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Ultra-sensitive mercury pollution colorimetric detection method based on copper sulfide nano material

The technology of a nanomaterial and a detection method is applied in the field of ultra-sensitive mercury pollution colorimetric detection, which can solve the problems of low mercury ion content and many detection interference factors, and achieve the effects of low cost, good anti-interference and good selectivity.

Inactive Publication Date: 2021-04-27
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Claims
  • Application Information

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Problems solved by technology

Although some progress has been made in the design of mercury ion micro-nano colorimetric sensors and their application in the detection of mercury ions in water, due to the low content of mercury ions in some environmental, food and biological samples and many detection interference factors, Ultrasensitive detection of mercury contamination in complex sample matrices is still the focus and difficulty of mercury ion micro-nanosensor research

Method used

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  • Ultra-sensitive mercury pollution colorimetric detection method based on copper sulfide nano material
  • Ultra-sensitive mercury pollution colorimetric detection method based on copper sulfide nano material
  • Ultra-sensitive mercury pollution colorimetric detection method based on copper sulfide nano material

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Embodiment 1

[0031] Add 100ng CuS nanoparticles (average particle size 5nm) to 0.5mL sample solution containing different concentrations (0-3ppm) of mercury ions, add 50μL o-phenylenediamine (10mmol / L) and 5μL Hydrogen peroxide solution (30%). After the color reaction was carried out for 30 min, the absorbance signal of each solution was recorded and plotted using a UV-Vis spectrophotometer. Such as image 3 As shown, as the mercury ion concentration increases, the absorbance difference of the sample also gradually increases. When the mercury ion concentration exceeds 1ppm, the absorbance difference of the sample tends to be stable. The experiment proves that the method can quantitatively detect the mercury ion concentration in the sample.

Embodiment 2

[0033] Add 10 μg of CuS nanosheets (average particle size: 50 nm) to 0.1 L of sample solutions containing different concentrations (0-400 ppb) of mercury ions, and adsorb and enrich for 15 min at room temperature. The nanomaterials were concentrated into the filter membrane (volume 0.5 mL) by suction filtration, and the concentration factor was 200 times. Add 50 μL of 2,2'-azino-bis-3-ethylbenzothiazoline-6-sulfonic acid (10 mmol / L) and 5 μL of aqueous hydrogen peroxide (30%) in sequence. After the color reaction was carried out for 30 min, the absorbance signal of each solution was recorded and plotted using a UV-Vis spectrophotometer. Such as Figure 4 As shown, the absorbance difference of the sample has a linear relationship with the concentration of mercury ions. Therefore, it is proved that the method can quantitatively detect the mercury ion concentration in the sample.

Embodiment 3

[0035] Add 1 mg of CuS nanoflowers (average particle size 500 nm) to 10 L of sample solutions containing mercury ions at different concentrations (0-4 ppb), and then absorb and enrich for 30 min at room temperature. Concentrate the nanomaterials into the filter membrane (volume 0.5mL) by suction filtration, and the concentration factor is 20000 times. Add 50 μL of tetramethylbenzidine (10 mmol / L) and 5 μL of hydrogen peroxide solution (30%) in sequence. After the color reaction was carried out for 30 minutes, the concentration of mercury ions can be qualitatively analyzed by naked eye observation method according to the color of the sample. Such as Figure 5 As shown, as the concentration of mercury ions in the sample increases, the color of the chromogenic solution in the filter membrane gradually becomes lighter. In addition, the RGB signal of each sample is measured and plotted using a color sensor. Such as Figure 6 As shown, as the concentration of mercury ions in the...

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Abstract

The invention discloses an ultra-sensitive mercury pollution colorimetric detection method based on a copper sulfide nano material. The method comprises the following steps: dispersing a CuS nano material into a sample solution containing mercury ions, and carrying out selective adsorption and enrichment on mercury ions; filtering and concentrating by a suction filtration method; adding a color developing agent and hydrogen peroxide into the filter membrane, and carrying out a color developing reaction; and by observing the color and / or absorbance value of the reaction system, detecting the content of the mercury ions in the sample to be detected. The method has obvious advantages in detection of trace mercury pollution, does not depend on large instruments, is low in cost, portable, good in selectivity and high in sensitivity, and is suitable for field detection of mercury pollution in environment and food.

Description

technical field [0001] The invention relates to the field of environment and food analysis and detection. More specifically, it relates to an ultrasensitive colorimetric detection method for mercury pollution based on copper sulfide nanomaterials. Background technique [0002] Mercury pollution is extremely harmful to the environment and human health. Traditional mercury pollution detection methods often rely on large and expensive instruments and equipment, which are difficult to meet the actual needs of rapid and real-time detection (Kou Dongmei et al. Environmental Science and Technology. 2008, 31, 24-28). Compared with traditional detection methods, the mercury ion micro-nano colorimetric / fluorescent sensor has the advantages of simple operation, rapid detection, and does not depend on large-scale instruments (Shen Yang et al. Progress in Chemistry. 2019, 31, 536-549). [0003] Based on the principle that mercury ions can induce and enhance the enzyme-like activity of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78G01N1/40
CPCG01N21/78G01N1/40
Inventor 贺军辉张跃房雨萌
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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