CN116718686A - Method for determining polycyclic aromatic hydrocarbon in thermoplastic elastomer - Google Patents
Method for determining polycyclic aromatic hydrocarbon in thermoplastic elastomer Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 36
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- 238000000605 extraction Methods 0.000 claims abstract description 36
- 238000001514 detection method Methods 0.000 claims abstract description 25
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- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 claims description 25
- 239000002904 solvent Substances 0.000 claims description 15
- 239000003480 eluent Substances 0.000 claims description 11
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 claims description 9
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 claims description 9
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 9
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- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 4
- 238000002137 ultrasound extraction Methods 0.000 claims description 4
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- HIXDQWDOVZUNNA-UHFFFAOYSA-N 2-(3,4-dimethoxyphenyl)-5-hydroxy-7-methoxychromen-4-one Chemical compound C=1C(OC)=CC(O)=C(C(C=2)=O)C=1OC=2C1=CC=C(OC)C(OC)=C1 HIXDQWDOVZUNNA-UHFFFAOYSA-N 0.000 description 2
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- 238000002203 pretreatment Methods 0.000 description 1
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Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/62—Plastics recycling; Rubber recycling
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- Other Investigation Or Analysis Of Materials By Electrical Means (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention discloses a method for measuring polycyclic aromatic hydrocarbon in a thermoplastic elastomer, which comprises the following steps: 1) Extracting: performing preliminary extraction on polycyclic aromatic hydrocarbon in a thermoplastic elastomer sample to obtain an extracting solution A; 2) Solid phase extraction: the extraction solution A in the step 1) is further extracted by a solid-phase extraction column special for polycyclic aromatic hydrocarbon, so that an extraction solution B is obtained, and the solid-phase extraction column special for polycyclic aromatic hydrocarbon can effectively adsorb polycyclic aromatic hydrocarbon compounds and effectively remove interference impurities; 3) And (3) detection: and quantitatively analyzing the extract B by using a gas-phase mass spectrometer. According to the invention, the special solid-phase extraction column for the polycyclic aromatic hydrocarbon is adopted, the column filler adopts the polymer with molecular imprinting for the polycyclic aromatic hydrocarbon compound, so that the polycyclic aromatic hydrocarbon can be accurately adsorbed, the interfering compound with the polarity similar to that of the polycyclic aromatic hydrocarbon can be more effectively removed through the special column for the polycyclic aromatic hydrocarbon, the recovery effect of the polycyclic aromatic hydrocarbon is improved, and the accuracy of polycyclic aromatic hydrocarbon detection is improved.
Description
Technical Field
The invention belongs to the field of a method for measuring polycyclic aromatic hydrocarbon, and particularly relates to a method for measuring polycyclic aromatic hydrocarbon in a thermoplastic elastomer.
Background
Polycyclic Aromatic Hydrocarbons (PAHs) are compounds in which more than two benzene rings and condensed rings are connected in a molecule, and have three-induced harm, so that various industries have detection requirements on the polycyclic aromatic hydrocarbons, and the detection requirements comprise multiple fields of electronic and electric products, cosmetics, water quality, soil and the like. Thermoplastic elastomers are a novel class of materials that possess both the processability of thermoplastics and the physical properties of vulcanized rubber. In recent decades, more and more thermoplastic elastomers have been developed and used, and are now widely used in the electronic and electrical industries such as low-smoke halogen-free flame retardant wires, cable materials and the like, as well as in the automotive industry, medical transfusion appliances and the like. Part of the polycyclic aromatic hydrocarbon of the thermoplastic elastomer is derived from rubber raw materials and white oil added as a softener, and the other part is derived from pyrolysis reaction occurring in the high-temperature processing process. White oil, also called white oil, is a colorless transparent odorless liquid oil, mainly C 16 -C 31 Mixtures of normal and isoparaffins, with 18 polycyclic aromatic hydrocarbons, predominantly C 10 -C 22 The compound with benzene ring and condensed ring connected has similar molecular polarity and affects the detection and analysis of polycyclic aromatic hydrocarbon.
Solid phase extractionSample pretreatmentTechnology mainly used for separating, purifying and enriching samplesA collection. The main purpose is to reduce the interference of sample matrix and improve the detection sensitivity. The solid phase extractant commonly used is one containing C 18 、C 8 Nitrile group,Amino groupThe development of special fillers with equigroups, novel fillers, can directly improve the level of low-content substances, especially trace test. The invention adopts the novel solid-phase extraction filler, and the polymer with molecular imprinting on the polycyclic aromatic hydrocarbon compound can remove the interference of similar molecules, accurately improve the trace test effect of the polycyclic aromatic hydrocarbon and improve the test accuracy.
Chinese patent application CN104181254a discloses a method for separating and determining polycyclic aromatic hydrocarbon in hot melt adhesive, which adopts a heating reflux method for extraction, a solid phase extraction column for purification, and a gas chromatography-mass spectrometry method for determining polycyclic aromatic hydrocarbon in hot melt adhesive. The invention refers to the use of a solid phase extraction column, but the additive white oil in the thermoplastic elastomer is predominantly C 16 -C 31 Mixtures of normal and isoparaffins, with 18 polycyclic aromatic hydrocarbons, predominantly C 10 -C 22 Compounds in which benzene rings are linked to condensed rings, the compounds having similar molecular polarities, conventional C 18 、C 8 The solid phase extraction column can not effectively separate two types of substances and directly influence the detection and analysis of polycyclic aromatic hydrocarbon, and the chromatogram provided by the invention shows that the impurity residues in the solid phase extraction process possibly cause baseline drift. The test range of the polycyclic aromatic hydrocarbon is 0.02 mu g/mL-10 mu g/mL.
The GB/T29616-2013 determination gas chromatography-mass spectrometry of polycyclic aromatic hydrocarbon of thermoplastic elastomer discloses a method for testing 16 polycyclic aromatic hydrocarbons in thermoplastic elastomer, wherein an internal standard is adopted to calibrate the 16 polycyclic aromatic hydrocarbons, and a traditional liquid-liquid extraction method is adopted to remove matrix interference in the thermoplastic elastomer. The testing method has the defects that: removing interference of other impurities in the white oil by adopting a liquid-liquid extraction mode; however, the liquid-liquid extraction process has the problem of emulsification, and has the advantages of more processing steps, more complicated operation and poor extraction and analysis effects of the target polycyclic aromatic hydrocarbon.
The Chinese patent application CN106290612A discloses a method for purifying polycyclic aromatic hydrocarbon in rubber products by pretreatment, which comprises the following stepsThe steps are as follows: weighing a proper amount of rubber sample, using a mixed solution of normal hexane and dichloromethane as a solvent, ultrasonically extracting polycyclic aromatic hydrocarbon according to the volume ratio of the normal hexane to the dichloromethane of 1:1, performing rotary evaporation and concentration on the ultrasonic extracting solution, purifying by a solid phase extraction column, and analyzing and quantifying the polycyclic aromatic hydrocarbon by using a gas chromatography-mass spectrometer. The technical scheme of the patent application has the defects that: it is not suitable for extraction of polycyclic aromatic hydrocarbons from thermoplastic elastomers because of the addition of softener white oil, which is predominantly C 16 -C 31 The mixture of normal and isoparaffin affects the detection and analysis of polycyclic aromatic hydrocarbon, and the filler of the solid phase extraction column in the technical proposal of the patent is not applicable to the purification of white oil and is only a pretreatment method.
Chinese patent application CN106226418A discloses a quick, low-cost, simple and efficient polycyclic aromatic hydrocarbon detection method. The polycyclic aromatic hydrocarbon detection method comprises the following steps: extracting, (2) acidifying and removing impurities, (3) acidifying treatment, and (4) gas chromatography mass spectrometry detection. The detection method adopts weak organic phase solvent extraction with the polarity similar to that of polycyclic aromatic hydrocarbon, so that the interference of polar components in a sample on detection is reduced; the sample is subjected to acidification treatment by adopting sulfuric acid with a certain concentration (50-80%) and a certain amount (0.5-1.0 mL), so that the pretreatment of the sample is simple, the operation is easy, the cost is low, the impurity removal effect is obvious, meanwhile, the ionization efficiency of the polycyclic aromatic hydrocarbon in mass spectrum detection is improved by the acidification treatment, and the sensitivity of the mass spectrum on detection of 4 polycyclic aromatic hydrocarbons is effectively improved. The defect of the detection method is that: the standard substance is acidified by sulfuric acid to remove impurities, but the method is used for preparing main component C of white oil in thermoplastic elastomer 16 -C 31 The mixture of normal and isoparaffin reacts with sulfuric acid, so that the effective impurity removal effect cannot be achieved, and the detection method can only detect 4 polycyclic aromatic hydrocarbons, so that whether the detection requirement of trace test can be met is unknown.
In view of this, there is an urgent need for a highly sensitive and practical method for detecting the polycyclic aromatic hydrocarbon content in thermoplastic elastomers.
Disclosure of Invention
The invention aims to provide a method for measuring polycyclic aromatic hydrocarbon in a thermoplastic elastomer; the detection method overcomes the defects of the traditional extraction method, adopts solid phase extraction to remove additive interference of thermoplastic elastomer, particularly uses a solid phase extraction column special for polycyclic aromatic hydrocarbon, uses a polymer with molecular imprinting on the polycyclic aromatic hydrocarbon compound, can effectively adsorb the polycyclic aromatic hydrocarbon compound, directly removes interference impurities, and directly improves the recovery rate and accuracy of the polycyclic aromatic hydrocarbon. The test range of the invention is 0.0025 mu g/mL-0.3 mu g/mL, the invention meets the test requirement of the trace control of the polycyclic aromatic hydrocarbon, and the trace test level can show that the removal of the interference impurities is effective.
In order to solve the first technical problem, the invention adopts the following technical proposal：
A method for determining polycyclic aromatic hydrocarbons in thermoplastic elastomers, comprising the steps of:
1) Extracting:
performing preliminary extraction on polycyclic aromatic hydrocarbon in a thermoplastic elastomer sample to obtain an extracting solution A;
2) Solid phase extraction:
the extraction solution A in the step 1) is further extracted by a solid phase extraction column special for polycyclic aromatic hydrocarbon, so as to obtain an extraction solution B, wherein the solid phase extraction column can effectively adsorb polycyclic aromatic hydrocarbon compounds and effectively remove interference impurities;
3) And (3) detection:
and quantitatively analyzing the extract B by using a gas-phase mass spectrometer.
As an embodiment, in step 1), the preliminary extraction is selected from the group consisting of a soxhlet extraction method, an ultrasonic extraction method.
As an embodiment, in step 1), the solvent used in the preliminary extraction process is toluene, n-hexane, dichloromethane or ethyl acetate.
In one embodiment, in step 2), the column packing of the solid phase extraction column is a polymer molecularly imprinted for polycyclic aromatic compounds, CNWTechnologies brand, PAHs SPE Cartridge.
In step 2), the extract a of step 1) is concentrated by a rotary evaporator before further extracting the extract a by a solid phase extraction column special for polycyclic aromatic hydrocarbon.
In step 2), the extract A is concentrated and injected into a solid-phase extraction column special for polycyclic aromatic hydrocarbon by a rotary evaporator, and then the solid-phase extraction column special for polycyclic aromatic hydrocarbon is leached by a solvent with weaker polarity, and the leaching solution is discarded; the solvent with weaker polarity is n-hexane or petroleum ether.
In the step 2), eluting the solid phase extraction column by using a solvent with stronger polarity, and collecting the eluent; the solvent with stronger polarity is dichloromethane, chloroform or benzene.
In a preferred embodiment, in step 2), the eluent is concentrated by a rotary evaporator or nitrogen blower, and then transferred to a volumetric flask, and the volume is fixed by an organic solvent, thereby obtaining an extract B.
In one embodiment, in step 3), the gas phase mass spectrometer is used for quantitative analysis by adopting an ion monitoring mode.
Any range recited in the invention includes any numerical value between the endpoints and any sub-range of any numerical value between the endpoints or any numerical value between the endpoints.
Unless otherwise indicated, all starting materials herein are commercially available, and the equipment used in the present invention may be conventional in the art or may be conventional in the art.
Compared with the prior art, the invention has the following beneficial effects：
1) The invention avoids the emulsification problem of the traditional liquid-liquid extraction method;
2) The special solid phase extraction mode of the polycyclic aromatic hydrocarbon is adopted, the purification effect is good, the interfering substances such as normal and isoparaffin are effectively removed, and the accurate determination of the polycyclic aromatic hydrocarbon is facilitated;
3) The operation is simple, and the extraction time is short;
4) The extraction effect of the target polycyclic aromatic hydrocarbon is better, and more than 18 polycyclic aromatic hydrocarbons can be detected;
5) The invention has low detection limit and can meet the requirement of trace detection.
Drawings
The following describes the embodiments of the present invention in further detail with reference to the drawings
FIG. 1 is an ion flow diagram of the extraction of 18 polycyclic aromatic hydrocarbons from a standard sample of thermoplastic elastomer;
FIG. 2 is an ion flow diagram of the extraction of 18 polycyclic aromatic hydrocarbons from a blank sample;
fig. 3 is an ion flow diagram of the extraction of 18 polycyclic aromatic hydrocarbons from a labeled sample of thermoplastic elastomer.
Detailed Description
In order to more clearly illustrate the present invention, the present invention will be further described with reference to preferred embodiments. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and that this invention is not limited to the details given herein.
It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are merely for convenience in describing and simplifying the description based on the orientation or positional relationship shown in the drawings, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the existing research results, the interaction content among elements in mixed rare earth is less, the rare earth element proportion and content design scheme are still insufficient, the optimization effect is not obvious, and the mechanical property performance of the Mg-Al alloy added with the rare earth element is still not outstanding.
In view of this, as one aspect of the present invention, the present invention provides a method for determining polycyclic aromatic hydrocarbon in thermoplastic elastomer, comprising the steps of:
1) Extracting:
performing preliminary extraction on polycyclic aromatic hydrocarbon in a thermoplastic elastomer sample to obtain an extracting solution A;
2) Solid phase extraction:
the extraction solution A in the step 1) is further extracted by a solid phase extraction column special for polycyclic aromatic hydrocarbon, so as to obtain an extraction solution B, wherein the solid phase extraction column can effectively adsorb polycyclic aromatic hydrocarbon compounds and effectively remove interference impurities;
3) And (3) detection:
and quantitatively analyzing the extract B by using a gas-phase mass spectrometer.
As an embodiment, in step 1), the preliminary extraction is selected from the group consisting of a soxhlet extraction method, an ultrasonic extraction method.
As an embodiment, in step 1), the solvent used in the preliminary extraction process is toluene, n-hexane, dichloromethane or ethyl acetate.
In one embodiment, in step 2), the column packing of the solid phase extraction column is a polymer having molecular imprinting on polycyclic aromatic hydrocarbon compounds, CNWTechnologies brand, PAHs SPE Cartridge, which can effectively adsorb polycyclic aromatic hydrocarbon compounds, directly remove multiple interfering impurities, and promote recovery rate of polycyclic aromatic hydrocarbons.
In step 2), the extract a of step 1) is concentrated by a rotary evaporator before being further extracted by a solid phase extraction column.
In step 2), the extract A is concentrated and injected into a solid-phase extraction column special for the polycyclic aromatic hydrocarbon by a rotary evaporator, and then the solid-phase extraction column special for the polycyclic aromatic hydrocarbon is leached by a solvent with weaker polarity, so that interference impurities can be removed without affecting the adsorption of the polycyclic aromatic hydrocarbon in the solid-phase extraction column special for the polycyclic aromatic hydrocarbon, and the leaching solution is discarded; the solvent with weaker polarity is n-hexane or petroleum ether.
In some embodiments, in step 2), eluting the eluted solid phase extraction column with a more polar solvent to completely elute the polycyclic aromatic hydrocarbon compound, and collecting the eluent; the solvent with stronger polarity is dichloromethane, chloroform or benzene.
In certain embodiments, in step 2), the eluent is concentrated by a rotary evaporator or nitrogen blower, and then transferred to a volumetric flask, and the volume is fixed by an organic solvent, thereby obtaining extract B.
In certain embodiments, in step 3), the gas phase mass spectrometer is used for quantitative analysis by adopting an ion monitoring mode.
Example 1
A method for detecting 18 polycyclic aromatic hydrocarbons in thermoplastic elastomer comprises the following steps:
1) Extraction of
Weighing 0.5g of thermoplastic elastomer TPU powder sample, putting the sample into a 50.0mL triangular flask with a plug, adding 20.0mL of normal hexane, fully soaking the sample, putting the sample into an ultrasonic water bath device, and performing ultrasonic extraction for 60min at the water temperature of 60 ℃; after the extraction is completed, taking out the triangular flask, cooling to room temperature and uniformly mixing; transferring the extract into a rotary flask, washing the triangular flask with 3.0mL of n-hexane for multiple times, transferring the washing liquid into a rotary evaporation bottle, and concentrating to 1mL by using a rotary evaporator to obtain extract A;
2) Solid phase extraction
Purifying the impurity of the extracting solution and further extracting the polycyclic aromatic hydrocarbon by adopting a special solid-phase extraction column for adsorbing the polycyclic aromatic hydrocarbon; the method comprises the following specific steps:
the extraction column is injected with 5.0mL of dichloromethane, then 5.0mL of n-hexane, and the extraction column is used immediately after activation; injecting the extracting solution A into the activated small column, and eluting the test tube and the inner wall of the small column twice by using 5.0mL of n-hexane after the extracting solution A is completely drained; pouring 6.0mL of n-hexane again, draining by gravity, and discarding the eluent; injecting 10.0mL of dichloromethane, collecting eluent, concentrating the eluent to 1.0mL by a rotary evaporator, transferring the eluent to a 5.0mL volumetric flask, washing the rotary evaporator with 3.0mL of n-hexane for multiple times, transferring the washing liquid to the volumetric flask, adding an internal standard solution, and fixing the volume to obtain an extract B;
3) Detection of
Detecting by using GC (7890A) -MS (5975C) gas chromatography-mass spectrometer produced by Agilent company and DB-17MS chromatographic column produced by Agilent company, wherein all the reagents are chromatographic purity; quantitatively analyzing the extracting solution B by a gas-phase mass spectrometer, and adopting a selective ion monitoring mode, wherein the table 1 is used as a test reference; the standard working curves of 18 polycyclic aromatic hydrocarbons are shown in the following table 2, the test range is 2.5-300ng/mL, and the correlation coefficient (R2) of the test working curves is 0.9989-0.9999, which shows that the correlation of the 18 PAHs standard curves is good.
The chromatograms of thermoplastic elastomers (TPU) are shown in fig. 1-3, respectively:
FIG. 1 is an ion extraction flow diagram of 18 polycyclic aromatic hydrocarbons in a standard sample;
FIG. 2 is an ion flow diagram of the extraction of 18 polycyclic aromatic hydrocarbons from a blank sample;
fig. 3 is an ion flow diagram of the extraction of 18 polycyclic aromatic hydrocarbons from a labeled sample of thermoplastic elastomer.
As can be seen from fig. 1 to 3, 18 PAHs are effectively separated, and at trace level, the interfering impurities are effectively removed, so that the chromatogram baseline is stable.
To test the applicability of the present invention, 18 PAHs were extracted at standard concentrations of 5.0ng/mL, 20.0ng/mL and 100.0ng/mL, respectively, for thermoplastic elastomer sample 1 (TPU), and the results obtained from the standard recovery test are shown in Table 3 below.
As can be seen from Table 3, the extraction recovery rate of the target compound in the extraction sample of the invention is in the range of 81.73-109.64%, and the relative standard deviation is 0.67-3.65%, which proves that the invention is feasible and effective.
Table 1 qualitative and quantitative selection of ions of 18 polycyclic aromatic hydrocarbons and 3 internal standards
TABLE 2 Standard operating curves for 18 polycyclic aromatic hydrocarbons
TABLE 3 sample 1 labeled recovery and precision
The present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principles of the invention should be made in the equivalent manner and are included in the scope of the invention.
It is to be understood that the above examples of the present invention are provided by way of illustration only and not by way of limitation of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. Not all embodiments are exhaustive. All obvious changes or modifications which come within the spirit of the invention are desired to be protected.
Claims (9)
1. A method for determining polycyclic aromatic hydrocarbons in a thermoplastic elastomer comprising the steps of:
1) Extracting:
performing preliminary extraction on polycyclic aromatic hydrocarbon in a thermoplastic elastomer sample to obtain an extracting solution A;
2) Solid phase extraction:
the extraction solution A in the step 1) is further extracted by a solid phase extraction column special for polycyclic aromatic hydrocarbon, so as to obtain an extraction solution B, wherein the solid phase extraction column can effectively adsorb polycyclic aromatic hydrocarbon compounds and effectively remove interference impurities;
3) And (3) detection:
and quantitatively analyzing the extract B by using a gas-phase mass spectrometer.
2. The method for determining polycyclic aromatic hydrocarbon in thermoplastic elastomer according to claim 1, wherein: in step 1), the preliminary extraction is selected from the group consisting of Soxhlet extraction method, ultrasonic extraction method.
3. The method for determining polycyclic aromatic hydrocarbon in thermoplastic elastomer according to claim 1, wherein: in the step 1), the solvent used in the primary extraction process is toluene, n-hexane, dichloromethane or ethyl acetate.
4. The method for determining polycyclic aromatic hydrocarbon in thermoplastic elastomer according to claim 1, wherein: in the step 2), the column packing of the solid phase extraction column is a polymer with molecular imprinting on polycyclic aromatic hydrocarbon compounds, and the solid phase extraction column is selected from CNWTechnologies brand, PAHsSPE Cartridge.
5. The method for determining polycyclic aromatic hydrocarbon in thermoplastic elastomer according to claim 1, wherein: in the step 2), before the extract A in the step 1) is further extracted by selecting a solid phase extraction column special for polycyclic aromatic hydrocarbon, the extract A is concentrated by a rotary evaporator.
6. The method for determining polycyclic aromatic hydrocarbon in thermoplastic elastomer according to claim 5, wherein: in the step 2), after the extracting solution A is concentrated and injected into a solid-phase extraction column special for the polycyclic aromatic hydrocarbon by a rotary evaporator, eluting the solid-phase extraction column special for the polycyclic aromatic hydrocarbon by a solvent with weaker polarity, and discarding the eluent; the solvent with weaker polarity is n-hexane or petroleum ether.
7. The method for determining polycyclic aromatic hydrocarbon in thermoplastic elastomer according to claim 6, wherein: in the step 2), eluting the eluted solid phase extraction column special for the polycyclic aromatic hydrocarbon by using a solvent with stronger polarity, and collecting eluent; the solvent with stronger polarity is dichloromethane, chloroform or benzene.
8. The method for determining polycyclic aromatic hydrocarbon in thermoplastic elastomer according to claim 7, wherein: in the step 2), the eluent is concentrated by a rotary evaporator or a nitrogen blowing instrument, and then transferred to a volumetric flask, and the volume is fixed by an organic solvent, thus obtaining an extract B.
9. The method for determining polycyclic aromatic hydrocarbon in thermoplastic elastomer according to claim 1, wherein: in the step 3), an ion monitoring mode is adopted during quantitative analysis of the gas-phase mass spectrometer.
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