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eLibrary > BS EN 14662-1:2023 - TC Tracked Changes. Ambient air quality. Standard method for measurement of benzene concentrations - Pumped sampling followed by thermal desorption and gas chromatography >

BS EN 14662-1:2023 - TC Tracked Changes. Ambient air quality. Standard method for measurement of benzene concentrations - Pumped sampling followed by thermal desorption and gas chromatography, 2024

A-30451003.pdf [Go to Page]
undefined
1 Scope
2 Normative references
3 Terms and definitions
4 Method description [Go to Page]
4.1 Principle
4.2 Reagents and materials [Go to Page]
4.2.1 Benzene
4.2.2 Dilution solvent
4.2.3 Dilution gas
4.2.4 Inert gas for sampler conditioning
4.2.5 Calibration standards in samplers
4.2.6 Preparation of calibration gas mixtures
4.2.7 Calibration standards in samplers prepared by vapour spiking of calibration gas mixtures
4.2.8 Preparation of standard solutions for liquid spiking [Go to Page]
4.2.8.1 General
4.2.8.2 Solution containing approximately 5 mg/ml of benzene
4.2.9 Stability of standard solutions
4.2.10 Calibration standards in samplers prepared by liquid spiking of standard solutions
4.3 Apparatus [Go to Page]
4.3.1 Samplers
4.3.2 Sampler and caps
4.3.3 Types of sampling devices [Go to Page]
4.3.3.1 General
4.3.3.2 Single sampling device
4.3.3.3 Multiplexing sampling device
4.3.3.4 Parallel sampling device
4.3.4 Sequential sampling devices [Go to Page]
4.3.4.1 General
4.3.4.2 Individual sequential sampling device
4.3.4.3 Parallel sequential sampling device
4.3.4.4 Other functionality
4.3.5 Tubing
4.3.6 Flow calibration device
4.3.7 Gas chromatograph
4.3.8 Thermal desorption (TD) apparatus
4.4 Sampler conditioning and blank profiling [Go to Page]
4.4.1 General
4.4.2 Initial conditioning
4.4.3 Ongoing conditioning
4.4.4 Testing of blanks
4.5 Setting of sampling flow rate
4.6 Sampling
5 Air inlet/manifold sampling equipment [Go to Page]
5.1 General
5.2 Sampling location [Go to Page]
5.2.1 General
5.2.2 Protective shield
5.2.3 Positioning of the inlet
5.3 Sample delivery [Go to Page]
5.3.1 General
5.3.2 Construction
5.3.3 Particle filter
5.3.4 Conditioning
6 Type testing [Go to Page]
6.1 General
6.2 Relevant performance characteristics and performance criteria
6.3 Type testing programme [Go to Page]
6.3.1 Laboratory tests [Go to Page]
6.3.1.1 Sampling equipment design
6.3.1.2 Inlet design
6.3.1.3 Flow control system
6.3.1.4 Sampled volume
6.3.1.5 Constancy of flow through sequentially or parallel sampled tubes
6.3.1.6 Leak tightness of the sampling device
6.3.1.7 Storage of samplers within the sequential sampling device
6.3.1.8 Single tube sampling period
6.3.1.9 Uncertainty of the sampling time measurement
6.3.1.10 Recording of operational parameters
6.3.1.11 Impact of mains voltage failure
6.3.2 Evaluation of test results
7 Field operations and ongoing quality control [Go to Page]
7.1 General
7.2 Frequency of calibrations, checks and maintenance
7.3 Maintenance of the sampling device
7.4 Checks of sampling device sensors
7.5 Calibration of sampling device sensors
7.6 Checks of the sampling system flow rate
7.7 Calibration of the sampling device flow rate
7.8 Leak check of the sampling system
7.9 Evaluation of sample losses in the sampling device
8 Determination of measurement uncertainty [Go to Page]
8.1 General
8.2 Parameters contributing to measurement uncertainty [Go to Page]
8.2.1 Parameters to be assessed and minimum requirements
8.2.2 Between-laboratory uncertainty
9 Report
10 Recommendations for use
Annex A (informative)Sorbent selection and characteristics
Annex B (informative)Analysis of exposed samples [Go to Page]
B.1 Safety precautions
B.2 Thermal desorption
B.3 Determination of desorption efficiency
B.4 Calibration
B.5 Determination of sample concentration
B.6 Calculation of mass concentration of benzene
Annex C (informative)Determination of breakthrough volume from gas standards [Go to Page]
C.1 Reagents
C.2 Apparatus
C.3 Determination
C.4 Calculations
Annex D (informative)Determination of breakthrough volumes from extrapolated retention volumes [Go to Page]
D.1 Apparatus
D.2 Reagents
D.3 Determination
D.4 Expression of results
Annex E (informative)Assessment of performance indicators and uncertainty contributions [Go to Page]
E.1 General
E.2 Sample volume [Go to Page]
E.2.1 General
E.2.2 Sample flow calibration and measurement
E.2.3 Sampling time
E.2.4 Conversion of sampling volume to STP [Go to Page]
E.2.4.1 Mass-flow controlled sampling devices
E.2.4.2 Volume-controlled sampling devices
E.3 Desorption efficiency and analytical repeatability [Go to Page]
E.3.1 Introduction
E.3.2 Desorption efficiency
E.3.3 Analytical repeatability
E.4 Mass of benzene sampled [Go to Page]
E.4.1 General
E.4.2 Sampling efficiency
E.4.3 Sample stability
E.4.4 Corrections to the measured mass of benzene [Go to Page]
E.4.4.1 General
E.4.4.2 Calibration standards
E.4.4.3 Lack-of-fit of calibration function
E.4.4.4 Response drift between calibrations
E.4.4.5 Selectivity
E.4.5 Combined uncertainty in the measured mass of benzene
E.4.6 Combined uncertainty in the sampled mass of benzene
E.5 Mass of benzene in sample blank
E.6 Combined uncertainty in benzene concentration
E.7 Expanded uncertainty
E.8 Uncertainty from performance requirements [Go to Page]
E.8.1 General
E.8.2 Analyte Ingress from air being sampled
E.8.3 Analyte Ingress from Surrounding Air
E.8.4 Loss of Retained Analyte
E.9 Between-laboratory uncertainty
E.10 Example for uncertainty budget calculation
Annex F (informative)Reproducibility, validation and comparison exercises
Annex G (informative)Performance characteristics [Go to Page]
G.1 Prior art
G.2 Results of inter-laboratory comparisons
Annex H (informative)Sampling equipment
Annex I (informative)Significant technical changes [Go to Page]

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