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In-situ microextraction and portable Raman spectrometer combined method for determining polycyclic aromatic hydrocarbon

A Raman spectrometer and polycyclic aromatic hydrocarbon technology, applied in the field of analytical chemistry, can solve the problems of long analysis time, tedious process, loss of sample impurities, etc., and achieve the effect of simple measurement method, broad application prospects, and avoiding the introduction of errors

Inactive Publication Date: 2016-06-01
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The traditional process of pretreatment, enrichment and detection of samples is cumbersome, and each step of operation will lose samples and introduce impurities, and errors will accumulate, which will have a certain impact on the detection results, and the analysis time will be longer

Method used

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  • In-situ microextraction and portable Raman spectrometer combined method for determining polycyclic aromatic hydrocarbon
  • In-situ microextraction and portable Raman spectrometer combined method for determining polycyclic aromatic hydrocarbon
  • In-situ microextraction and portable Raman spectrometer combined method for determining polycyclic aromatic hydrocarbon

Examples

Experimental program
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Effect test

Embodiment 1

[0037] A method for in-situ microextraction-Raman spectrometer combined determination of polycyclic aromatic hydrocarbons on food contact materials, the steps are as follows:

[0038] (1) Silver nanoparticles surface modified thiol: absorb 0.5mL propanethiol concentration to 1×10 -4 mol / L methanol solution was added dropwise to a concentration of 2.51×10 -11 mol / L silver nanoparticle solution 10ml, stirring reaction time 10min. Connected by Raman spectrometer to obtain the silver nanoparticle solution with surface modification of mercaptan;

[0039] (2) Micro-extraction of polycyclic aromatic hydrocarbons in food-contact materials: take 5 μL of methanol and drop it on the surface of food-contact materials for 2 minutes for micro-extraction to obtain an extract solution;

[0040] (3) Raman spectrometer detects polycyclic aromatic hydrocarbons: the surface-modified silver nanoparticle solution with thiol prepared in step (1) is concentrated 10 times and mixed with the extract s...

Embodiment 2

[0041] Embodiment 2: with the method of embodiment 1 in-situ microextraction-Raman spectrometer joint determination polycyclic aromatic hydrocarbons on food contact materials,: difference is: the alcoholic solution of mercaptan in step (1) is ethanethiol concentration 1×10 -4 mol / L methanol solution.

Embodiment 3

[0042] Embodiment 3: with the method of embodiment 1 in-situ microextraction-Raman spectrometer joint determination polycyclic aromatic hydrocarbons on food contact materials,: difference is: the alcoholic solution of mercaptan in step (1) is n-butanethiol The concentration is 1×10 -4 mol / L methanol solution.

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Abstract

The invention relates to an in-situ microextraction and portable Raman spectrometer combined method for determining polycyclic aromatic hydrocarbon. The method comprises the following steps: performing mercaptan modification on silver nanoparticle surfaces and microextraction on polycyclic aromatic hydrocarbon in a food contact material, condensing the prepared silver nanoparticle solution modified with mercaptan on the surface to be 10-100 folds, then mixing the concentrated solution with the extract solution in situ according to a volume ratio of the concentrated solution to the extract solution being (1-2):(1-2), and adopting the Raman spectrometer to detect surface enhancement Raman spectroscopy signals of polycyclic aromatic hydrocarbon, so as to obtain the polycyclic aromatic hydrocarbon surface enhancement Raman spectroscopy signals. According to the invention, the extraction method and the surface enhancement Raman spectroscopy method are combined, the extracting solution is not required to be transferred into a detector, but the pollutant can be detected in situ, so that the sample pretreatment procedure can be avoided and the error introduced during the pretreatment process can be avoided; the determination method is simple, environment-friendly, rapid and capable of solving the problem that the food contact material is required to be screened rapidly on the site to prevent migration of polycyclic aromatic hydrocarbon into the food.

Description

technical field [0001] The invention relates to an in-situ microextraction-portable Raman spectrometer combined method for determining polycyclic aromatic hydrocarbons, belonging to the technical field of analytical chemistry. Background technique [0002] Polycyclic aromatic hydrocarbons (PolycyclicAromaticHydrocarbon, PAHs) are persistent organic pollutants (PersistentOrganicPollutants, POPs). It has received widespread attention due to its bioaccumulative, carcinogenic, teratogenic and mutagenic properties. PAHs in baby feeding bottles, toys, and tool handles can migrate into food or the human body, causing harm to humans. The European Union has corresponding requirements for the migration of pollutants in food contact materials such as plastics, metals, and paper ((EU) No10 / 2011.). Germany also controls the risk of polycyclic aromatic hydrocarbons passing through the skin through contact with the human body (BFROpinionNr.0322010, 26July.). The formulation of these sta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65
CPCG01N21/658
Inventor 占金华张旻
Owner SHANDONG UNIV
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