HJ 1100-2020 English PDF

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HJ 1100-2020: Technical guide for automatic monitoring by beta ray method for particulate matter in ambient air (PM10 and PM2.5)
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Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
HJ 1100-2020	279	Add to Cart	3 days	Technical guide for automatic monitoring by beta ray method for particulate matter in ambient air (PM10 and PM2.5)	Valid

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Basic data

Standard ID: HJ 1100-2020 (HJ1100-2020)
Description (Translated English): Technical guide for automatic monitoring by beta ray method for particulate matter in ambient air (PM10 and PM2.5)
Sector / Industry: Environmental Protection Industry Standard
Word Count Estimation: 12,137
Date of Issue: 2020
Date of Implementation: 2020-04-12
Issuing agency(ies): Ministry of Ecology and Environment

HJ 1100-2020: Technical guide for automatic monitoring by beta ray method for particulate matter in ambient air (PM10 and PM2.5)

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Technical guide for automatic monitoring by beta ray method for particulate matter in ambient air (PM10 and PM2.5) National Environmental Protection Standards of the People's Republic of China Particulate matter in ambient air (PM10 and PM2.5) Automatic monitoring technology guide for β-ray method 2020-02-12 release 2020-04-12 Implementation Issued by the Ministry of Ecology and Environment

Table of contents

Foreword...ii 1 Scope of application...1 2 Normative references...1 3 Principles of the method...1 4 Interference and cancellation...2 5 Reagents and materials...2 6 Instruments and equipment...2 7 Analysis steps...2 8 Calculation and presentation of results...4 9 Precision and accuracy...5 10 Quality Assurance and Quality Control...5 11 Precautions...5 Appendix A (informative appendix) schematic diagram of the composition of different types of particulate matter instrument systems...6 Appendix B (informative appendix) Determination of detection limit...8

Foreword

To implement the Environmental Protection Law of the People’s Republic of China and the Air Pollution Prevention and Control Law of the People’s Republic of In order to protect human health, regulate the automatic determination method of particulate matter (PM10 and PM2.5) in the ambient air, and formulate this standard. This standard specifies the beta-ray method for the automatic determination of particulate matter (PM10 and PM2.5) in the ambient air. Appendix A and Appendix B of this standard are informative appendices. This standard is issued for the first time. This standard was formulated by the Department of Ecological Environment Monitoring and the Department of Regulations and Standards of the Ministry of Ecology and Environment. Drafting organization of this standard. Dalian Ecological Environment Monitoring Center, Liaoning Province. Verification unit of this standard. Guangzhou Environmental Monitoring Center Station, Harbin Environmental Monitoring Center Station, Ecological Environment of Liaoning Province Monitoring Center, Shenyang Ecological Environment Monitoring Center of Liaoning Province, Fushun City Environmental Monitoring Center Station and Yingkou City Environmental Monitoring Center Station. This standard was approved by the Ministry of Ecology and Environment on February 12, 2020. This standard will be implemented on April 12, 2020. This standard is interpreted by the Ministry of Ecology and Environment. Technical Guidelines for Automatic Monitoring of Particulate Matter (PM10 and PM2.5) in Ambient Air by β-ray Method

1 Scope of application

This standard specifies the beta-ray method for the automatic determination of particulate matter (PM10 and PM2.5) in the ambient air. This standard applies to the automatic determination of particulate matter (PM10 and PM2.5) in the ambient air. When the instrument range is 0 μg/m3～1000 μg/m3, the detection limit of this standard method is 1 μg/m3, and the lower limit of determination is 4 μg/m3. The mass concentration in this standard refers to the concentration in the actual state (atmospheric temperature and pressure during monitoring).

2 Normative references

This standard refers to the following documents or their clauses. For undated reference documents, their valid versions are applicable to this standard. HJ 93 Ambient air particulate matter (PM10 and PM2.5) sampler technical requirements and detection methods HJ 618 Determination of PM10 and PM2.5 in ambient air gravimetric method HJ 653 Technical requirements and detection methods for continuous automatic monitoring system of ambient air particulate matter (PM10 and PM2.5) HJ 655 Technical Specification for Installation and Acceptance of Ambient Air Particulate Matter (PM10 and PM2.5) Continuous Automatic Monitoring System HJ 656 Technical Specification for Manual Monitoring Method (Gravimetric Method) of Ambient Air Particulate Matter (PM2.5) HJ 663 Technical Specification for Environmental Air Quality Evaluation (Trial) HJ 817 Ambient air particulate matter (PM10 and PM2.5) continuous automatic monitoring system operation and quality control technical specifications

3 Principles of the method

The sample air passes through the sampling tube at a constant flow rate through the cutter, and particles are trapped on the filter belt. Beta rays pass through the filter band When the energy is attenuated, the mass of the particulate matter is calculated by measuring the attenuation.

4 Interference and elimination

4.1 The irregular spatial distribution of the β-ray electron flow or the uneven particle retention caused by the abrasion of the sampling system will cause A measurement error occurs. 4.2 The elemental composition and chemical composition of particulate matter have little effect on the absorption coefficient per unit mass k. 4.3 The radiation of particulate matter has little effect on beta rays. Some instruments can detect radon alpha emission value and subtract its production Beta-ray effects. 4.4 Humidity has a certain impact on the determination of particulate matter, and dynamic heating can be used to reduce the impact of humidity, but at the same time Control the heating power and heating temperature to reduce the loss of volatile organic compounds.

5 Reagents and materials

5.1 Filter belt (membrane). you can choose inorganic materials such as glass fiber material, quartz material, or polyvinyl chloride, polypropylene, polytetrafluoroethylene, etc. Organic materials such as vinyl fluoride and mixed cellulose. The filter belt (membrane) should have flat edges, uniform thickness, no burrs, no pollution, and no There must be pinholes or any damage. Under the specified membrane surface flow rate, the PM10 sampling filter belt (membrane) requires the interception of 0.3 μm particles Retention efficiency ≥99%, PM2.5 sampling filter belt (membrane) requires that the retention efficiency of 0.3 μm particulate matter is ≥99.7%. 5.2 Zero diaphragm. It is made of inert materials (such as polycarbonate, aluminum, gold, etc.), and has basically the same Area quality. 5.3 Standard film. made of inert materials (such as polycarbonate, aluminum, gold, etc.), divided into two types, one nominal value is actual Area mass, another nominal value is the difference between the actual area mass of the diaphragm minus the area mass of the zero diaphragm.

6 Apparatus and equipment

6.1 Beta Radiometer The measuring device should include a cutter, a sampling tube, a sealing device, a filter belt holder, a β-ray measurement system, and a flow control device. The flow control device should be able to control the sampling flow within the range of ±5% of the set value for parts such as setting, pump, flow meter or flow meter. Inside, see Appendix A for the schematic diagrams of different types of β-ray instrument systems. The performance index of the instrument should meet the requirements of HJ 653. Note. The sampling tube needs to be equipped with a dynamic heating device, and the heating temperature range is generally set between 40°C and 50°C according to actual conditions. 6.2 Balance The division value does not exceed 0.01 mg.

7 Analysis steps

7.1 Selection of cutter Choose a suitable cutter according to the measured particle size. When measuring PM10 and PM2.5, cutter performance refers to The standard shall comply with the geometric standard deviation requirements of HJ 93 regarding the trapping efficiency of the cutter. 7.2 Installation and commissioning of the instrument After the newly purchased instrument is installed, the parameters should be set according to the operation manual and commissioned. Debug indicators include temperature Measurement error, atmospheric pressure measurement error, flow test, calibration film reproducibility and comparison and debugging of reference methods, etc., adjust The test methods and indicators are implemented in accordance with HJ 655.The reference conditions for instrument settings are as follows. Injection tube heating control. turn on heating control when humidity is high. Heating control parameters adopt HJ 655 reference method to compare and adjust The conditions for passing the test or the conditions for passing the HJ 817 accuracy audit. Sampling time or average concentration time. set according to the monitoring purpose, 1 min to 60 min. Sampling flow rate. Under working environment conditions, the gas production flow rate should be kept at a fixed value to ensure the cutting efficiency of the cutter. Travel speed. According to the filter band after sampling, the beta radiation amount is not less than 25% of the blank filter band or the particulate matter specified by the instrument The upper limit of the deposition amount is determined. 7.3 Standard membrane inspection Standard membrane (automatic or manual) inspection should be carried out regularly during the operation of the instrument, and the inspection period should not exceed half a year. Such as checking The error between the result and the nominal value of the standard film is not within ±2%, and the instrument should be calibrated. Required when the standard membrane inspection fails Perform instrument calibration or repair. See 7.4 for the calibration procedure. 7.4 Calibration 7.4.1 Calibration cycle 7.4.1.1 Calibration diaphragm method calibration When the standard film inspection result is unqualified, the instrument needs to be calibrated. 7.4.1.2 Calibration cycle of actual sample weighing method Calibration is generally performed every six months. When the humidity or volatile components change greatly with the season, it can be reduced according to the actual situation. Short calibration cycle. 7.4.1.3 Calibration after repair The instrument must be calibrated after repairing the instrument components related to the quantitative results. 7.4.2 Zero point calibration The pump stops working during calibration to prevent air and particles from entering the sampling device. Select the range, install the filter belt or zero diaphragm, Perform zero point calibration as required by the instrument manual. 7.4.3 Quality calibration 7.4.3.1 Calibration diaphragm method Measure the amount of β rays passing through the filter belt (membrane), and then place a standard value of the actual area mass on the filter belt (membrane) Quasi-membrane, the β-ray dose passing through the filter belt (membrane) and the standard membrane is measured again, based on the two measured values of β-ray dose according to formula (1) Determine the calibration factor k. When using zero diaphragm and standard diaphragm for calibration, first cut and pull out the filter belt, insert the zero diaphragm, and measure the β passing through the zero diaphragm Radiation dose, remove the zero diaphragm, and insert the standard film with the nominal value of the actual area mass of the diaphragm minus the zero diaphragm area quality difference. For the second measurement, the calibration coefficient k is determined according to the formula (1) according to the two measured values of β-ray dose. 7.4.3.2 Actual sample weighing method According to the requirements of HJ 618 and HJ 656, weigh 5 blank filter belts (membrane) and determine the β of 5 blank filter belts (membrane) Ray dose. Use the above 5 blank filter belts (membrane) to collect samples, and you can obtain different particle quality by controlling the sampling time For the concentration of the sample, the particle mass concentration of the 5 samples should cover the local particle concentration level range, and the filter belt after sampling is determined (Film) β-ray dose. Line the attenuation of β rays ln (N1/N2) and the mass of particulate matter before and after the sampling of 5 filter bands (membrane) For linear regression, the slope is the calibration coefficient k. Note 1.When the actual sample weighing method is used, if the material of the filter membrane used for calibration is different from the material of the filter belt used to determine the actual sample, it may be wrong The measurement result has a certain influence, so the calibration filter membrane of the same material as the filter belt should be used to avoid calibration caused by different materials. Quasi-factor difference. Note 2.You can choose one of the above two mass calibration methods. 7.5 Determination of samples Start the measurement after the instrument stabilizes.

8 Calculation and presentation of results

9 Precision and accuracy

9.1 Precision Six laboratories performed 6 repeated measurements on two different concentrations of standard diaphragms in their respective laboratories. The difference is 0.1% to 2.1%. 9.2 Accuracy The six laboratories carried out 6 repeated measurements on the standard diaphragms of different concentrations in their respective laboratories, and the relative error was 0.2%～1.4%. 10 Quality Assurance and Quality Control 10.1 Carry out gas circuit leak detection and flow check once a month, and check the temperature and pressure measurement results every quarter. Check the gas humidity sensor once a year with a standard hygrometer, and record data and instruments with a data acquisition instrument every six months Display or store the consistency check of the monitoring results. When the inspection result does not meet the qualified index of HJ 817, calibration is required. 10.2 Conduct an annual audit of flow, temperature, air pressure, humidity and instrument accuracy. The audit indicators and methods are in accordance with HJ 817 implementation. If the local humidity or volatile components change greatly with the seasons, the instrument accuracy review period can be shortened. 11 Notes The beta-ray source used should comply with radiological safety standards, and the radioactive source should be disposed of in accordance with relevant regulations after the instrument is scrapped. ......

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