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Application method of magnesium oxide microsphere in environmental water sample

An application method and technology of magnesium oxide, which can be used in measuring devices, instruments, scientific instruments, etc., can solve the problems of unfavorable effects, high cost, and complicated preparation process of solid-phase extraction adsorbents.

Inactive Publication Date: 2011-10-19
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
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Problems solved by technology

However, these adsorbents also have some disadvantages when used: on the one hand, the preparation process of some solid phase extraction adsorbents is relatively complicated and the cost is relatively high; on the other hand, the applicable range of silica gel matrix adsorbents is pH=2-8 , alkaline conditions will not be conducive to its function in the application

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  • Application method of magnesium oxide microsphere in environmental water sample
  • Application method of magnesium oxide microsphere in environmental water sample
  • Application method of magnesium oxide microsphere in environmental water sample

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preparation example Construction

[0022] (3) Preparation of solid-phase extraction column: select magnesium oxide microspheres with a particle size of less than 320 meshes and fill them into empty solid-phase extraction tubes by dry method, and place matching filter sieve plates on the upper and lower sides respectively.

[0023] (4) Column balance: Use non-polar organic solvents, organic modifiers, and an aqueous solution of organic modifiers with a volume ratio of 0-30% to carry out column balance for the solid-phase extraction column in order to remove the solid-phase extraction adsorbent impurities contained in it.

[0024] (5) Sample loading: pass the water sample to be tested through the solid phase extraction column at a certain flow rate.

[0025] (6) Rinse: rinse with 3mL deionized water to remove retained or adsorbed polar compounds. After the rinsing is completed, use a vacuum pump to fully drain the water in the solid phase extraction tube to prevent the remaining water from affecting the next ste...

Embodiment 1

[0029] Fill 200 mg of magnesium oxide microspheres into an empty solid-phase extraction tube (6 mL) by dry method, and place matching filter sieves on the top and bottom respectively. Before sample loading, equilibrate the solid-phase extraction column with dichloromethane, methanol, and water respectively; then dilute 1 mL of PAHs standard solution with deionized water to 20 mL (containing phenanthrene 14 μg / L, anthracene 11 μg / L, pyrene 31.5 μg / L L, benzo[a]pyrene 16.5 μg / L, dibenzoanthracene 12 μg / L), be prepared into the solution to be tested; then the prepared solution to be tested is passed through the solid-phase extraction column at a flow rate of 1.0mL / min, after that Rinse with 3mL of deionized water. After the rinsing is completed, use a vacuum pump to fully drain the water in the solid-phase extraction tube, and then use 5mL of dichloromethane to extract the substances to be tested (phenanthrene, anthracene, pyrene, benzo[a]pyrene, Dibenzanthracene) eluted. After ...

Embodiment 2

[0031]Fill 200 mg of magnesium oxide microspheres into an empty solid-phase extraction tube (6 mL) by dry method, and place matching filter sieves on the top and bottom respectively. Before sample loading, use dichloromethane, methanol and three volume ratios (5%, 15%, 25%) of methanol aqueous solution to equilibrate the three solid-phase extraction columns; (1mL, 3mL, 5mL) was diluted with deionized water to 20mL (containing phenanthrene 14μg / L, anthracene 11μg / L, pyrene 31.5μg / L, benzo[a]pyrene 16.5μg / L, dibenzoanthracene 12μg / L ), so that the content of methanol in the aqueous solution is respectively (a) 5% (b) 15% (c) 25%, thereby being mixed with different solutions to be tested; Pass through the corresponding three solid-phase extraction columns respectively, and then rinse with 3mL deionized water. After the rinse is completed, use a vacuum pump to fully drain the water in the solid-phase extraction tube, and then use 5mL of dichloromethane to extract the substance to ...

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Abstract

The invention relates to an application of a magnesium oxide microsphere in environmental water samples, and particularly a method of using a magnesium oxide microsphere as a solid phase extraction adsorbent for enrichment of polycyclic aromatic hydrocarbons in environmental water samples. A solid phase extraction empty tube is filled by a dry method; various experimental parameters of the solid phase extraction process (column equilibrium, sample application, leaching, elution) are optimized, including the type (methanol, isopropanol, acetone...) and the concentration (0-30%) of a modification agent, the type (dichloromethane, n-hexane, ethyl acetate...) of an elution solvent, the sample applying volume (10-250 mL), the sample applying flow rate (1.0-10.0 mL / min), so as to obtain an optimal condition; and finally the method is applied to the enrichment of polycyclic aromatic hydrocarbons in environmental water samples. The invention has the advantages of simple operations, low cost, environment-friendly performance, and high efficiency.

Description

technical field [0001] The invention relates to the application of magnesium oxide microspheres in environmental water samples, in particular to a method for enriching polycyclic aromatic hydrocarbons in environmental water samples by using magnesium oxide microspheres as a solid-phase extraction adsorbent. Background technique [0002] Polycyclic aromatic hydrocarbons refer to aromatic hydrocarbons containing two or more benzene rings in their molecules, which mainly come from forest fires and volcanic eruptions. In the production and living environment of human beings, the burning, cooking, and waste incineration of various petroleum fractions such as coal mines, firewood, tobacco leaves, gasoline, diesel oil, and heavy oil can cause pollution of polycyclic aromatic hydrocarbons in the environment. In addition, the gasification and liquefaction process of coal and the cracking process of petroleum can also produce polycyclic aromatic hydrocarbons. Because these compounds ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/08G01N30/36
Inventor 金静李云卢宪波倪余文陈吉平
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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