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

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 beta-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 beta-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

7 Analysis steps

8 Calculation and presentation of results

9 Precision and accuracy

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.