GB/T 39193-2020 English PDF (GBT39193-2020)
GB/T 39193-2020 English PDF (GBT39193-2020)
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GB/T 39193-2020: Ambient air -- Determination of particulate matter mass concentration -- Gravimetric method
GB/T 39193-2020
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 19.120
A 28
Ambient air - Determination of particulate matter mass
concentration - Gravimetric method
ISSUED ON: OCTOBER 11, 2020
IMPLEMENTED ON: MAY 01, 2021
Issued by: State Administration for Market Regulation;
Standardization Administration of the PRC.
Table of Contents
Foreword ... 3
Introduction ... 4
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions ... 5
4 Principle and method ... 6
5 Instruments and equipment... 6
6 Sampling and weighing ... 8
7 Calculation and presentation of results ... 10
8 Uncertainty evaluation of measurement results ... 11
9 Quality control and quality assurance ... 12
Appendix A (Normative) Method for checking air tightness of sampler ... 15
Appendix B (Normative) Method for checking flow rate of sampler ... 17
Appendix C (Informative) Example of uncertainty evaluation for measurement
of particulate matter mass concentration ... 19
Bibliography ... 23
Ambient air - Determination of particulate matter mass
concentration - Gravimetric method
1 Scope
This Standard specifies the method of filter membrane sampling and weighing
for the determination of particulate matter in ambient air, including principle and
method, instruments and equipment, sampling and weighing, calculation and
presentation of results, uncertainty evaluation of measurement results, quality
control and quality assurance.
This Standard applies to the use of filter membrane weighing method to
measure the particulate matter mass concentration in ambient air.
2 Normative references
The following documents are indispensable for the application of this document.
For the dated references, only the editions with the dates indicated are
applicable to this document. For the undated references, the latest edition
(including all the amendments) are applicable to this document.
GB/T 4883 Statistical interpretation of data - Detection and treatment of
outliers in the normal sample
GB/T 8170 Rules of rounding off for numerical values and expression and
judgement of limiting values
GB/T 26497 Electronic balance
JJF 1059.1 Evaluation and Expression of Uncertainty in Measurement
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
Particulate matter; PM
The particulate matter in ambient air.
Medium-flow flowmeter: Range is 50 L/min~800 L/min; maximum allowable
error: ±2%;
Small-flow flowmeter: less than 50 L/min; maximum allowable error: ±2%.
5.4 Standard thermometer
It is used to measure the ambient temperature and calibrate the temperature
measurement parts of the sampler and constant-temperature and -humidity
equipment. The measurement range is -30 °C~50 °C. The maximum allowable
error is ±0.5 °C.
5.5 Standard hygrometer
It is used to measure the ambient humidity and calibrate the humidity
measurement parts of the constant-temperature and -humidity equipment.
Measurement range: relative humidity 40%~60%; maximum allowable error:
±2%.
5.6 Standard barometer
It is used to measure the atmospheric pressure of the environment and calibrate
the atmospheric pressure measurement parts of the sampler. Measurement
range: 50 kPa~107 kPa; maximum allowable error: ±0.25 kPa.
5.7 Standard stopwatch
It is used to check the timing parts of the sampler. Division value: 0.01 s.
5.8 Electronic balance
It is used for filter membrane weighing. According to the sampling volume and
filter membrane mass, an electronic balance with an appropriate weighing
range and division value shall be selected. Generally, the sampling mass shall
be greater than 100 times the division value of the electronic balance. The
division value of the electronic balance shall not be greater than 0.01 mg. The
technical performance shall meet the requirements of GB/T 26497.
The electronic balance shall be placed in an environment with the same
temperature and humidity control conditions as the constant-temperature and -
humidity equipment.
5.9 Constant-temperature and -humidity equipment
It is used to balance the temperature and humidity of the filter membrane before
and after sampling. Temperature control range: 15 °C~30 °C; temperature
fluctuation: ±1 °C. Relative humidity control range: relative humidity 45%~55%.
temperature indication error exceeds this range, the sampler shall be calibrated
for temperature.
6.1.6 Sampler atmospheric pressure measurement check and calibration
The standard barometer shall be used regularly to check the atmospheric
pressure indication error of the sampler. The maximum allowable error is ±1
kPa. If the indication error exceeds this range, pressure calibration shall be
performed on the sampler.
6.1.7 Temperature and humidity control check of constant-temperature
and -humidity equipment
Standard thermometers and standard hygrometers shall be used regularly, to
check the temperature and humidity indication errors and the temperature and
humidity fluctuation ranges of the constant-temperature and -humidity
equipment, to ensure that the constant-temperature and -humidity conditions
meet the requirements in 5.9.
6.1.8 Filter membrane check
The filter membrane shall have flat edges, uniform thickness, no burrs, no
pollution on the surface, no pinholes or damage.
6.2 Filter membrane balance and weighing before sampling
PLACE the uniquely-identified filter membrane in a constant-temperature and -
humidity equipment to balance for at least 24 h. RECORD the equilibrium
temperature and humidity of the filter membrane. USE a balance to weigh the
filter membrane and record the mass and number of the filter membrane.
After the first weighing, place it under the same equilibrium conditions for at
least 1 h before weighing again. The difference between the two weighed
masses of the same filter membrane shall not exceed ±40 μg (for medium-flow
or small-flow samplers) or ±0.4 mg (for large-flow samplers). If it exceeds this
range, the filter membrane is invalid. TAKE the average of the two weighing
results as the mass of the filter membrane.
6.3 Sampling operation
In a clean environment, use tweezers to put the weighed filter membrane into
the filter membrane holder. The rough surface of the filter membrane shall face
the direction of air intake. PUT the filter membrane holder into the sampler; SET
the parameters such as sampling time; START the sampler for sampling.
After sampling, put the filter membrane in a sealed, independent storage box;
8.3 Expanded uncertainty
The expanded uncertainty of the measurement result is calculated according to
formula (3).
Where:
U - The expanded uncertainty, in micrograms per cubic meter (μg/m3);
k - Coverage factor, generally k=2;
uc - The combined standard uncertainty, in micrograms per cubic meter (μg/m3).
9 Quality control and quality assurance
9.1 Management of instruments and equipment
It shall establish an instrument and equipment management system. The
instruments and equipment used in the operation shall be verified, calibrated
and maintained in accordance with the specified cycle.
9.2 Sampling process quality control
The sampler shall be placed and installed in accordance with relevant
regulations. Multiple samplers, installed at the same sampling point, shall meet
the corresponding spacing requirements. The exhaust of the sampler shall not
Get QUOTATION in 1-minute: Click GB/T 39193-2020
Historical versions: GB/T 39193-2020
Preview True-PDF (Reload/Scroll if blank)
GB/T 39193-2020: Ambient air -- Determination of particulate matter mass concentration -- Gravimetric method
GB/T 39193-2020
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 19.120
A 28
Ambient air - Determination of particulate matter mass
concentration - Gravimetric method
ISSUED ON: OCTOBER 11, 2020
IMPLEMENTED ON: MAY 01, 2021
Issued by: State Administration for Market Regulation;
Standardization Administration of the PRC.
Table of Contents
Foreword ... 3
Introduction ... 4
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions ... 5
4 Principle and method ... 6
5 Instruments and equipment... 6
6 Sampling and weighing ... 8
7 Calculation and presentation of results ... 10
8 Uncertainty evaluation of measurement results ... 11
9 Quality control and quality assurance ... 12
Appendix A (Normative) Method for checking air tightness of sampler ... 15
Appendix B (Normative) Method for checking flow rate of sampler ... 17
Appendix C (Informative) Example of uncertainty evaluation for measurement
of particulate matter mass concentration ... 19
Bibliography ... 23
Ambient air - Determination of particulate matter mass
concentration - Gravimetric method
1 Scope
This Standard specifies the method of filter membrane sampling and weighing
for the determination of particulate matter in ambient air, including principle and
method, instruments and equipment, sampling and weighing, calculation and
presentation of results, uncertainty evaluation of measurement results, quality
control and quality assurance.
This Standard applies to the use of filter membrane weighing method to
measure the particulate matter mass concentration in ambient air.
2 Normative references
The following documents are indispensable for the application of this document.
For the dated references, only the editions with the dates indicated are
applicable to this document. For the undated references, the latest edition
(including all the amendments) are applicable to this document.
GB/T 4883 Statistical interpretation of data - Detection and treatment of
outliers in the normal sample
GB/T 8170 Rules of rounding off for numerical values and expression and
judgement of limiting values
GB/T 26497 Electronic balance
JJF 1059.1 Evaluation and Expression of Uncertainty in Measurement
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
Particulate matter; PM
The particulate matter in ambient air.
Medium-flow flowmeter: Range is 50 L/min~800 L/min; maximum allowable
error: ±2%;
Small-flow flowmeter: less than 50 L/min; maximum allowable error: ±2%.
5.4 Standard thermometer
It is used to measure the ambient temperature and calibrate the temperature
measurement parts of the sampler and constant-temperature and -humidity
equipment. The measurement range is -30 °C~50 °C. The maximum allowable
error is ±0.5 °C.
5.5 Standard hygrometer
It is used to measure the ambient humidity and calibrate the humidity
measurement parts of the constant-temperature and -humidity equipment.
Measurement range: relative humidity 40%~60%; maximum allowable error:
±2%.
5.6 Standard barometer
It is used to measure the atmospheric pressure of the environment and calibrate
the atmospheric pressure measurement parts of the sampler. Measurement
range: 50 kPa~107 kPa; maximum allowable error: ±0.25 kPa.
5.7 Standard stopwatch
It is used to check the timing parts of the sampler. Division value: 0.01 s.
5.8 Electronic balance
It is used for filter membrane weighing. According to the sampling volume and
filter membrane mass, an electronic balance with an appropriate weighing
range and division value shall be selected. Generally, the sampling mass shall
be greater than 100 times the division value of the electronic balance. The
division value of the electronic balance shall not be greater than 0.01 mg. The
technical performance shall meet the requirements of GB/T 26497.
The electronic balance shall be placed in an environment with the same
temperature and humidity control conditions as the constant-temperature and -
humidity equipment.
5.9 Constant-temperature and -humidity equipment
It is used to balance the temperature and humidity of the filter membrane before
and after sampling. Temperature control range: 15 °C~30 °C; temperature
fluctuation: ±1 °C. Relative humidity control range: relative humidity 45%~55%.
temperature indication error exceeds this range, the sampler shall be calibrated
for temperature.
6.1.6 Sampler atmospheric pressure measurement check and calibration
The standard barometer shall be used regularly to check the atmospheric
pressure indication error of the sampler. The maximum allowable error is ±1
kPa. If the indication error exceeds this range, pressure calibration shall be
performed on the sampler.
6.1.7 Temperature and humidity control check of constant-temperature
and -humidity equipment
Standard thermometers and standard hygrometers shall be used regularly, to
check the temperature and humidity indication errors and the temperature and
humidity fluctuation ranges of the constant-temperature and -humidity
equipment, to ensure that the constant-temperature and -humidity conditions
meet the requirements in 5.9.
6.1.8 Filter membrane check
The filter membrane shall have flat edges, uniform thickness, no burrs, no
pollution on the surface, no pinholes or damage.
6.2 Filter membrane balance and weighing before sampling
PLACE the uniquely-identified filter membrane in a constant-temperature and -
humidity equipment to balance for at least 24 h. RECORD the equilibrium
temperature and humidity of the filter membrane. USE a balance to weigh the
filter membrane and record the mass and number of the filter membrane.
After the first weighing, place it under the same equilibrium conditions for at
least 1 h before weighing again. The difference between the two weighed
masses of the same filter membrane shall not exceed ±40 μg (for medium-flow
or small-flow samplers) or ±0.4 mg (for large-flow samplers). If it exceeds this
range, the filter membrane is invalid. TAKE the average of the two weighing
results as the mass of the filter membrane.
6.3 Sampling operation
In a clean environment, use tweezers to put the weighed filter membrane into
the filter membrane holder. The rough surface of the filter membrane shall face
the direction of air intake. PUT the filter membrane holder into the sampler; SET
the parameters such as sampling time; START the sampler for sampling.
After sampling, put the filter membrane in a sealed, independent storage box;
8.3 Expanded uncertainty
The expanded uncertainty of the measurement result is calculated according to
formula (3).
Where:
U - The expanded uncertainty, in micrograms per cubic meter (μg/m3);
k - Coverage factor, generally k=2;
uc - The combined standard uncertainty, in micrograms per cubic meter (μg/m3).
9 Quality control and quality assurance
9.1 Management of instruments and equipment
It shall establish an instrument and equipment management system. The
instruments and equipment used in the operation shall be verified, calibrated
and maintained in accordance with the specified cycle.
9.2 Sampling process quality control
The sampler shall be placed and installed in accordance with relevant
regulations. Multiple samplers, installed at the same sampling point, shall meet
the corresponding spacing requirements. The exhaust of the sampler shall not