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Heavy metal mercury ion detection method

A detection method and heavy metal technology, applied in the field of heavy metal mercury ion detection, can solve the problems of poor stability of DNA molecules, weak resistance to environmental matrix interference, etc.

Inactive Publication Date: 2016-07-06
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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Problems solved by technology

The DNA labeling method can realize the trace detection of mercury ions, but the stability of the DNA molecule is poor, and the ability to resist the interference of the environmental matrix is ​​weak

Method used

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Examples

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Embodiment 1

[0021] Example 1Fe 3 o 4 Preparation of nanoparticles: 0.65g FeCl 3 ·6H 2 O, 0.118g sodium citrate, 1.2g sodium acetate mixed with 20mL ethylene glycol and magnetically stirred for 0.5h, put into a polytetrafluoroethylene reactor at 200°C for 10h, cooled to room temperature after heating, washed with ethanol for 3 times, deionized Wash 3 times with water, dry in a vacuum oven at 50°C for 2 hours to obtain Fe 3 o 4 Magnetic nanoparticles; Fe 3 o 4 / SiO 2 Preparation of magnetic particles: Take 0.1g nano-Fe 3 o 4 Disperse in 20mL nitric acid solution (0.1mol / L), sonicate for 10min, wash 6 times with deionized water, disperse in the mixed solution (20mL ethanol + 4mL deionized water + 1mL ammonia water), sonicate for 10min, pour into three round bottoms In the flask, 0.8mLTEOS was continuously added dropwise under mechanical stirring. After the reaction was carried out for 3h, the resulting precipitate was dried at 60°C for 1h to obtain Fe 3 o 4 / SiO 2 nanoparticles. ...

Embodiment 2

[0022] Example 2 Selective Detection of Probe Molecular Modification The preparation method of the SERS substrate is the same as that in Example 1. Hg in complex matrix solution 2+ Enrichment and detection: Disperse 0.2mg polyelectrolyte-modified magnetic nanoparticles in 1mL containing Hg 2+ In the complex matrix solution, the concentration in the solution is 1x10 -5 mol / L. After 1 h, the magnetic particles were collected with an external magnetic field, and the magnetic particles enriched with heavy metals were placed on a silicon wafer, and the signal was collected by a portable Raman spectrometer with a scanning time of 5 s to obtain the SERS spectrum of the heavy metal mixture.

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Abstract

The invention relates to an analysis method for selectively detecting mercury ions by means of magnetic materials and belongs to the field of environment analysis. Fe3O4 / SiO2 / Au magnetic particles are synthesized, and selective enrichment and detection of mercury ions are achieved by means of the method that the surfaces of the magnetic particles are modified with Raman markers. A series of experiments prove that a preparation method and the analysis method which are adopted are easy to operate, and selective detection of the mercury ions can be achieved.

Description

technical field [0001] The invention relates to an analysis method for selectively detecting mercury ions by using a magnetic material. technical background [0002] Environmental pollution is becoming more and more serious with the development of modern industry, and heavy metal pollution is an important aspect of environmental pollution, which poses a serious threat to human health. Therefore, the analysis and monitoring of heavy metal content in water and other media is of great significance to protect the environment and improve the quality of human life. At present, the commonly used heavy metal detection methods include atomic absorption spectrometry, inductively coupled plasma atomic emission spectrometry, and electrochemical methods. The instruments used in these methods are expensive and require high sample pretreatment. Therefore, exploring simple, economical, fast and efficient heavy metal detection methods has become one of the important research directions in ...

Claims

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Application Information

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IPC IPC(8): G01N21/65G01N1/40
CPCG01N21/658G01N1/4077
Inventor 景传勇孙振丽田中群
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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