QX/T 272-2015 in English

VALID

Monitoring method for atmospheric sulfur dioxide. Ultraviolet fluorescence method

Issued on:2015-07-28
Implemented on:2015-12-01
File Format:PDF
Delivery:Via email within 1~3 business days

Price(USD)： $530.00
$515.00

Standard No:	QX/T 272-2015
Document status:	VALID
Title in English:	Monitoring method for atmospheric sulfur dioxide. Ultraviolet fluorescence method
Title in Chinese:	大气二氧化硫监测方法紫外荧光法
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 1~3 business days
Issued on:	2015-07-28
Implemented on:	2015-12-01
ICS Classification:	07.060-Geology. Meteorology. Hydrology
Chinese Classification:	A47-Meteorology
Professional Classification:	QX-Meteorology
Related Keywords:	ultraviolet fluorescence method ultraviolet fluorescence method introduction interpretation atmospheric sulfur dioxide sulfur dioxide 5-point calibration key system components uv fluorescence analyzer
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Introduction

Interpretation of the core content of the standard

QX/T 272-2015 specifies the full-process technical requirements for measuring sulfur dioxide in the near-surface atmosphere using the ultraviolet fluorescence method. Its technical framework includes:

Measurement principle and technical characteristics

Based on the characteristic that sulfur dioxide molecules release 240-420nm fluorescence after being excited by 200-220nm ultraviolet light, the concentration measurement is achieved by detecting the fluorescence intensity through a photomultiplier tube.

Low detection limit: up to nanoliter (nL/L)
Strong anti-interference: eliminate interference such as aromatic hydrocarbons through the scrubber
High stability: temperature compensation error <2%

Performance indicators	Requirements	Test conditions
Response time	≤2 minutes	ISO 9169
Zero drift	＜2nL/L/week	Zero gas test
Linearity error	≤2% (50-500nL/L)	5-point calibration

Key system components

UV fluorescence analyzer must include:

Polytetrafluoroethylene sampling line (inner diameter ≥4mm)
5μm particle filter membrane
Pulsed UV light source (200-220nm)
Temperature controlled reaction pool (±0.5℃)

Case: A provincial meteorological station uses a Thermo Scientific 43i analyzer, and after calibration with standard gas, the annual data efficiency reaches 98.7%.

Calibration and quality control

Establish a three-level measurement value transfer system:

International standard gas (designated by WMO)
National standard gas (CMC certified)

Working standard gas (for station-level use)

Multi-point calibration requirements:

≥5 concentration points (covering 80-90% of the measuring range)

Correlation coefficient R²＞0.999

Calibrate once every 3 months

Implementation recommendations

Site selection specifications

Should meet the following requirements:

Distance from pollution source＞10 times the building height

Sampling port height 1.5-2m (flat roof)

270° sector-shaped obstacle-free area

Data abnormality processing

Invalid data should be marked when the following situations occur:

Data within 15 minutes after calibration

Flow fluctuation>±2%

Temperature exceeds the range of 10-30℃

More samples: QC/T 942-2021 GB 50021-2001(2009) YD/T 3934-2021

Sample only — not a preview of QX/T 272-2015

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