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HJ 920-2017 English PDF

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HJ 920-2017: Ambient air--Emergency monitoring method for inorganic hazardous gas--Portable fourier infrared spectrometer method
Status: Valid

Standard ID	Contents [version]	USD	STEP2	[PDF] delivered in	Standard Title (Description)	Status	PDF
HJ 920-2017	English	299	Add to Cart	3 days [Need to translate]	Ambient air--Emergency monitoring method for inorganic hazardous gas--Portable fourier infrared spectrometer method	Valid	HJ 920-2017

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Basic data

Standard ID	HJ 920-2017 (HJ920-2017)
Description (Translated English)	Ambient air--Emergency monitoring method for inorganic hazardous gas--Portable fourier infrared spectrometer method
Sector / Industry	Environmental Protection Industry Standard
Classification of Chinese Standard	Z15
Word Count Estimation	12,197
Date of Issue	2017-12-28
Date of Implementation	2018-04-01
Regulation (derived from)	Ministry of Environmental Protection Bulletin 2017 No. 85
Issuing agency(ies)	Ministry of Ecology and Environment

HJ 920-2017: Ambient air--Emergency monitoring method for inorganic hazardous gas--Portable fourier infrared spectrometer method

---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.
People's Republic of China national environmental protection standards Ambient air-Emergency monitoring method for inorganic hazardous gas-Portable fourier infrared spectrometer method 2017-12-28 Published 2018-04-01 implementation Directory Foreword .ii 1 scope of application .1 2 Normative references .1 3 method principle .1 4 Interference and elimination .1 5 Reagents and materials .1 6 instruments and equipment .2 7 samples .2 8 Analysis steps .3 9 Results Calculation and Representation .3 10 precision and accuracy 4 11 Quality Assurance and Quality Control .4 12 Matters needing attention 4 Appendix A (Normative) Method detection limit, lower limit of determination and measurement range Appendix B (Normative) Infrared characteristics of gas vibration frequency 6 Appendix C (informative) method of precision and accuracy .7

Foreword

In order to implement the Law of the People's Republic of China on Environmental Protection and the Law of the People's Republic of China on Prevention and Control of Atmospheric Pollution, This standard is formulated by the portable Fourier infrared method for the protection of human health and the determination of inorganic harmful gases in ambient air. This standard specifies the determination of ambient air carbon monoxide, nitrogen dioxide, nitrogen monoxide, sulfur dioxide, carbon dioxide, Hydrogen chloride, hydrogen cyanide, hydrogen fluoride, nitrous oxide, ammonia and other 10 kinds of inorganic harmful gas portable Fourier infrared method. Appendix A and Appendix B of this standard are normative appendices, Appendix C is an informative annex. This standard is released for the first time. This standard by the Environmental Protection Department of Environmental Monitoring Division and Science and Technology Standards Division to develop. This standard was drafted. Zhejiang Provincial Environmental Monitoring Center. This standard verification unit. Hangzhou Environmental Monitoring Center Station, Ningbo City Environmental Monitoring Center, Fengxian District of Shanghai Environmental Supervisor Station, Shanghai Jiading District Environmental Monitoring Station, Nanhui District, Shanghai Environmental Monitoring Station, Xinchang County, Zhejiang Province Environmental Monitoring Station, Zhejiang Jiangde Jiande City Environmental Monitoring Station, Cixi City, Zhejiang Province Environmental Monitoring Station and Beijing Chengtianyouyou Technology Co., Ltd. This standard MEP approved on December 28, This standard since April 1,.2018 come into operation. This standard is interpreted by the MEP. Ambient Air Inorganic Hazardous Gas Emergency Monitoring Portable Fourier infrared method

1 scope of application

This standard specifies the portable Fourier infrared method for the determination of inorganic harmful gases in the ambient air. This standard is qualitative and semi-quantitative method for the ambient air carbon monoxide, nitrogen dioxide, nitrogen monoxide, dioxide Sulfur, carbon dioxide, hydrogen chloride, hydrogen cyanide, hydrogen fluoride, nitrous oxide, ammonia and other inorganic harmful gases on-site emergency monitoring, As well as screening, census and other preliminary investigations. If other inorganic gases can also be verified by this method. The detection limits and determination of the method in Appendix A.

2 Normative references

This standard references the following documents or the terms. For undated references, the effective version applies to this standard. HJ 194 Manual Air Quality Monitoring Technical Specifications HJ 589 emergency environmental monitoring technical specifications HJ/T 55 Guidelines for Unorganized Emissions Monitoring of Air Pollutants

3 method principle

When the molecules to be measured are irradiated with infrared light having a continuously changing wavelength, the specific wavelength of the same specific vibrational frequency as that of the molecule Infrared light is absorbed, the infrared light irradiation molecules with a monochromatic dispersion, according to the wavenumber order, and determine the different wavenumber Absorption intensity, infrared absorption spectrum. By comparing the sample with the infrared spectrum and standard reference library quantitative reference material The spectral peak in the characteristic wave number of the qualitative analysis of the peak; according to the sample peak response to the target value and the standard library of Semi-quantitative analysis of the ratio of peak area response values of the standard substance absorption peak should be carried out.

4 Interference and elimination

4.1 When the air relative humidity is greater than 85%, not suitable for monitoring. 4.2 When the sample contains a large amount of dust, it will pollute the instrument piping and analysis unit, the analysis of the interference, must be mining Install the dust filter (5.2) before the sample tube.

5 Reagents and materials

5.1 Nitrogen. Purity ≥99.9%. 5.2 Dust filter. glass fiber material, aperture ≤ 2 μm.

6 instruments and equipment

6.1 Portable Fourier infrared instrument Working software with qualitative and quantitative functions; Sample pressure is atmospheric pressure; Sample chamber temperature is 50 ℃ ± 2 ℃; Light path length Degree > 9.0 m, using multiple reflection and other methods to meet the detection limit requirements; wavelength range of 600 ~ 4500 cm-1. instrument Structure diagram shown in Figure 1. Figure 1 instrument structure diagram 6.2 Auxiliary equipment 6.2.1 Portable nitrogen bottle. purity ≥ 99.9%. 6.2.2 Battery. continuous power supply time is greater than 1 h, the output voltage of 220 V. 6.2.3 Thermometer. used to measure the ambient temperature, measuring range (-30 ~ 50) ℃, accuracy of ± 0.2 ℃. 6.2.4 Barometer. used to measure the ambient atmospheric pressure, measuring range (50 ~ 107) kPa, accuracy ± 0.1 kPa. 6.2.5 Hygrometer. used to measure the ambient humidity, measuring range (0% ~ 100%) RH, accuracy ± 1%.

7 samples

7.1 Sampling preparation 7.1.1 Check the pressure of the portable nitrogen cylinder ( > 0.2 MPa). 7.1.2 Check whether the battery power meet the power requirements of > 1h. 7.1.3 The instrument is powered on, and connected to the workstation, and then start the instrument until the light intensity, the height of the interferogram, the sample room temperature Degree, test the ambient temperature, humidity to be tested requirements. 7.1.4 Clean with nitrogen gas (5.1) at a flow rate of about 0.2 L/min through the sampler line and sample compartment. 7.2 Sample Collection 7.2.1 Refer to HJ/T 55, HJ 194, HJ 589 for spotting and sampling. Sampling temperature should be (-10 ~ 50) ℃. 7.2.2 Zero calibration of the instrument with nitrogen (5.1), draw the background spectrum, the specific operation, see the operating instructions of each instrument. 7.2.3 Open the sampling pump to start continuous sampling, to ensure that the gas sample filled the sample chamber after the start of sample analysis, the analysis time to select 1 min. 7.2.4 Sample Analysis Results For the instantaneous monitoring results, according to the different monitoring purposes to determine the number of samples collected, generally Collect 5 ~ 6 samples for analysis. 7.2.5 The sample spectrum collected must be numbered in time, and record the ambient temperature, atmospheric pressure and humidity. 7.2.6 After sample collection, purge the sampler tubing and sample compartment with nitrogen (5.1) until there is no absorption peak in the spectrum.

8 Analysis steps

8.1 background deduction Create an application library that contains only water (steam) and carbon dioxide. After getting the analytical spectrum of the sample, use the residual work of the workstation Able to eliminate water (steam) and carbon dioxide spectrum, and then spectral analysis. 8.2 Qualitative analysis Qualitative analysis was performed by comparing the infrared spectrum of the sample with the infrared spectrum of the standard reference material in the standard spectral library; Spectral comparison analysis of products is mainly composed of three basic functions. automatic synthesis spectrum, spectral fitting degree representation and manual verification. Using the instrument software to search the spectrum of the sample, according to the sample spectrum and the standard spectrum of the degree of harmony, and then into a Step by step manual mapping to confirm the qualitative results. If the sample components are complex and there are still other absorption peaks after the first qualitative match of the spectrum is obtained, Conduct a second round of qualitative analysis. The compounds detected in the first round were added to the application library and the residual function was used to deduct the detected After the compound obtained a new residual map. In spectral matching, according to the location of the characteristic peak to select the spectral range to be matched, the residual Figure for the second round of search; according to matching the level of compound in the high and low, manual verification, read the qualitative results. 8.3 Quantitative analysis Qualitative results listed in the application spectrum library, read semi-quantitative analysis results. 8.4 Compound Characteristics Infrared vibration frequency Characteristics of the compound Infrared vibration frequency see Appendix B.

9 results calculated and expressed

9.1 Calculation Results The quantitative results of the instrument are expressed as the mass concentration of the sample under standard conditions. When the unit of the instrument is μmol/mol, the formula (1) is converted into the standard state (273.15K, 101.325kPa) Under the mass concentration. Where. ρ - target compound mass concentration, mg/m3; φ - volume ratio of the target compound, μmol/mol (10-6); M - the molar mass of the target compound, g/mol; 22.4 - Molar volume of gaseous molecules, L/mol at standard state (273.15 K, 101.325 kPa). 9.2 results indicated List the names and concentration of the substances detected. Semi-quantitative determination of less than 100 mg/m3, retained to the whole digit; When equal to 100 mg/m3, take three significant figures. 10 precision and accuracy The method mainly for carbon monoxide, nitrogen dioxide, nitrogen monoxide, sulfur dioxide, carbon dioxide, hydrogen chloride, hydrogen cyanide, Hydrogen fluoride, nitrous oxide and ammonia for qualitative and semi-quantitative analysis, laboratory and laboratory precision and accuracy points Please see Appendix C for the results of the analysis. 11 Quality Assurance and Quality Control 11.1 blank experiment Nitrogen (5.1) must be used for blank experiments prior to sample analysis. The analytes of blank samples should not be detected. 11.2 Equipment and equipment traceability and maintenance In order to ensure the accuracy of the measurement results, the use of standard material traceability; 1 to 2 years on the instrument performance 1 Calibrate, calibrate the instrument once every year. 12 Precautions 12.1 Sampling analysis, to ensure that the instrument's light intensity, the height of the interferogram, the temperature of the sample chamber and other parameters stable Check if the conditions of the environment such as temperature, humidity and dust content meet the requirements. 12.2 If the interference figure of the instrument is found to be relatively low after switching on, apply nitrogen to the detector and the background gas chamber Wash; detector rinse, pay attention to control the nitrogen flow rate. 12.3 Sample collection Before and after the sampler pipelines and sample chamber to clean with nitrogen, in particular, to monitor the concentration of higher or have rot After the erosive gas to be fully cleaned. 12.4 dust filter should be replaced each time to prevent cross-contamination. 12.5 Sample collection process to ensure continuous power supply stability. With battery power, the working time is more than 20 min Above, we must observe the instrument's light intensity, the height of the interference figure and other parameters are normal, in order to prevent the wrong results.

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