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Detection method of divalent heavy metal

A detection method and technology for heavy metals, applied in material excitation analysis, Raman scattering, etc., can solve the problems of lack of independent innovation technology and weak R&D strength, and achieve the effect of no marking and simple operation.

Inactive Publication Date: 2016-03-02
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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Problems solved by technology

[0005] In view of the lack of independent innovation technology for heavy metal detection in my country and the relatively weak research and development strength in the field of rapid on-site monitoring, this invention intends to develop a method for rapid determination of trace heavy metal ions in water: by visualizing the characteristics of nano-gold optical probes and gold nanoparticles Combined with the surface-enhanced Raman scattering (SERS) effect of nanoparticles, the sensitivity, selectivity and anti-interference ability of the matrix for heavy metal detection of nanoparticles are improved, and the determination of trace amounts of lead and cadmium heavy metal ions is realized.

Method used

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  • Detection method of divalent heavy metal
  • Detection method of divalent heavy metal
  • Detection method of divalent heavy metal

Examples

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Effect test

Embodiment 1

[0017] Example 1Pb 2+ Detection: Ultrapure water (945μL), chloroauric acid (8.0×10 -3 M, 30μL), dopamine (4.0×10 -3 M, 20 μL) and sodium hydroxide (0.1M, 5 μL) were mixed in a 1.5mL centrifuge tube, left to stand for 90min, and the product was centrifuged at 8000rpm for half an hour, and the concentrated sol was mixed with Pb 2+ After the solution to be tested was mixed at a volume ratio of 1:1, it was dropped on the surface of the silicon wafer, and detected by a portable Raman spectrometer with a laser wavelength of 785nm and a scanning time of 5 seconds.

Embodiment 2

[0018] Example 2Pb 2+ Detection: Ultrapure water (945μL), chloroauric acid (8.0×10 -3 M, 30μL), dopamine (4.0×10 -3 M, 20 μL) and sodium hydroxide (0.1M, 5 μL) were mixed in a 1.5mL centrifuge tube, left to stand for 90min, and the product was centrifuged at 8000rpm for half an hour, and the concentrated sol was mixed with Pb 2+ After the solution to be tested was mixed at a volume ratio of 1:1, the particle size and surface charge properties of the sol were detected (Table 1). The experimental results showed that the sol was agglomerated, which could provide more hot spots, and then realize the detection of Pb 2+ detection.

[0019] Table 1. Adding different concentrations of Pb 2+ Changes in the particle size and surface electrical properties of the gold sol after the solution to be tested.

[0020]

Embodiment 3

[0021] Example 3Cd 2+ Detection: Ultrapure water (850μL), chloroauric acid (8.0×10 -3 M, 100μL), dopamine (4.0×10 -3 M, 50μL) were mixed in a 1.5mL centrifuge tube, left to stand for 90min, and the product was centrifuged at 8000rpm for half an hour, and the concentrated sol was mixed with Cd 2+ After the solution to be tested was mixed at a volume ratio of 1:1, it was dropped on the surface of the silicon wafer, and detected by a portable Raman spectrometer with a laser wavelength of 785nm and a scanning time of 5 seconds.

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Abstract

The invention establishes a method of detecting Cd<2+> and Pb<2+> by a nanogold surface-enhanced Raman probe. The method includes using dopamine as a reducing agent in the preparation of nanogold and a SERS signal indicator, adjusting the ratio of chloroauric acid to dopamine in the preparation to obtain gold sols having different morphologies and particle sizes which are used for selective detection of Cd<2+> and Pb<2+>, adding the heavy metal ion to be measured into a detection system to form a heavy metal-gold sol-dopamine complex with the detection system, performing a qualitative detection of the heavy metal ion by means of observing the color change of the sol sample, and performing a quantitative determination of the heavy metal ion by means of observing the intensity change of SERS characteristic peak of dopamine molecule. The method has no need of mark, has simple operation, has a detection limit of [mu]g / L, and can satisfy the requirement of standard for domestic drinking water quality in our country.

Description

technical field [0001] The invention relates to the field of environmental monitoring, in particular to a method for detecting divalent heavy metals. technical background [0002] With the rapid development of my country's industry and the acceleration of urbanization, heavy non-ferrous metal ore mining, smelting, lead-containing batteries, leather and its products, chemical raw materials and chemical products, waste gas, waste water and solid waste are being used to varying degrees. Discharged into the environment, causing serious heavy metal pollution. Investigations and studies on the seven major water systems and major lakes in my country have shown that all kinds of heavy metal pollution are on the rise, seriously affecting the quality of water bodies. According to the continuous monitoring of 118 cities in China by relevant departments for 2-7 years, about 64% of the urban groundwater in China has been seriously polluted by heavy metals, 33% of the urban groundwater ha...

Claims

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Application Information

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IPC IPC(8): G01N21/65
Inventor 景传勇杜晶晶田中群
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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