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Chromium ion colorimetric detection probe and application method thereof

A technology for detecting probes and chromium ions, applied in the field of chromium ion colorimetric detection probes, can solve problems such as low sensitivity, and achieve the effects of high sensitivity, low detection limit and good selectivity

Inactive Publication Date: 2014-06-11
江苏广大瑞康农业发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a colorimetric detection probe for chromium ions, which solves the problems of low sensitivity and certain limitations of existing detection methods

Method used

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  • Chromium ion colorimetric detection probe and application method thereof
  • Chromium ion colorimetric detection probe and application method thereof
  • Chromium ion colorimetric detection probe and application method thereof

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Embodiment 1

[0036] Detection of Cr using 2,6-pyridinedicarboxylic acid functionalized gold nanoparticles as detection colorimetric probe 3+ When the colorimetric probe is added to the same amount of biological tissue or environmental sewage sample to be tested, observe its color change, when there is Cr 3+ When it exists, the gold nanoparticles functionalized with 2,6-pyridinedicarboxylic acid will change from the original red to purple or gray. At the same time, the ultraviolet spectrum test is carried out, and the surface plasmon characteristic absorption of the gold nanoparticles is observed from the ultraviolet spectrum. When the solution Cr 3+ When , the characteristic absorption peak of the solution is red-shifted, and when there is Cr in the solution 3+ When the concentration is very high, the gold nanoparticles agglomerate, and the color of the solution will change to purple or gray. The absorption peaks of gold nanoparticles functionalized with 2,6-pyridinedicarboxylic acid as ...

Embodiment 2

[0038] Detection of Cr in Environmental Sewage Using 2,6-Pyridinedicarboxylic Acid Functionalized Gold Nanoparticles as a Detection Colorimetric Probe 6+ When adding ascorbic acid to environmental sewage, the purpose is to remove Cr 6+ reduced to Cr 3+ , mix the obtained solution with the colorimetric probe in equal volume, and observe its color change. When the solution contains Cr 3+ At the same time, the color of the solution will change from red to purple. At the same time, the ultraviolet spectrum test shows that the characteristic absorption peak of the solution is red-shifted, and the gold nanoparticles are agglomerated. In order to judge whether there is Cr in the sample to be tested 6+ .

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Abstract

The invention discloses a chromium ion colorimetric detection probe, namely application of 2,6-dipicolinic acid functionalized gold nano-particles in detection of chromium ions. The chromium ions are Cr<3+> or Cr<6+>. The invention provides a method for preparing the 2,6-dipicolinic acid functionalized gold nano-particles of the claim 1. The method is characterized by comprising the following steps: adding 10mL of a 0.5mM chloroauric acid water solution into a bottle; rapidly adding 4mL of a 2.5*10<-3>M to 1.25*10<-3>M 2,6-dipicolinic acid water solution under violent stirring; agitating for two minutes and adding 1.2mL of a 0.01M NaBH4 solution; agitating a mixed solution to react for one hour until the color of the solution is changed into red from no color; and stopping agitating to obtain the solution, namely the 2,6-dipicolinic acid functionalized gold nano-particles. The chromium ion colorimetric detection probe has the beneficial effects of high sensitivity, good selectivity and low detection limit.

Description

technical field [0001] The invention belongs to the technical field of nanometer detection, and relates to a chromium ion colorimetric detection probe and an application method thereof. Background technique [0002] Heavy metal ions, especially mercury, chromium, lead, copper, etc., have significant biological toxicity. Heavy metal pollution refers to environmental pollution caused by heavy metals or their compounds. It is mainly caused by human factors such as mining, exhaust gas discharge, sewage irrigation and use of heavy metal products. Heavy metals that exist in various chemical states or chemical forms will persist, accumulate and migrate after entering the environment or ecosystem, causing harm. Among them, chromium is a common heavy metal in the environment, which is highly toxic and has serious adverse effects on human health. At present, chromium ion is one of the most serious pollutants in the leather industry. Chromium usually exists in two forms, namely Cr ...

Claims

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Application Information

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IPC IPC(8): G01N21/78B82Y40/00B82Y15/00
Inventor 柴芳杨馨代起君苏东悦夏清冬
Owner 江苏广大瑞康农业发展有限公司
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