Method for extracting benzotriazole compound from water

A technology of benzotriazoles and compounds, which is applied in the field of extraction of benzotriazoles compounds, can solve the problems of solid phase extraction column waste, complicated operation, environmental pollution, etc., and achieves the promotion of distribution, simple operation, and good extraction effect Effect

Active Publication Date: 2017-05-31
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] According to current applications, the main pretreatment methods for benzotriazole compounds in environmental samples are solid-phase extraction (SPE) and liquid-phase extraction (LLE). However, SPE requires a large sample volume (0.5-1L) and is complicated to operate. , the one-time use of the solid phase extraction column brings waste and high cost, and finally requires a large amount of toxic organic solvents for elution
On the basis of LLE, related scholars introduced dispersion liquid-liquid microextraction (DLLME), which avoids the shortcomings of traditional extraction methods, and has the advantages of small sample and extractant volume, but toxic dispersants (acetonitrile, methanol, acetone, etc.) ) still causes environmental pollution

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  • Method for extracting benzotriazole compound from water
  • Method for extracting benzotriazole compound from water
  • Method for extracting benzotriazole compound from water

Examples

Experimental program
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Effect test

Embodiment 1

[0037] A method for extracting benzotriazole compounds from water, see figure 1 , including the following steps:

[0038] (1) Preparation before extraction:

[0039] 1.1. Prepare a glass extraction bottle, see figure 2 : The glass extraction bottle is a round bottom glass tube with a thin neck opening on the top of the round bottom glass tube. Wherein the diameter of the round bottom glass tube bottle body is 20mm, and the length is 65mm. The length of the narrow neck opening is 30mm, and the diameter of the bottle mouth is 2mm (1~2mm all can be).

[0040] 1.2. After passing ultrapure water through a 0.45 μm glass fiber filter membrane, add 1H-benzotriazole (CAS: 95-14-7), 5-methylbenzotriazole (CAS: 136-85-6), Standard solution of 5-chlorobenzotriazole (CAS: 94-97-3), mix well to obtain water sample. The concentrations of 1H-benzotriazole, 5-methylbenzotriazole and 5-chlorobenzotriazole in the water samples were all 200ppb.

[0041] (2) Water sample pretreatment: Take ...

Embodiment 2

[0058] A method for extracting benzotriazole compounds from water, investigating the influence of different pH on extraction efficiency, using 0.1M dilute hydrochloric acid or sodium hydroxide to adjust the pH of the water sample to 3, 7, 9, 12 respectively, and the remaining treatment Step is consistent with embodiment 1. The enrichment factor of benzotriazole compounds in the organic phase after extraction was investigated. See Table 2 for the inspection results.

[0059] Table 2: The enrichment multiple detection result of embodiment 2

[0060]

[0061] As can be seen from Table 2: when the pH was less than 7, the content of the target substance in the organic phase was high, which proved that the extraction effect was good; when the pH was greater than 7, the content of the target substance in the organic phase began to decrease, and when the pH reached 12, the organic phase The content of the target substance in the phase decreases sharply, because when the pH is gre...

Embodiment 3

[0063] A method for extracting benzotriazole compounds from water, investigating the influence of the salt concentration in the water sample on the extraction efficiency, adding sodium chloride so that the salt concentration in the water sample is 5% (W / V), 25% respectively (W / V), saturated, the amount of n-hexanol used was 100 μL, and the remaining processing steps were consistent with Example 1. The enrichment factor of benzotriazole compounds in the organic phase after extraction was investigated. See Table 2 for the inspection results.

[0064] Table 3: The enrichment multiple detection result of embodiment 3

[0065]

[0066] It can be seen from Table 3 that the higher the concentration of the salt in the aqueous solution, the better the extraction effect, because the salt concentration in the aqueous solution is conducive to promoting the distribution of the target substance from the aqueous phase to the organic phase, thereby improving the concentration of the targe...

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Abstract

The invention discloses a method for extracting a benzotriazole compound from water. The method comprises the following steps: pre-treating a water sample, wherein the pH of the water sample is smaller than the pKa value of the benzotriazole compound and the massic volume concentration of the salt is greater than or equal to 10%; transferring the pre-treated water sample to a glass extraction bottle and adding an extraction agent to obtain a mixture; sucking the mixture to a needle cylinder of a glass injector and then pushing a piston of the glass injector to push the mixture in the needle cylinder to the glass extraction bottle; repeating sucking and pushing steps to transfer a target to the extraction agent in an accelerate manner; and then centrifugalizing the mixture to obtain a two-phase solution, wherein an organic phase of the two-phase solution comprises the benzotriazole compound. According to the extraction method disclosed by the invention, use of a dispersant can be avoided, and the method has the advantages of environment friendliness, simple operation, short extraction time, good extraction effect, relatively high enrichment and the like.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a method for extracting benzotriazole compounds from water. Background technique [0002] Benzotriazoles (BTRs) are an important fine chemical product, widely used in industrial and household cleaning products, with an annual output of 10,000 tons. BTRs are mainly used as corrosion inhibitors for copper and copper alloys, deicing agents, metal rust inhibitors, preservatives for synthetic detergents, polymer material stabilizers, plant growth regulators, anti-tarnish agents, gas phase corrosion inhibitors and ultraviolet light absorber. At present, benzotriazole has been identified as a new class of pollutants. It has a relatively stable structure and a low octanol-water partition coefficient. It is ubiquitous in surface water and soil and is cytotoxic to plants and aquatic organisms. Possibly carcinogenic to humans. A study detected 1H-benzotriazole, 5-methylb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/08G01N30/74
CPCG01N30/08G01N30/74
Inventor 李海普陆静杨兆光
Owner CENT SOUTH UNIV
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