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Method for detection of arsenic in underground water

A detection method and groundwater technology, applied in material excitation analysis, Raman scattering, etc., can solve the problems of lack of independent innovation technology in arsenic speciation analysis, weak research and development in the field of field monitoring, etc.

Inactive Publication Date: 2016-04-06
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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Problems solved by technology

[0007] In view of the lack of independent innovation technology for arsenic speciation analysis in my country and the relatively weak research and development strength in the field of on-site monitoring, the present invention combines the specific extraction characteristics of magnetic iron ferric oxide nanomaterials for heavy metals and the surface-enhanced Raman scattering effect of noble metal nanoparticles. Combined to improve the sensitivity, selectivity and anti-matrix interference ability of nanoparticles for arsenic detection

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  • Method for detection of arsenic in underground water
  • Method for detection of arsenic in underground water
  • Method for detection of arsenic in underground water

Examples

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Embodiment 1

[0017] Embodiment 1 gets 0.1 gram of Fe 3 o 4 After washing the nanoparticles several times with absolute ethanol, transfer them into a 100mL three-necked round bottom flask, add 50mL of absolute ethanol to disperse the particles, then add 1mL APTMS and stir evenly for 3.5h. The obtained product was washed with absolute ethanol before use. Take the Fe modified by APTMS 3 o 4 Add 18 mL of silver nitrate solution with a concentration of 0.02 g / mL and 20 μL of potassium hydroxide solution with a concentration of 0.032 g / mL in a 100 mL three-necked round-bottomed flask, and stir evenly. 800 μL of aqueous ammonia, 1 mL of silver nitrate solution with a concentration of 0.06 g / mL, and 40 μL of aqueous ammonia with a concentration of 5% was added dropwise. After stirring for 5 minutes, add 3 mL of anhydrous methanol, 10 μL of sodium polyphosphate solution with a concentration of 0.1 g / mL, and 40 μL of a solution of disodium hydrogen phosphate with a concentration of 0.05 g / mL. F...

Embodiment 2

[0018] Embodiment 2 gets 0.1 gram of Fe 3 o 4 Nanoparticles were washed several times with absolute ethanol, then transferred into a 100mL three-necked round-bottomed flask, 50mL of absolute ethanol was added to disperse the particles, and then 2mL APTMS was added and stirred evenly for 3.5h. The obtained product was washed with absolute ethanol before use. Take the Fe modified by APTMS 3 o 4 Nanoparticles were placed in a 100mL three-necked round bottom flask, and 36mL of silver nitrate solution with a concentration of 0.02g / mL and 20μL of potassium hydroxide solution with a concentration of 0.032g / mL were added and stirred evenly, and the mixed solution was added dropwise with a concentration of 25 % ammonia water 1mL, the concentration is 0.06g / mL silver nitrate solution 1.5mL, and then the concentration is 6% ammonia water 150μL. After stirring for 5 minutes, add 6 mL of anhydrous methanol, 20 μL of sodium polyphosphate solution with a concentration of 0.1 g / mL, and 80...

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Abstract

The invention relates to a method for detection of arsenic in underground water. The method adopts core-shell type Fe3O4 / Ag magnetic nanoparticles as the SERS substrate for enrichment and detection of arsenic in groundwater, and acquires an SERS spectrogram of trivalent arsenic and pentavalent arsenic through a portable Raman spectrometer. A series of experiments prove that the detection method adopted by the invention is simple and easy to operate, and can realize rapid detection of arsenic contaminated groundwater samples.

Description

technical field [0001] The invention relates to the field of environmental monitoring, in particular to a method for detecting arsenic in groundwater. technical background [0002] Raman spectroscopy (RS) technology is a molecular structure characterization technology based on the Raman scattering effect. Conventional Raman spectroscopy technology has a wide range of applications in the fields of crystal properties, molecular structure and analytical chemistry. Surface-enhanced Raman scattering (SERS) is widely used in surface research, adsorbate interface surface, etc. State research, interface orientation and configuration of biological macromolecules, conformational research and structural analysis, etc. [0003] Both conventional Raman spectroscopy and surface-enhanced Raman spectroscopy cannot break through the optical diffraction limit in principle, and their research objects are very limited. Although SERS technology has become a research hotspot in the field of pol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65
Inventor 景传勇田中群王磊刘国坤
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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