HJ 584-2010_English: PDF (HJ584-2010)
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Ambient air. Determination of benzene and its analogies by activated charcoal adsorption carbon disulfide desorption and gas chromatography
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HJ 584-2010
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Standards related to: HJ 584-2010
| Standard ID | HJ 584-2010 (HJ584-2010) | | Description (Translated English) | Ambient air. Determination of benzene and its analogies by activated charcoal adsorption carbon disulfide 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Count Estimation | 14,120 | | Date of Issue | 2010-09-20 | | Date of Implementation | 2010-12-01 | | Older Standard (superseded by this standard) | GB/T 14670-1993 | | Drafting Organization | Dalian Municipal Environmental Monitoring Center | | Administrative Organization | Ministry of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 activated carbon adsorption/desorption of carbon disulfide 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 room temperature, low humidity exhaust BTEX determination. | HJ 584-2010
HJ
NATIONAL ENVIRONMENTAL PROTECTION
STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA
Replacing GB/T 14670-1993
Ambient Air – Determination of Benzene and Its Analogies
by Activated Charcoal Adsorption Carbon Disulfide
Desorption and Gas Chromatography
ISSUED ON: SEPTEMBER 20, 2010
IMPLEMENTED ON: DECEMBER 01, 2010
Issued by: Ministry of Environmental Protection
Table of Contents
Foreword ... 5
1 Scope of Application ... 7
2 Method Principle ... 7
3 Interference and Cancellation ... 7
4 Reagents and Materials ... 8
5 Apparatus ... 8
6 Samples ... 9
7 Analysis Procedures ... 10
8 Calculation and Representation of Results ... 12
9 Precision and Accuracy ... 12
10 Quality Assurance and Quality Control ... 13
Appendix A (Informative) Purification of Carbon Disulfide ... 15
Appendix B (Informative) Packing Method of Packed Column ... 16
Appendix C (Informative) Summary Table of Precision and Accuracy ... 17
Ambient Air – Determination of Benzene and Its Analogies
by Activated Charcoal Adsorption Carbon Disulfide
Desorption and Gas Chromatography
1 Scope of Application
This Standard specifies using the activated charcoal adsorption/carbon disulfide
desorption-gas chromatography method for the determination of benzene and its
analogies in the air.
This Standard is applicable to the determination of benzene, toluene, ethylbenzene, o-
xylene, m-xylene, p-xylene, cumene and styrene in ambient air and indoor air. This
standard is also applicable to the determination of benzene and its analogies in low-
humidity exhaust gas at room temperature.
When the sampling volume is 10L, the method detection limits of benzene, toluene,
ethylbenzene, o-xylene, m-xylene, p-xylene, cumene and styrene are all 1.5×10−3
mg/m3, and the lower limit of determination is 6.0×10−3 mg/m3.
2 Method Principle
Use the activated charcoal sampling tube to enrich the benzene and its analogies in
ambient air and indoor air; carbon disulfide (CS2) is desorbed; and use the gas
chromatograph with hydrogen flame ionization detector (FID) for determination and
analysis.
3 Interference and Cancellation
The main interference comes from the impurities of carbon disulfide. Carbon disulfide
shall be identified by gas chromatograph for the presence of interference peaks before
use. If there are interference peaks, carbon disulfide shall be purified. See Appendix A
for the purification method.
6.3 Storage of samples
After collecting the sample, immediately seal the two ends of the activated charcoal
sampling tube with a Teflon cap; and store it in a tightly sealed manner in the dark; and
measure it within 8h at room temperature. Otherwise, put it in an airtight container and
store in a refrigerator at −20°C; the shelf life is 1d.
6.4 Desorption of the sample
Take out Section-A and Section-B of the activated charcoal sampling tube and put
them into the ground test tube with stopper. Add 1.00mL of carbon disulfide (4.1) to
each test tube and seal it; shake it gently; and desorb at room temperature for 1h
before testing.
7 Analysis Procedures
7.1 Recommended analysis conditions
7.1.1 Reference conditions of packed column gas chromatography
Carrier gas flow rate: 50mL/min; inlet temperature: 150°C; detector temperature:
150°C; column temperature: 65°C; hydrogen flow rate: 40mL/min; air flow rate: 400
mL/min.
7.1.2 Reference conditions for capillary column gas chromatography
Column and oven temperature: keep at 65°C for 10min; heating at a rate of 5°C/min
to 90°C, and keep it for 2min. Column flow rate: 2.6mL/min; inlet temperature: 150°C;
detector temperature: 250°C; makeup gas flow rate: 30mL/min; hydrogen flow rate: 40
mL/min; air flow rate: 400mL/min.
7.2 Calibration
7.2.1 Drawing of calibration curve
Take an appropriate amount of standard stock solution (4.2) and dilute it into 1.00mL
of carbon disulfide (4.1) to prepare calibration series with mass concentrations of 0.5,
1.0, 10, 20, and 50μg/mL. Take 1.0μL of the standard series solution and inject it into
the injection port of gas chromatograph. Draw a calibration curve based on the mass
and response value of each target component.
7.2.2 Standard chromatogram
7.2.2.1 Refer to the chromatogram for the capillary column, see Figure 2.
Calculate the target component content according to the calibration curve.
7.4 Blank test
The on-site blank activated charcoal tube is measured in the same batch as the sample
tube that has been sampled, and the analysis procedure is the same as the
measurement (7.3).
8 Calculation and Representation of Results
8.1 The concentration of the target compound in the gas is calculated according to
Formula (1).
Where:
ρ – mass concentration of tested components in the gas, in mg/m3;
W - mass concentration of the sample desorption solution calculated from the
calibration curve, in µg/mL;
W0 - mass concentration of the blank desorption solution calculated from the calibration
curve, in µg/mL;
V – volume of desorption solution, in mL;
Vnd – sampling volume in the standard state (101.325kPa, 273.15K), in L.
8.2 Representation of results
When the measurement result is less than 0.1mg/m3, it is retained to four digits after
the decimal point; when it is greater than or equal to 0.1mg/m3, three significant digits
shall be retained.
9 Precision and Accuracy
9.1 Precision
Capillary column gas chromatography: Five laboratories respectively measure uniform
samples with a content of 0.5μg and 50.0μg. The relative standard deviations in the
laboratory range from 1.1% to 2.6% and 1.1% to 2.5%, respectively. The relative
standard deviations among the laboratories range from 0.2% to 1.0%, and 0.1% to
1.0%; the repeatability limits range from 0.01 to 0.03μg, and 1.95 to 3.27μg; and the
reproducibility limits range from 0.02 to 0.04μg, and 1.95 to 3.32μg. See Appendix C
for detailed parameters.
Packed column gas chromatography: Five laboratories respectively measured uniform
samples with a content of 0.5μg and 50.0μg. The relative standard deviations in the
laboratory range from 1.1% to 2.6% and 1.1% to 3.7%, respectively. The relative
standard deviations among the laboratories range from 0.1% to 0.7%, and 0.3% to
1.0%; the repeatability limits range from 0.02 to 0.03μg, and 2.10 to 3.06μg; and the
reproducibility limits range from 0.02 to 0.03μg, and 2.12 to 3.06μg. See Appendix C
for detailed parameters.
9.2 Accuracy
Five laboratories measure two concentrations of standard samples. The spiked
amount of each component is 100μg. The final relative error value of capillary column
gas chromatography ranges from −2.6% to 11.6%. The final spiked recovery rate value
ranges from 92.2% to 105%; the final relative error value of the packed column gas
chromatography ranges from −1.2% to 6.0%; and the final spiked recovery rate value
ranges from 92.9% to 104%. See Appendix C for detailed parameters.
10 Quality Assurance and Quality Control
10.1 When the water vapor or water mist in the air is too large to condense in the
activated charcoal tube, it shall influence the penetration volume and sampling
efficiency of the activated charcoal tube, and the air humidity shall be less than 90%.
10.2 The relative deviation of the flow rate before and after sampling shall be within
10%.
10.3 The adsorption efficiency of the activated charcoal sampling tube shall be above
80%, that is, the components collected by the activated charcoal in the Section-B shall
be less than 25% of the Section-A; otherwise, the flow rate or sampling time shall be
adjusted, and the sampling shall be repeated. Calculate the adsorption efficiency (%)
of activated charcoal tube according to Formula (2):
Where:
K – absorption efficiency of sampling, in %;
M1 – the sampling amount in Section-A, in ng;
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