QX/T 218-2013 in English

VALID

Determination of Volatile Organic Compound in Atmosphere - Sampling with Sampling Can and Gas Chromatography-mass Spectrum Combination Analysis Method

Issued on:2013-12-22
Implemented on:2014-05-01
File Format:PDF
Delivery:Via email within 1~3 business days

Price(USD)： $330.00
$321.00

Standard No:	QX/T 218-2013
Document status:	VALID
Title in English:	Determination of Volatile Organic Compound in Atmosphere - Sampling with Sampling Can and Gas Chromatography-mass Spectrum Combination Analysis Method
Title in Chinese:	大气中挥发性有机物测定采样罐采样和气相色谱/质谱联用分析法
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 1~3 business days
Issued on:	2013-12-22
Implemented on:	2014-05-01
Professional Classification:	QX-Meteorology
Related Keywords:	gas chromatography-mass spectrum combination analysis method introduction standard background analysis method volatile organic compound instantaneous sampling rapid sampling
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Introduction

Standard Background and Scope of Application

This standard is formulated to meet the monitoring needs of volatile organic compounds (VOCs) in the atmosphere. As the precursors of ozone and organic aerosols, the accurate determination of VOCs is crucial to the study of air pollution. It is applicable to the analysis method using sampling cylinder collection combined with gas chromatography/mass spectrometry (GC/MS).

Core technology and equipment requirements

Equipment type	Technical requirements	Performance indicators
Sampling cylinder	Passivated stainless steel material	Volume ≥2.7L, pressure resistance 200kPa
Pre-concentration system	Three-stage cold trap module	Can separate H₂O/O₂/CO₂
GC/MS	Electron ionization source	Mass range 35-300u, sweep frequency ≥10Hz

Key operation process

Sampling phase

Instantaneous sampling: 30 seconds rapid sampling, the operator needs to be downwind; Continuous sampling: the flow rate is controlled by the current limiting device (1-24h).

Vacuum test of sampling cylinder (≤20Pa)
Pressure leak test (24h pressure drop <14kPa)
Blank test (target object not detected)

Analysis phase

Typical chromatographic conditions:

Chromatographic column: DB-5MS (60m×0.32mm×1μm)
Program temperature: -50℃(3min)→170℃(4℃/min)→220℃(14℃/min)
Mass spectrometry mode: full scan (35-300m/z) in parallel with SIM

Method performance indicators

Parameters	Requirements	Typical value (taking benzene as an example)
Detection limit (MDL)	99% confidence level	0.3nL/L
Parallelism RSD	＜25%	15%
Spike recovery	90-120%	105%

Implementation suggestions

Selection of standard materials: NIST traceable mixed gas standards are preferred, and the concentration range should cover 0.5-2 times of environmental samples
Quality control: Each batch of samples must contain 10% parallel samples, and regular calibration verification of intermediate concentration points (RRF deviation <30%)
Interference elimination: For polar compounds (such as aldehydes and ketones), it is recommended to add 5% phenyl methyl polysiloxane chromatographic column to assist in analysis

More samples: JJG 21-2008 JGJ 94-2008 NB/T 47013.2-2015

Sample only — not a preview of QX/T 218-2013

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