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BS EN 12341:2023

BS EN 12341:2023

$198.66

Ambient air. Standard gravimetric measurement method for the determination of the PM10 or PM2,5 mass concentration of suspended particulate matter

Published By Publication Date Number of Pages
BSI 2023 64
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This European Standard describes a standard method for determining the PM10 or PM2,5 mass concentrations of suspendedparticulate matter in ambient air by sampling the particulate matter on filters and weighing them by means of a balance. Measurements are performed with samplers with inlet designs as specified in Annex A, operating at a nominal flow rate of 2,3 m3/h,over a nominal sampling period of 24 h. Measurement results are expressed in μg/m3, where the volume of air is the volume atambient conditions near the inlet at the time of sampling. The range of application of this European Standard is for 24 h measurements from approximately 1 μg/m3 (i.e. the limit of detection ofthe standard measurement method expressed as its uncertainty) up to 150 μg/m3 for PM10 and 120 μg/m3 for PM2,5. This European Standard describes procedures and gives requirements for the testing and use of so-called sequential samplers,equipped with a filter changer, suitable for extended stand-alone operation. Sequential samplers are commonly used throughout theEuropean Union for the measurement of concentrations in ambient air of PM10 or PM2,5. However, this European Standard does notexclude the use of single-filter samplers. This European Standard represents an evolution of earlier European Standards (EN 12341:1998 and 2014, EN 14907:2005). Newequipment procured shall comply fully with this European Standard. Older versions of these samplers, including those described in EN 12341:2014 Annex B, have a special status in terms of their use. These samplers can still be used for monitoring purposes and for ongoing quality control, provided that a well justified additionalallowance is made to their uncertainties This European Standard also provides guidance for the selection and testing of filters with the aim of reducing the measurementuncertainty of the results obtained when applying this European Standard.

PDF Catalog

PDF Pages PDF Title
2 undefined
8 1 Scope
2 Normative references
3 Terms, definitions, symbols and abbreviations
3.1 Terms and definitions
12 3.2 Symbols and abbreviations
14 4 Principle
4.1 Description of the standard measuring principle
4.2 Initial use and procedures for ongoing QA/QC
4.3 Evaluation of measurement uncertainty
5 Equipment, facilities and testing
5.1 Sampling system components and programme for type testing
5.1.1 General
18 5.1.2 Sampler design
5.1.3 Standard inlet design
19 5.1.4 Connecting pipe work
5.1.5 Filter holder and filter
5.1.5.1 Filter holder
20 5.1.5.2 Filter
5.1.6 Flow control system
22 5.1.7 Temperature sensors
5.1.8 Ambient pressure sensor
5.1.9 Sampling period
5.1.10 Leak tightness of the sampling system
5.1.10.1 General
23 5.1.10.2 Low pressure method
5.1.10.3 Volumetric method
24 5.1.11 Storage conditions
5.1.12 Recording of operational parameters
25 5.1.13 Effect of failure of mains power
5.1.14 Effect of ending sampling early due to filter clogging
5.1.15 Firmware, software and manual versions
26 5.2 Sampling system components and programme for type testing
27 5.3 Field tests for type testing
5.3.1 General
5.3.2 Performance tests
28 5.4 Type testing report
6 Filter conditioning, sampling, weighing facilities and weighing procedures
6.1 General
30 6.2 Weighing Facilities
6.2.1 Weighing room
6.2.2 Balance
6.3 Filter conditioning and weighing prior to sampling
31 6.4 Sampling procedure
6.4.1 Filter cassette loading
6.4.2 Filter sampling
6.4.3 Sample storage and transport procedures
6.5 Filter conditioning and weighing after sampling
32 6.6 Weighing room procedures
6.7 Filter blanks for ongoing quality control
6.7.1 General
6.7.2 Weighing room blanks
33 6.7.3 Field blanks
7 Ongoing quality control
7.1 General
7.2 Frequency of calibrations, checks and maintenance
34 7.3 Recording of operational parameters
35 7.4 Maintenance of the sampling system
7.5 Checks of sampler sensors
7.6 Calibration of sampler sensors
36 7.7 Checks of the sampler flow rate
7.8 Calibration of the sampler flow rate
7.9 Leak check of the sampling system
7.10 Checks of weighing facility sensors
7.11 Calibration of weighing facility sensors
7.12 Balance
37 7.13 Check of the accuracy of sampler clock
8 Expression of results
9 Performance characteristics of the method
9.1 General
9.2 GUM concept
39 9.3 Individual uncertainty sources
9.3.1 General
9.3.2 Collected particulate mass
9.3.2.1 Deviation of size selection performance from designated characteristic
9.3.2.2 Deposition losses in the connecting pipe work
9.3.2.3 Filter collection efficiency
40 9.3.2.4 Loss of semi-volatile particulate matter between collection and weighing
9.3.2.5 Change in filter mass due to water content
9.3.2.6 Variation in mass of particulate matter due to water content
41 9.3.2.7 Changes in buoyancy effects between the unsampled and sampled weighings
9.3.2.8 Balance uncertainty, span and zero drift
9.3.2.9 Effects of static electrical forces during weighing
9.3.2.10 Contamination or loss of filter material between unsampled and sampled weighings
9.3.2.11 Artefacts due to interactions between the filter material and gases
9.3.2.12 Flow rate (φa)
42 9.3.3 Time (t)
9.3.4 Uncertainty budget
44 9.4 Expanded uncertainty vs. EU Data Quality Objectives
45 Annex A (normative)Design drawing of standard inlet for the sampling of PM10 and PM2,5
46 Annex B (informative)Scheme of PM standard sampler
47 Annex C (informative)Suitability tests for filters
C.1 Particle retention test
C.2 Filter material integrity test
C.3 Base mass reproducibility test
C.4 Static charging test
48 C.5 Water sorption test
49 Annex D (normative)Initial suitability testing of weighing facilities
D.1 Accuracy and stability of temperature and relative humidity
D.2 Accuracy and stability of balance
D.3 Accuracy and precision of the weighing procedure
50 Annex E (informative)Results of experimental work
52 Annex F (informative)Impactor efficiency
54 Annex G (normative)Elements of type testing report
56 Annex H (informative)Example for uncertainty budget calculation
H.1 General
H.2 Calculation using data from prescribed type testing
57 H.3 Measurement uncertainty derived from ongoing field Quality Control
60 Annex I (informative)Technical changes in EN 12341 with respect to version 2014 [21]

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BS EN 12341:2023
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