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HJ 965-2018 English PDF

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HJ 965-2018: Ambient air - Automatic determination of carbon monoxide - Non-dispersive infrared spectrometry method
Status: Valid

Standard ID	Contents [version]	USD	STEP2	[PDF] delivered in	Standard Title (Description)	Status	PDF
HJ 965-2018	English	199	Add to Cart	3 days [Need to translate]	Ambient air - Automatic determination of carbon monoxide - Non-dispersive infrared spectrometry method	Valid	HJ 965-2018

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Basic data

Standard ID	HJ 965-2018 (HJ965-2018)
Description (Translated English)	Ambient air - Automatic determination of carbon monoxide - Non-dispersive infrared spectrometry method
Sector / Industry	Environmental Protection Industry Standard
Classification of Chinese Standard	Z15
Word Count Estimation	8,845
Date of Issue	2018-08-31
Date of Implementation	2018-09-01
Regulation (derived from)	Ministry of Ecology and Environment Announcement No. 36 of 2018
Issuing agency(ies)	Ministry of Ecology and Environment

HJ 965-2018: Ambient air - Automatic determination of carbon monoxide - Non-dispersive infrared spectrometry method

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Ambient air - Automatic determination of carbon monoxide - Non-dispersive infrared spectrometry method National Environmental Protection Standard of the People's Republic Automatic determination of ambient air carbon monoxide Non-dispersive infrared method Ambient air-Automatic determination of carbon monoxide- Non-dispersive infrared spectrometry method Published on.2018-08-31 2018-09-01 Implementation Ministry of Ecology and Environment released

Content

Foreword..ii 1 Scope 1 2 Normative references 1 3 Principle of the method 1 4 interference and elimination..1 5 reagents and materials..2 6 instruments and equipment..2 7 Analysis step 3 8 Calculation and representation of results 3 9 Precision and accuracy 4 10 Quality Assurance and Quality Control..4 11 Notes. 4

Foreword

To protect the "Environmental Protection Law of the People's Republic of China" and the "Air Pollution Control Law of the People's Republic of China" This standard is formulated to ensure human health and to regulate the automatic determination of carbon monoxide in ambient air. This standard specifies a non-dispersive infrared method for the automatic determination of carbon monoxide in ambient air. This standard is the first release. This standard is formulated by the Environmental Monitoring Department and the Science and Technology Standards Department. This standard was drafted. Dalian Environmental Monitoring Center. The standard verification unit. Harbin Environmental Monitoring Center Station, Hangzhou Environmental Monitoring Center Station, Anshan City Environmental Monitoring Central Station, Guangzhou Environmental Monitoring Center Station, Shenyang Environmental Monitoring Center Station and Qingdao Environmental Monitoring Center Station. This standard was approved by the Ministry of Ecology and Environment on August 31,.2018. This standard has been implemented since September 1,.2018. This standard is explained by the Ministry of Ecology and Environment. Automatic determination of ambient air carbon monoxide by non-dispersive infrared method Warning. Carbon monoxide is a toxic gas. It should be prevented from leaking during operation and should be protected as required.

1 Scope of application

This standard specifies a non-dispersive infrared method for the automatic determination of carbon monoxide in ambient air. This standard applies to the automatic determination of carbon monoxide in ambient air. When the instrument range is (0 ~ 50) μmol/mol, the detection limit of the method is 0.07 mg/m3, the lower limit of determination It is 0.28 mg/m3. The mass concentration of this standard refers to the concentration under the reference state (298.15 K, 1013.25 hPa).

2 Normative references

This standard refers to the following documents or their terms. For undated references, the valid version applies to this standard. HJ 193 Environmental Air Gaseous Contaminant (SO2, NO2, O3, CO) Continuous Automatic Monitoring System Installation Acceptance Technology specification HJ 654 Technical requirements and inspection of continuous automatic monitoring system for ambient air gaseous pollutants (SO2, NO2, O3, CO) Measuring method HJ 663 Technical Specifications for Ambient Air Quality Assessment (Trial) HJ 818 ambient air gaseous pollutants (SO2, NO2, O3, CO) continuous automatic monitoring system operation and quality control technology Specification

3 Principle of the method

The sample air enters the instrument reaction chamber through the particulate filter at a constant flow rate, and the carbon monoxide is selectively absorbed. 4.7 μm is the infrared light in the center band. In a certain concentration range, the infrared light absorbance is proportional to the concentration of carbon monoxide.

4 interference and elimination

4.1 Water vapor can interfere with the measurement and can be removed by a cooling or narrow band filter. 4.2 When the concentration of carbon dioxide in ambient air is 610 mg/m3, the interference is equivalent to 0.2 mg/m3 of carbon monoxide. If necessary, it can be removed with soda lime. 4.3 In general, hydrocarbons in ambient air do not interfere with the determination of carbon monoxide. When the ambient air is rich in methane At a rate of 326 mg/m3, the interference is equivalent to 0.6 mg/m3 of carbon monoxide.

5 reagents and materials

5.1 Zero gas. Zero gas is generated by zero gas generating device, and can also be provided by zero gas cylinder. The performance index of zero gas should conform to HJ 654. Appendix A requirements. If synthetic air is used, the concentration of oxygen should be (20.9 ± 2)% of the synthetic air. 5.2 Standard gas. certified reference material in μmol/mol. 5.3 Filter membrane. The material is PTFE, the pore size is ≤ 5 μm.

6 Instruments and equipment

6.1 Injection line. It should be PTFE, fluorinated polyethylene propylene, stainless steel that does not react with carbon monoxide. Or materials such as borosilicate glass. 6.2 Particulate filter. Installed between the sampling manifold and the instrument inlet. The other part of the filter except the filter membrane should be Materials such as polytetrafluoroethylene, fluorinated polyethylene propylene, stainless steel or borosilicate glass that do not chemically react with carbon monoxide. If the instrument has a built-in particulate filter, no external particulate filter is required. 6.3 Carbon monoxide analyzer. Performance indicators should meet the requirements of HJ 654. The carbon monoxide measurement system is shown in Figure 1. 1-fan; 2-multiple pipe; 3-air inlet; 4-roof; 5-dehumidifier; 6-particulate filter; 7-motor; 8-infrared source; 9-band pass filter 10-infrared detector; 11-cutter; 12-correlation wheel; 13-amplifier; 14-data output; 15-pump; 16-flow controller; 17-flow 18-exhaust port; 19-standard gas; 20-four-way valve; 21-zero gas; 22-injection line. Figure 1 Schematic diagram of carbon monoxide measurement system

7 Analysis steps

7.1 Installation and commissioning of the instrument After the newly purchased instrument is installed, the parameters should be set according to the operation manual for debugging. Debugging indicators include zero noise, Minimum detection limit, range noise, indication error, range precision, 24 h zero drift and 24 h range drift, commissioned Test methods and indicators are performed in accordance with HJ 193. 7.2 Inspection Zero check, span check and linear check are required during the operation of the instrument. The inspection method is in accordance with HJ 818. Record B execution. If the inspection result is unsatisfactory, the instrument should be calibrated and the instrument repaired if necessary. After the instrument is repaired, a linear inspection should be performed and the instrument recalibrated. 7.3 Calibration 7.3.1 Determining the instrument range The instrument range should be determined according to the actual concentration of carbon monoxide in different seasons. When the concentration of carbon monoxide is below the range At 20%, a lower range should be chosen. 7.3.2 Calibration procedure 7.3.2.1 Pass zero gas into the instrument. After the reading is stable, adjust the instrument output value to be equal to zero. 7.3.2.2 Pass the standard gas with a concentration of 80% of the range into the instrument. After the reading is stable, adjust the output value of the instrument to be equal to the standard. Gas concentration value. 7.4 Determination of samples The sample air is passed into the instrument for automatic determination and recording of carbon monoxide concentration.

8 Calculation and representation of results

8.1 Calculation of results The mass concentration of carbon monoxide is calculated according to formula (1).   5.24 (1) Where. ρ--carbon monoxide mass concentration, mg/m3; 28--Molecular mass of carbon monoxide, g/mol; 24.5--reference state carbon monoxide molar volume, L/mol; Φ--carbon monoxide volume concentration, μmol/mol. 8.2 Results representation The statistical method of data results is performed in accordance with HJ 663. The number of decimal places of the measurement result is consistent with the detection limit, and up to three significant digits are reserved.

9 Precision and accuracy

9.1 precision Six laboratories conducted standard carbon monoxide standards at concentrations of 0.23 mg/m3, 9.14 mg/m3 and 51.4 mg/m3. 6 repeated measurements. the relative standard deviations in the laboratory were 0.3% to 7.6%, 0.0% to 1.8%, and 0.0% to 1.3%, respectively; The relative standard deviations between the trials were 6.0%, 1.2%, and 1.5%, respectively; the repeatability limits were 0.03 mg/m3, 0.35 mg/m3, and 1.02 mg/m 3; Reproducibility limits are 0.05 mg/m3, 0.46 mg/m3 and 2.34 mg/m3. 9.2 Accuracy Six laboratories conducted standard carbon monoxide standards at concentrations of 0.23 mg/m3, 9.14 mg/m3 and 51.4 mg/m3. 6 repeated measurements. relative errors are 1.0% to 18%, 0.3% to 4.3%, and -2.2% to 1.7%, respectively; relative error final value It was 8.6% ± 12%, 2.0% ± 3.0%, and 1.4% ± 9.2%. 10 Quality Assurance and Quality Control 10.1 Instrument Zero Check, Range Check, Linear Check, Flow Check, Calibration Frequency and Indicators in accordance with HJ 818 Row. 10.2 The filter holder of the particulate filter should be cleaned at least once every six months; the filter is usually replaced every 2 weeks, and the particles are thick. In higher areas or at higher concentrations, the frequency of replacement should be increased depending on the actual contamination of the membrane. 10.3 The sampling branch shall be inspected for air tightness every month, once every six months, and replaced if necessary. 11 Precautions After replacing the sampling system components and membranes, collect at least 10 minutes of sample air at normal flow for saturation adsorption. The measurement data generated during the process is not valid data. This process can also be carried out in the laboratory.

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