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Measuring method of structural isomers of perfluorochemicals in atmospheric particulate sampling membrane

A technology for atmospheric particulate matter and perfluorinated compounds, which is applied in the direction of measuring devices, material separation, and analysis of materials, can solve the problems of complex extraction process, long time-consuming, and long detection time, and achieve improved detection efficiency, accurate detection, and high sensitivity. Effect

Inactive Publication Date: 2019-05-28
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

The above method can realize the determination of isomers of perfluorinated compounds in soil and / or plants, but the extraction process of this method is relatively complicated and time-consuming: first, the soil or plant samples should be extracted three times by ion-pair extraction , each time for 6-12h, and then combine the supernatants extracted three times, and successively use nitrogen blowing, filtration, solid phase extraction, elution, and nitrogen blowing again to concentrate and purify, not suitable for atmospheric particulate matter sampling filter membranes Determination of isomers of perfluorinated compounds
In addition, this method requires 45 minutes of gradient elution to complete the detection of all isomers, which takes a long time and is not suitable for batch determination of a large number of samples

Method used

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  • Measuring method of structural isomers of perfluorochemicals in atmospheric particulate sampling membrane
  • Measuring method of structural isomers of perfluorochemicals in atmospheric particulate sampling membrane
  • Measuring method of structural isomers of perfluorochemicals in atmospheric particulate sampling membrane

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Embodiment 1

[0058] Determination of Perfluorinated Compound Isomers in Example 1 Atmospheric Particulate Matter Sampling Filter Membrane

[0059] The method for determining the isomers of perfluorinated compounds in the atmospheric particulate matter sampling filter membrane comprises the following steps:

[0060] 1) Sample extraction: Dry the air sampling membrane to a constant weight and cut it into 1*1cm size with clean scissors, add 15ml of methanol to it, and add an appropriate amount of internal standards M8PFOS and M3PFHxS, vortex for 5min and transfer to Shake horizontally for 15 minutes, then ultrasonically extract for 1 hour; ultrasonic conditions are: ultrasonic power 700W, ultrasonic frequency 45KHZ; temperature control 40°C; after ultrasonic extraction, transfer the supernatant to a clean centrifuge tube, then add 15ml of methanol to repeat the above shaking and ultrasonic extraction steps Three times, the supernatants were combined, and the extracts were collected.

[0061]...

Embodiment 2

[0087] Example 2 The standard addition recovery rate test of PFOS and PFHxS isomers in the air sampling membrane sample

[0088] The blank air sampling filter membrane (quartz filter membrane) was calcined in a muffle furnace at 450°C for 6 hours, cooled to room temperature, and dried in a desiccator to constant weight for use. Atmospheric sampling filter (quartz filter) samples were collected from the roof of the Sun Yat-sen University School of Public Health.

[0089] Take three blank filter membranes, cut each into four parts with the same area, take two parts for each and cut them into 1*1cm size. Use clean tweezers to clip six pieces of filter membrane fragments representing the three blank filter membranes into six polypropylene centrifuge tubes, and add 15ml of methanol to them.

[0090] After the atmospheric sampling filter membrane sample is dried to a constant weight, take three samples and use clean scissors to cut each filter membrane into four parts with the same...

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Abstract

The invention discloses a measuring method of structural isomers of perfluorochemicals in an atmospheric particulate sampling membrane, and belongs to the technical field of environmental monitoring.The measuring method comprises the following steps of 1, sample extracting, wherein the atmospheric particulate sampling membrane is subjected to ultrasonic extraction, and thus an extraction solutionis collected and obtained; 2, sample purifying, wherein the extraction solution obtained in step 1 is purified, concentrated and repurified, and thus a sample detection solution is obtained; 3, sample measuring, wherein the sample detection solution obtained in step 2 is detected by an ultra-performance liquid chromatography-triple quadrupole tandem mass spectrometer, quantitative calculation isconducted through an internal standard method, and thus the content of the structural isomers of the perfluorochemicals in the atmospheric particulate sampling membrane is obtained. By the adoption ofthe measuring method, the structural isomers of the perfluorochemicals in the atmospheric particulate sampling membrane are sufficiently extracted and measured.

Description

technical field [0001] The invention belongs to the technical field of environmental monitoring, and in particular relates to a method for measuring isomers of perfluorinated compounds in atmospheric particle sampling filter membranes. Background technique [0002] Perfluoroalkyl Substances (PFASs) are a class of synthetic chemical surfactants, mainly represented by perfluoroalkyl carboxylic acids (PFCAs) and perfluoroalkyl sulfonic acids (PFSAs), which are mainly used in the chemical industry and field of semiconductor manufacturing. Due to the abundance, persistence and bioaccumulation in the environment, PFASs have been clearly restricted in production and use in many countries. [0003] The main production methods of PFASs include Electrochemical Fluorination (ECF) and Telomerization. The telomerization method mainly obtains a single straight-chain compound, but in the production process, homologue by-products with different carbon chain lengths can be produced; while ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/02G01N30/06
Inventor 董光辉曾晓雯胡立文刘珊许姝丽
Owner SUN YAT SEN UNIV
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