromium in industrial wastewater is main...

Claims

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Application Information

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IPC IPC(8): G01N21/25G01N21/31G01N21/35G01N21/78
Inventor 何裕建周影赵红苏晓鸥王培龙彭闻博袁龙飞蔡波太刘庆菊
Owner UNIVERSITY OF CHINESE ACADEMY OF SCIENCES
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