GB/T 35099-2018 English PDF

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GB/T 35099-2018: Microbeam analysis -- Scanning electron microscopy with energy dispersive X-ray spectrometry -- Morphology and element analysis of single fine particles in ambient air
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 35099-2018	339	Add to Cart	4 days	Microbeam analysis -- Scanning electron microscopy with energy dispersive X-ray spectrometry -- Morphology and element analysis of single fine particles in ambient air	Valid

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Basic data

Standard ID: GB/T 35099-2018 (GB/T35099-2018)
Description (Translated English): Microbeam analysis -- Scanning electron microscopy with energy dispersive X-ray spectrometry -- Morphology and element analysis of single fine particles in ambient air
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: G04
Classification of International Standard: 71.040.40
Word Count Estimation: 17,145
Date of Issue: 2018-05-14
Date of Implementation: 2019-04-01
Regulation (derived from): National Standards Announcement No. 6 of 2018
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration

GB/T 35099-2018: Microbeam analysis -- Scanning electron microscopy with energy dispersive X-ray spectrometry -- Morphology and element analysis of single fine particles in ambient air

---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.
(Microbeam Analysis Scanning Electron Microscopy-Energy Spectrometry Single Particle Morphology and Elemental Analysis of Atmospheric Fine Particles) ICS 71.040.40 G04 National Standards of People's Republic of China Microbeam analysis scanning electron microscopy-energy spectroscopy Single particle morphology and elemental analysis of atmospheric fine particles Inambientair Published on.2018-05-14 Implementation of.2019-04-01 State market supervision and administration China National Standardization Administration issued

Content

Foreword III Introduction IV 1 Scope 1 2 Normative references 1 3 Terms and Definitions 1 4 Analysis principle 1 5 instruments and materials 2 6 Sample Collection and Storage 2 7 Sample Analysis 3 8 Data processing and result calculation 4 9 Analysis results released 5 Appendix A (informative) Scanning electron microscopy of particulate matter on nuclear pore membrane and nuclear pore membrane 6 Appendix B (informative) Scanning electron microscopy single particle analysis record table reference format 7 Appendix C (informative) Main types of particulate matter in ambient air, typical morphology and energy spectrum characteristics of single particles 8

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard is proposed and managed by the National Microbeam Standardization Technical Committee (SAC/TC38). This standard was drafted. National Environmental Analysis and Testing Center, Beijing University of Chemical Technology. The main drafters of this standard. Dong Shuping, Yin Huimin, Li Yuwu, Chen Hangyu, Ren Lijun, Du Yuyu, Xu Zhongjun.

Introduction

In recent years, the prevention and control of fine particles (PM2.5) pollution in the ambient air has become an environmental issue of widespread concern in our society. Accurately identify fine The type of particle source provides technical support for targeted treatment of particulate matter pollution and improvement of ambient air quality. A difficult task. Qualitative identification and quantitative analysis of different particle size sources is the main content of atmospheric particulate matter research. First, it is an important basis for environmental policy formulation and pollution prevention. At present, the main method for the analysis of the source of fine particles in ambient air is based on the results of environmental sample collection and chemical analysis of the whole sample. Body model method. Research on ambient air fine particles has evolved from early full-sample chemical analysis to single-particle analysis. Because of the single The sampling time required for particle analysis is short, and a small number of samples can be analyzed, which makes the measurement of short-term composition changes of ambient air fine particles. The amount is more accurate. In addition, single-particle analysis data can be used as a “fingerprint” for natural or anthropogenic sources. Single particle analysis has become a country An important technical means to characterize the fine particles of ambient air inside and outside. Scanning electron microscopy combined with spectrometer (SEM-EDS) is one of the simple and fast single particle characterization techniques. This technology can be visually recognized Do not distinguish between the types of particulate matter, make an intuitive and clear judgment on the source type, and give the source contribution based on the count statistics of the number of particles. Rate, the particle pollution characteristics of different particle size ranges are obtained. This technology combines with the original full sample analysis method to make the source analysis work more complete. Face, more accurate, especially for the identification of specific pollution sources have their own unique advantages, is expected to play an important role in the prevention and control of smog pollution. Microbeam analysis scanning electron microscopy-energy spectroscopy Single particle morphology and elemental analysis of atmospheric fine particles

1 Scope

This standard specifies the use of scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) to observe the appearance of fine particles in ambient air. Sexual analysis elements, a method of classifying ambient airborne particulate matter. Scanning electron microscopy for particle morphology observation and particle size measurement, X-ray The energy spectrometer is used for qualitative analysis of the main elements of particulate matter. This standard is applicable to the analysis of particles that are stable under electron beam bombardment. It is not applicable to thermally unstable particles such as nitrates and ammonium salts. analysis.

2 Normative references

The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article. Pieces. For undated references, the latest edition (including all amendments) applies to this document. General requirements for GB/T 27025 testing and calibration laboratory capabilities HJ618 Determination of ambient air PM10 and PM2.5 gravimetric method

3 Terms and definitions

The following terms and definitions apply to this document. 3.1 Single particle single particle A single particle having a particle size ranging from 0.5 μm to 10 μm in ambient air. 3.2 Nuclear pore membrane capilary-porepolycarbonateaerosolfilters A special polycarbonate film prepared by nuclear track etching.

4 Analysis principle

Scanning electron microscopy (SEM) works. the concentrated electron beam after high-pressure acceleration bombards the sample placed in the sample chamber and generates secondary electricity. The detector detects the secondary electronic signal and converts it into an electrical signal, which is amplified by the amplifier to display the surface topography and grain of the sample on the display. The size of the path. X-ray energy spectrometer (EDS) works. Focusing the electron beam to bombard the surface of the sample, exciting the characteristic X-rays of the constituent elements of the sample. The element type is determined based on the energy of the characteristic X-ray, and qualitative analysis is performed according to the line intensity. Comprehensive analysis of the morphological characteristics, particle size and main element composition of single particles, and the typical morphology and spectrum of particulate matter from different sources The graphs are compared to identify possible sources of single particles. Based on analytical data for a certain number (eg, 300 to 1000) of individual particles, The percentage of various types of particulate matter in different particle size ranges is obtained. ......

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