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Ambient air. Determination of benzene and its analogies using sorbent adsorption thermal desorption and gas chromatography
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HJ 583-2010
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Standards related to: HJ 583-2010
Standard ID | HJ 583-2010 (HJ583-2010) | Description (Translated English) | Ambient air. Determination of benzene and its analogies using sorbent adsorption thermal desorption and gas chromatography | Sector / Industry | Environmental Protection Industry Standard | Classification of Chinese Standard | Z15 | Classification of International Standard | 13.040.20 | Word Count Estimation | 15,186 | Date of Issue | 2010-09-20 | Date of Implementation | 2010-12-01 | Older Standard (superseded by this standard) | GB/T 14677-1993 | Drafting Organization | Dalian Municipal Environmental Monitoring Center | Administrative Organization | Ministry of Environment Protection | Regulation (derived from) | Department of Environmental Protection Notice No. 68 of 2010 | Summary | This standard specifies the determination of BTEX in air solid adsorption/thermal desorption gas chromatography. This standard applies to the ambient air and indoor air benzene, toluene, ethylbenzene, o-xylene, m-xylene, p-xylene, cumene and styrene determination. This standard also applies to the low ambient temperature exhaust gas BTEX concentration determination. If the sample size is 1L, benzene, toluene, ethylbenzene, o- xylene, m-xylene, p-xylene, cumene and styrene, and the measurement lower limit of detection, Table l. |
HJ 583-2010
Ambient air.Determination of benzene and its analogies using sorbent adsorption thermal desorption and gas chromatography
National Environmental Protection Standard of the People's Republic
Replace GB/T 14677-93
Determination of benzene in ambient air
Solid adsorption/thermal desorption-gas chromatography
Ambient air-Determination of benzene and its analogies using sorbent
Adsorption thermal desorption and gas chromatography
Released on.2010-09-20
2010-12-01 Implementation
Ministry of Environmental Protection released
Ministry of Environmental Protection
announcement
No. 68 of.2010
In order to implement the "Environmental Protection Law of the People's Republic of China", protect the environment, and protect human health, we now approve the "environmental air benzene series"
Five standards, such as solid adsorption/thermal desorption-gas chromatography, are considered as national environmental protection standards and are released.
The standard name and number are as follows.
2. Determination of Benzene in Ambient Air Activated Carbon Adsorption/Carbon Disulfide Desorption - Gas Chromatography (HJ 584-2010);
3. Determination of free chlorine and total chlorine in water, N,N-diethyl-1,4-phenylenediamine titration method (HJ 585-2010);
4. Determination of free chlorine and total chlorine in water - N,N-diethyl-1,4-phenylenediamine spectrophotometric method (HJ 586-2010);
V. "Determination of water quality atrazine by high performance liquid chromatography" (HJ 587-2010).
The above standards have been implemented since December 1,.2010 and published by the China Environmental Science Press. The standard content can be found on the website of the Ministry of Environmental Protection.
From the date of implementation of the above standards, the following four national environmental protection standards approved and issued by the former National Environmental Protection Agency shall be abolished.
The name and number are as follows.
I. Determination of Air Quality, Toluene, Xylene and Styrene by Gas Chromatography (GB/T 14677-93);
2. Determination of Air Quality Styrene by Gas Chromatography (GB/T 14670-93);
3. Determination of free chlorine and total chlorine in water. N,N-diethyl-1,4-phenylenediamine titration method (GB 11897-89);
4. Determination of free chlorine and total chlorine in water quality N,N-Diethyl-1,4-phenylenediamine spectrophotometric method (GB 11898-89).
Special announcement.
September 20,.2010
Content
Foreword..iv
1 Scope..1
2 Method principle..1
3 reagents and materials.1
4 instruments and equipment. 2
5 samples. 2
6 Analysis steps..3
7 Calculation and representation of results..5
8 precision and accuracy..5
9 Quality Assurance and Quality Control 5
Appendix A (informative) Filling method of packed column..7
Appendix B (informative) Safe sampling volume of benzene series 8
Appendix C (informative) Summary of precision and accuracy Table 9
Iv
Foreword
In order to implement the Environmental Protection Law of the People's Republic of China and the Law of the People's Republic of China on the Prevention and Control of Air Pollution, protect the environment and protect people
The body is healthy, and the method for determining the determination of benzene in the air is formulated.
This standard specifies the determination of benzene, toluene, ethylbenzene, o-xylene, m-xylene, p-xylene, isopropyl in ambient air and indoor air.
Solid adsorption/thermal desorption of benzene and styrene - gas chromatography.
This standard is a revision of the "Gas Chromatography for the Determination of Air Quality of Toluene, Xylene and Styrene" (GB/T 14677-93).
This standard was first published in.1993. The original standard drafting unit was Shenyang Environmental Science Research Institute. This is the first revision. This repair
The main contents of the subscription are as follows.
-- Revise the standard name to "Determination of Benzene in Ambient Air by Solid Adsorption/Thermal Desorption - Gas Chromatography";
-- The target component is increased from five to eight;
- modifying the standard solution matrix from carbon disulfide to methanol;
-- Added secondary desorption capillary column analysis method;
-- Added quality assurance and quality control provisions.
As of the date of implementation of this standard, the national environmental protection standard “Air” approved and issued by the former National Environmental Protection Agency on September 18,.1993
Determination of mass of toluene, xylene and styrene by gas chromatography (GB/T 14677-93) is abolished.
Appendix A to Appendix C of this standard are informative annexes.
This standard was formulated by the Science and Technology Standards Department of the Ministry of Environmental Protection.
This standard is mainly drafted by. Dalian Environmental Monitoring Center.
This standard is verified by. Anshan Environmental Monitoring Center Station, Jinzhou Environmental Monitoring Center Station, Shenyang Environmental Monitoring Center Station, Liaoning
Provincial Environmental Monitoring Experimental Center and Yingkou Environmental Monitoring Center Station.
This standard was approved by the Ministry of Environmental Protection on September 20,.2010.
This standard has been implemented since December 1,.2010.
This standard is explained by the Ministry of Environmental Protection.
Determination of benzene in ambient air
Solid adsorption/thermal desorption-gas chromatography
1 Scope of application
This standard specifies solid adsorption/thermal desorption-gas chromatography for the determination of benzene in air.
This standard applies to ambient air and indoor air benzene, toluene, ethylbenzene, o-xylene, m-xylene, p-xylene, cumene and
Determination of styrene. This standard is also applicable to the determination of benzene series in low concentration exhaust gas at normal temperature.
Method for benzene, toluene, ethylbenzene, o-xylene, m-xylene, p-xylene, cumene and styrene when the sampling volume is 1 L
The detection limit and the lower limit of measurement are shown in Table 1.
Table 1 Method detection limit and lower limit of measurement
Unit. mg/m3
Component capillary column gas chromatography packed column gas chromatography method detection limit detection limit method detection limit lower limit
Benzene 5.0×10−4 2.0×10−3 5.0×10−4 2.0×10−3
Toluene 5.0×10−4 2.0×10−3 1.0×10−3 4.0×10−3
Ethylbenzene 5.0×10−4 2.0×10−3 1.0×10−3 4.0×10−3
Paraxylene 5.0×10−4 2.0×10−3 1.0×10−3 4.0×10−3
M-xylene 5.0×10−4 2.0×10−3 1.0×10−3 4.0×10−3
O-xylene 5.0×10−4 2.0×10−3 1.0×10−3 4.0×10−3
Cumene 5.0×10−4 2.0×10−3 1.0×10−3 4.0×10−3
Styrene 5.0×10−4 2.0×10−3 1.0×10−3 4.0×10−3
2 Principle of the method
Enriching ambient air or benzene in indoor air at room temperature with a packed tube of poly 2,6-diphenyl-p-phenylene ether (Tenax)
The sample tube is connected to the thermal desorber, and after heating, the adsorbed component is introduced into a gas chromatograph with a hydrogen flame ionization detector (FID).
analysis.
3 reagents and materials
Analytical purification reagents that meet national standards were used for analysis unless otherwise stated.
3.1 Methanol. chromatographically pure.
3.2 Standard stock solution. Take appropriate amount of chromatographically pure benzene, toluene, ethylbenzene, o-xylene, m-xylene, p-xylene, cumene and phenylethyl
The alkene is formulated in a volume of methanol (3.1). A certified standard solution can also be used.
3.3 Carrier gas. nitrogen, purity 99.999%, purified with a purification tube.
3.4 Combustion gas. hydrogen, purity 99.99%.
3.5 Gas. Air, cleaned with a clean tube.
4 Instruments and equipment
4.1 Gas Chromatograph. equipped with FID detector.
4.2 Column
4.2.1 Packed column. made of hard glass or stainless steel, 2 m long, inner diameter 3 to 4 mm, filled with 2.5% phthalic acid diterpene
Chromsorb G·DMCS (80-100 mesh) of ester (DNP) and 2.5% bentonite-34 (bentane). See the preparation method of packed column
Appendix A.
4.2.2 Capillary column. The fixing solution is polyethylene glycol (PEG-20M), 30 m × 0.32 mm, film thickness 1.00 μm or equivalent capillary column.
4.3 Thermal desorption device
It has a first-level desorption or secondary desorption function, and can be purchased by professional manufacturers or by themselves. The thermal desorption unit can continuously adjust the temperature, the highest
The temperature can reach 300 ° C, and the temperature can be kept constant when the temperature reaches the set value. After the sampling tube is mounted on the thermal desorber, both ends of the sampling tube and
The entire system is not leaking. The temperature of the transmission line connected to the gas chromatograph should be maintained above 100 °C.
Thermal desorbers with freeze focus are also suitable for this standard.
4.4 aging device
The temperature is controllable at.200-400 ° C while maintaining a certain nitrogen flow rate.
4.5 Sample collection device
Oil-free sampling pump, flow rate range of 0.01 ~ 0.1 L/min and 0.1 ~ 0.5 L/mim, flow stability.
4.6 sampling tube
The material of the sampling tube is stainless steel or hard glass, filled with not less than.200 mg of Tenax (60-80 mesh) adsorbent (or other etc.)
The adsorbent is fixed at both ends with a stainless steel mesh or quartz wool having a pore smaller than the particle size of the adsorbent to prevent the adsorbent from falling. The position of the adsorbent in the tube
Set at least 15 mm from the inlet end of the tube and the length of the adsorbent should not exceed the size of the heated zone. The sampling tube can be purchased directly or it can be
Fill in.
4.7 Thermometer. Accuracy 0.1 °C.
4.8 Barometer. Accuracy of 0.01 kPa.
4.9 Microsampler. 1 ~ 5 μl.
4.10 Common instruments and equipment used in general laboratories.
5 samples
5.1 Preparation of sampling tube
The newly filled sampling tube is aged with an aging device or a thermal desorber with aging function, the aging flow rate is 50 ml/min, and the temperature is
350 ° C, time is 120 min; used sampling tube should be aged at 350 ° C for more than 30 min. Both ends of the sampling tube after aging are used immediately
The Teflon cap is sealed and stored in a sealed bag or protective tube. The sealed bag or protective tube is stored in a box or dryer equipped with activated carbon.
Store at 4 ° C. The aging tube should be used within two weeks.
5.2 Sample Collection
5.2.1 The sampler should be calibrated before sampling. At the sampling site, connect a sampling tube to the air sampling device to adjust the sampling.
Device flow, this sampling tube is only used to adjust the flow, no sampling analysis.
5.2.2 At room temperature, remove the PTFE cap on both sides of the aging tube and connect it to the sampler according to the flow direction on the sampling tube.
Check the air tightness of the sampling system. The air was collected at a flow rate of 10 to.200 ml/min for 10 to 20 minutes. If the scene contains more particles in the atmosphere
The filter head can be connected in front of the sampling tube. Record sampler flow, current temperature, and air pressure simultaneously. At 20 ° C, the components of the benzene series are filled
There is a safe sampling volume in a.200 mg Tenax-TA adsorption tube, see Appendix B.
5.2.3 Before sampling is completed, record the sampling flow again, take off the sampling tube, and immediately seal with a Teflon cap.
5.3 Sample storage
Immediately after sampling the sampling tube, the ends of the sampling tube were sealed with a Teflon cap, sealed at 4 ° C in the dark, and analyzed within 30 days.
5.4 Collection of blank samples on site
Transport the aged sampling tube to the sampling site, remove the Teflon cap and reseal it, do not participate in sample collection, and have collected
The sample tube is stored together. At least one blank sample of the field should be collected each time the sample is taken.
6 Analysis steps
6.1 Instrument selection
6.1.1 When the selected thermal desorption device has only one-stage desorption function, a gas chromatograph with a packed column should be used.
6.1.2 When the selected thermal desorption device has a secondary desorption function, a gas chromatograph with a capillary column should be used.
When a capillary column is selected, the inner diameter of the capillary column is selected based on the recommended thermal desorption flow rate of the secondary desorption focus tube. In general, the focus tube
It is recommended to use a capillary column with a 0.25 mm inner diameter when the thermal desorption flow rate is less than 2.0 ml/min; when the focus tube recommends a thermal desorption flow greater than
For 2.0 ml/min, a capillary column with an inner diameter of 0.32 mm or more can be used. The fixative is polyethylene glycol and the capillary has a thickness greater than 1.0 μm.
Column (4.2.2) has a good separation of the target components of this standard.
6.2 Recommended analysis conditions
6.2.1 Primary thermal desorption, packed column gas chromatography reference conditions
6.2.1.1 Thermal Desorber
Carrier gas flow rate. 50 ml/min; valve temperature. 100 ° C; transmission line temperature. 150 ° C; desorption temperature. 250 ° C; desorption time. 3 min.
6.2.1.2 packed column gas chromatography
Carrier gas flow rate. 50 ml/min; inlet temperature. 150 ° C; detector temperature. 150 ° C; column temperature. 65 ° C; hydrogen flow. 40 ml/min;
Air flow. 400 ml/min.
6.2.2 Secondary thermal desorption, capillary column gas chromatography reference conditions
6.2.2.1 Thermal Desorber
Initial sampling tube temperature. 40 ° C; initial temperature of focusing tube. 40 ° C; dry blowing temperature. 40 ° C; dry blowing time. 2 min;
With temperature. 250 ° C; sampling tube desorption time. 3 min; sampling tube desorption flow. 30 ml/min; focusing tube desorption temperature. 250 ° C;
The desorption time of the coke tube was 3 min; the temperature of the transmission line was 150 °C.
6.2.2.2 Capillary column gas chromatography
Oven temperature. 80 ° C constant temperature; column flow rate. 3.0 m/min; inlet temperature. 150 ° C; detector temperature. 250 ° C;
Amount. 30 ml/min; hydrogen flow. 40 ml/min; air flow. 400 ml/min.
6.3 Calibration
6.3.1 Calibration curve drawing
Take appropriate amount of standard stock solution (3.2), dilute with methanol (3.1) and dilute to 1.00 ml, the mass concentration is 5,
Calibration series of 10, 20, 50 and 100 μg/ml.
Connect the aged sample tube to the packed column inlet of another gas chromatograph, or similar to the GC packed column inlet function
Self-made device, set the inlet (device) temperature to 50 ° C, use a syringe to inject 1.0 μl standard series solution, use a flow of 100 ml/min
Pass the carrier gas (3.3) for 5 min, quickly remove the sampling tube, and seal the ends of the sampling tube with a Teflon cap to obtain 5, 10, 20, 50 and
100 ng calibration curve series sampling tube. Connect the calibration curve series sampling tube to the thermal desorption instrument in the opposite direction of the airflow when adsorbing the standard solution.
Analysis, drawing a calibration curve based on the target component mass and response value.
Note. If the thermal desorber has a liquid standard substance inlet, a certain amount of standard solution can be directly injected to calibrate the curve.
6.3.2 Standard chromatogram
6.3.2.1 Filled column reference chromatogram, see Figure 1.
1-Benzene; 2-toluene; 3-ethylbenzene; 4-p-xylene; 5-m-xylene; 6-o-xylene; 7-isopropylbenzene; 8-styrene.
Figure 1 Filled column chromatogram
6.3.2.2 Capillary column reference chromatogram, see Figure 2.
1-Benzene; 2-toluene; 3-ethylbenzene; 4-p-xylene; 5-m-xylene; 6-isopropylbenzene; 7-o-xylene; 8-styrene.
Figure 2 Capillary column chromatogram
6.4 Determination
The sample sampling tube is mounted on the thermal desorber, and the direction of the carrier gas flow in the sample tube is opposite to the direction of sampling, and the analysis conditions are adjusted.
(6.2), after the target component is desorbed, it is separated by gas chromatography and detected by FID. Record the retention time and corresponding values of the chromatographic peaks.
6.4.1 Qualitative analysis
Qualified according to retention time.
6.4.2 Quantitative analysis
The content of the target component is calculated based on the calibration curve.
6.5 Blank test
The blank tube on site is measured in the same batch as the sample tube that has been sampled, and the analysis steps are the same as in the measurement (6.4).
7 Calculation and representation of results
7.1 The concentration of the target compound in the gas is calculated according to formula (1).
Nd 1 000
WW
ρ −= × (1)
Where. ρ--the mass concentration of the component to be tested in the gas, mg/m3;
W--thermal desorption injection, the mass of the measured component calculated from the calibration curve, ng;
W0--the mass of the component to be tested in the blank tube calculated from the calibration curve, ng;
Vnd - the sampling volume in the standard state (101.325 kPa, 273.15 K), L.
7.2 Results representation
When the measurement result is less than 0.1 mg/m3, it is retained to four decimal places; when it is 0.1 mg/m3 or more, three significant figures are retained.
8 precision and accuracy
8.1 Precision
Packed Column Gas Chromatography. Five laboratories measured uniform samples at 1.0 ng and 50.0 ng, respectively, in the laboratory.
The relative standard deviation range is 0.6%~2.3%, 0.4%~2.7%, and the relative standard deviation between laboratories ranges from 0.6% to 1.5%, 0.3%~
0.7%, the repeatability limit ranged from 0.04 to 0.05 ng, 1.91 to 2.81 ng, and the reproducibility range was 0.04 to 0.06 ng, 2.03 to 2.81 ng.
See Appendix C for detailed parameters.
Capillary Column Gas Chromatography. Five laboratories measured uniform samples at 1.0 ng and 50.0 ng, respectively.
The internal relative standard deviation range is 0.8% to 2.3%, 0.8% to 2.7%, and the relative standard deviation between laboratories ranges from 0.8% to 2.3%, 0.6%.
1.5%; reproducibility limits range from 0.03 to 0.06 ng, 1.72 to 2.94 ng, and reproducibility limits range from 0.04 to 0.07 ng, 1.72 to 3.12 ng.
See Appendix C for detailed parameters.
8.2 Accuracy
Five laboratories tested two standard samples of mass concentration, and the final value of the relative error of packed column gas chromatography was
−0.8%~2.6%, the final value of the spiked recovery range is 92.1%~106%; the final value of the relative error of capillary column gas chromatography is
−1.0%~3.5%, the final value of the spiked recovery rate ranges from 93.4% to 106%. See Appendix C for detailed parameters.
9 Quality Assurance and Quality Control
9.1 Main contamination of sample residues from the Tenax sampling tube. The sampling tube should be fully aged before sampling to remove sample residue. The residual amount should be
Less than 1/4 of the lowest point of the calibration curve. The sampling tube should be kept in a closed state during transportation and storage.
9.2 The residual amount of the target compound in the blank sample should be less than 1/4 of the sample. When the data is suspicious, this batch of data should be verified and
an examination.
9.3 The relative deviation of the flow before and after sampling should be within 10%.
9.4 At least one set of parallel samples shall be collected for each batch of samples. The parallel sample collection flow rate is 20% to 40% of the sample collection flow rate.
with. The relative deviation of the detected amount of the target compound in the parallel sample should be less than 25%, otherwise the sample sampling flow should be reduced. Such as reducing the flow rate
The relative deviation is still greater than 25% and the sampling tube should be replaced or the sampling tube refilled.
9.5 Collect at least one second sampling tube per batch of sample. The second sampling tube should be connected in series after the sample sampling tube, and the target compound detection amount should be
It is less than 20% of the detection amount of the target compound in the sample sampling tube. Otherwise, the sampling tube should be replaced or the sampling volume should be reduced.
9.6 Each batch of samples should be analyzed with an intermediate concentration check point. The measured value of the intermediate concentration check point is relative to the concentration of the corresponding point of the calibration curve.
The error should not exceed 20%. If the allowable range is exceeded, the intermediate concentration point standard solution should be reconstituted. If it is not enough, it should be re-established.
Draw a calibration curve.
Appendix A
(informative appendix)
Filling method of packed column
Weighed 0.525 g of organic bentonite and 0.378 g of DNP, placed in a round bottom flask, added 60 ml of benzene, and refluxed for 3 h in a 90 ° C water bath.
After adding 15 g of Chromsorb G·DMCS carrier and refluxing for 2 h, the stationary phase was transferred to a Petri dish and baked under an infrared lamp.
Shake it to a loose state, and then let it stand for 2 hours.
The end of the column (connected to the detector end) is plugged with quartz wool, connected to a vacuum pump, and the other end of the column is connected to a funnel through a hose.
After the vacuum pump, slowly put the stationary phase into the column through the funnel, tap the column to make the filling evenly, and after filling, use quartz.
Cotton is plugged into the other end of the column.
The packed column should be passed through the carrier gas at a low flow rate of 20 to 30 ml/min at 150 ° C for 24 h.
Appendix B
(informative appendix)
Safe sampling volume of benzene series
The safe sampling volume of each component of the benzene series in a.200 mg Tenax-TA adsorption tube at 20 ° C is shown in Table B.1.
Table B.1 Safe sampling volume of benzene series
Component safe sampling volume/L
Benzene 6.2
Toluene 38
Ethylbenzene 180
Xylene 300
Cumene 480
Styrene 300
Appendix C
(informative appendix)
Precision and Accuracy Summary
Schedule C.1 Filled Column Gas Chromatography Precision and Accuracy
Component
index
Blank scalar /
Ng
Repeatability limit r/
Ng
Reproducibility limit R/
Ng
Laboratory room
The relative standard deviation/
Laboratory room
The relative standard deviation/
standard material/
(mg/L)
Relative error
Final value
2 RERE S±
Sample spike recovery
Final value
2 PP S±
1.0 0.05 0.05 0.6~2.1 1.1 161±12 0.54±0.68
97.6±3.4
50.0 2.49 2.31 1.6~1.8 0.3 233±14 0.56±0.65
Toluene
1.0 0.04 0.05 0.9~2.3 1.3 162±9 0.74±0.47
97.4±1.3
50.0 2.35 2.35 0.4~2.7 0.3 239±11 0.70±0.24
Ethylbenzene
1.0 0.04 0.05 0.6~2.3 1.1 163±10 1.19±0.92
100±3.8
50.0 2.78 2.78 1.6~2.7 0.6 239±11 0.67±0.83
Paraxylene
1.0 0.04 0.04 0.6~1.9 0.6 163±10 1.31±1.32
96.7±4.8
50.0 2.63 2.63 1.6~2.2 0.5 237±10 0.59±1.41
Meta-xylene
1.0 0.05 0.06 1.3~2.1 1.5 162±11 0.58±0.37
98.2±3.0
50.0 2.51 2.52 0.8~2.7 0.6 237±10 0.49±1.35
O-xylene
1.0 0.05 0.06 0.9~2.3 1.8 161±10 0.23±0.45
98.2±3.4
50.0 2.81 2.81 1.6~2.7 0.7 237±10 0.28±0.43
Cumene
1.0 0.04 0.05 0.9~2.1 1.4 162±11 0.47±0.61
101±5.3
50.0 2.28 2.28 0.4~2.2 0.6 237±11 0.79±0.43
Styrene
1.0 0.04 0.06 0.9 to 2.3 1.5.200 0.92 ± 1.18
99.9±6.9
50.0 1.91 2.03 0.4~1.8 0.7 400 0.66±0.45
Table C.2 Capillary Column Gas Chromatography Precision and Accuracy
Component
index
Blank scalar /
Ng
Repeatability limit r/
Ng
Reproducibility limit R/
Ng
Laboratory room
The relative standard deviation/
Laboratory room
The relative standard deviation/
standard material/
(mg/L)
Relative error
Final value
2 RERE S±
Sample spike recovery
Final value
2 PP S±
1.0 0.04 0.07 0.8 to 2.3 2.0 161±12 0.54±0.91
98.0±2.7
50.0 2.07 2.23 08.~2.7 0.8 233±14 0.80±1.04
Toluene
1.0 0.04 0.06 0.8~2.0 1.8 162±9 0.86±0.71
98.6±3.8
50.0 2.76 2.79 1.4~2.5 0.8 239±11 0.82±0.25
Ethylbenzene
1.0 0.05 0.06 0.9~2.3 1.4 163±10 1.23±0.84
99.9±2.9
50.0 2.30 2.30 1.2~1.7 0.6 239±11 0.68±0.81
Paraxylene
1.0 0.03 0.04 0.9 to 1.6 1.1 163±10 1.21±0.97
96.7±3.3
50.0 2.94 2.94 1.4~2.5 0.8 237±10 0.58±0.99
Meta-xylene
1.0 0.06 0.08 0.9~2.3 1.8 162±11 0.51±0.14
98.2 ± 3.9
50.0 1.74 2.28 0.9 to 1.4 1.2 237±10 0.52±1.56
O-xylene
1.0 0.06 0.06 0.8~2.1 0.8 161±10 0.31±0.88
97.8±4.0
50.0 1.72 1.72 1.0~1.6 0.4 237±10 0.13±0.35
Cumene
1.0 0.04 0.06 0.9~2.1 2.3 162±11 0.41±0.41
99.1±7.0
50.0 2.33 2.33 1.0~1.9 0.3 237±11 0.53±0.53
Styrene
1.0 0.05 0.07 1.3~2.3 1.9.200 1.67±1.81
99.5±7.1
50.0 2.54 3.12 0.8~2.5 1.5 400 0.64±0.54
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