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GB/T 38386-2019: Gas analysis - Determination of oxynitride in gases - The method of Cavity Ring-Down Spectroscopy
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Gas analysis - Determination of oxynitride in gases - The method of Cavity Ring-Down Spectroscopy
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GB/T 38386-2019
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Basic data | Standard ID | GB/T 38386-2019 (GB/T38386-2019) | | Description (Translated English) | Gas analysis - Determination of oxynitride in gases - The method of Cavity Ring-Down Spectroscopy | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | G86 | | Classification of International Standard | 71.100.20 | | Word Count Estimation | 6,691 | | Date of Issue | 2019-12-31 | | Date of Implementation | 2020-11-01 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 38386-2019: Gas analysis - Determination of oxynitride in gases - The method of Cavity Ring-Down Spectroscopy
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Gas analysis-Determination of oxynitride in gases-The method of Cavity Ring-Down Spectroscopy
ICS 71.100.20
G86
National Standards of People's Republic of China
Gas analysis-Determination of nitrogen oxides
Optical cavity ring-down spectroscopy
2019-12-31 release
2020-11-01 implementation
State Administration of Market Supervision
Published by the National Standardization Administration
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard was proposed by the China Petroleum and Chemical Industry Federation.
This standard is under the jurisdiction of the National Gas Standardization Technical Committee (SAC/TC206).
This standard was drafted. Southwest Chemical Research and Design Institute Co., Ltd., Tianjin Lianbo Chemical Co., Ltd., Guangdong Huate Gas Co., Ltd.
Co., Ltd., Tianjin Changlu Huaxin Chemical Co., Ltd., Henan Institute of Metrology Science, Suzhou Jinhong Gas Co., Ltd., Kai Ai
Analytical Instrument (Shanghai) Co., Ltd., Hubei Provincial Institute of Standardization and Quality, Inner Mongolia Light Energy Technology Co., Ltd., Shanghai Huaai Chromatographic Analysis
Technology Co., Ltd., Shenzhen Power Supply Bureau Co., Ltd., Sichuan Tianyi Technology Co., Ltd. Wuhan Gas Supply Branch.
The main drafters of this standard. Cheng Xueqing, Wang Shaonan, Zhou Pengyun, Schroding, Wang Shaoyang, Fu Zhuhong, Chen Yanshan, Cui Xuewen, Li Yujiao,
Song Xiaoming, Jin Xianghua, Sun Meng, Zhu Weiyu, Yang Jian, Zhang Jing, Yan Wenbin, Fang Hua, Tang Feng, Shen Cuiping, Lai Xiaofeng, Ma Changning.
Gas analysis-Determination of nitrogen oxides
Optical cavity ring-down spectroscopy
1 Scope
This standard specifies the principle of the method for determining nitrogen oxides in gas by optical cavity ring-down spectrometry, general requirements for instruments, and requirements for instrument calibration.
Requirements, test procedures, results processing and reporting.
This standard applies to the determination of nitrogen monoxide and nitrogen dioxide content in the gas.The measurement range of the nitrogen monoxide content. (1 ~ 1000) ×
Measurement range of 10-6 (volume fraction) and nitrogen dioxide content. (0.1 ~ 1000) × 10-6 (volume fraction). This standard does not apply to absorption
Interfering gases in the spectrum.
2 Normative references
The following documents are essential for the application of this document. For dated references, only the dated version applies to this article
Pieces. For undated references, the latest version (including all amendments) applies to this document.
GB/T 3723 General safety rules for sampling of industrial chemical products
GB/T 5274.1 Preparation of mixed gas for gas analysis and calibration. Part 1. Preparation of first mixed gas by weighing method
GB/T 5275.10 Gas analysis by dynamic volume method for preparation of calibration gas mixtures-Part 10. Permeation method
GB/T 5275.11 Gas analysis by dynamic volume method for preparation of calibration gas mixtures-Part 11. Electrochemical generation method
GB/T 5832.3 Determination of trace moisture in gases. Part 3. Optical cavity decay spectrometry
GB/T 18403.1 Gas Analyzer Performance Representation Part 1. General
GB/T 33360 Guidelines for Gas Purification Technology for Trace Analysis
3 terms and definitions
The terms and definitions defined in GB/T 5832.3 apply to this document.
4 Method principle
After a single-wavelength laser enters the light cavity, the light beam oscillates back and forth between the cavity mirrors. When the light source is turned off, its energy will change over time
Attenuation, the speed of attenuation is related to the loss (including transmission and scattering) of the optical cavity itself and the absorption of the measured component (medium) in the cavity. For a given
Optical cavity, its own loss is constant. The speed of light energy decay is related to the content of the measured component. The content of the measured component and its molecule
The density in the optical cavity is proportional to the density of the molecule, which is determined by the decay time according to formula (1).
D =
c × σ (ν) ×
τ (ν)-
τempty
÷ (1)
Where.
D --- the measured molecular density, which is directly proportional to the content, the unit is per cubic meter (a/m3);
c --- speed of light, 299792458m/s;
σ (ν)-the cross section of the absorption of the molecule at the laser frequency ν, in square meters (m2);
τ (ν) --- the decay time of the absorbing medium, in seconds (s);
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