EVS-EN 14662-1:2023

This document gives general guidance for the sampling and analysis of benzene in air by pumped
sampling, thermal desorption and capillary gas chromatography.
This document is in accordance with the generic methodology selected as the basis of the European Union
reference method for the determination of benzene in ambient air [1] for the purpose of comparison of
measurement results with limit values with a one-year reference period.
This document is valid for the measurement of benzene in a concentration range of approximately
0,5 μg/m3 to 50 μg/m3. Air samples are typically collected over periods ranging from a few hours
to 7 days.
The upper limit of the useful range is set by the sorptive capacity (the safe sampling volume)
of the sorbent and by the linear dynamic range of the gas chromatograph column and detector or by
the sample splitting capacity of the analytical instrumentation used. The lower limit of the useful range
depends on the noise level of the detector and on blank levels of benzene and/or interfering artefacts
on the sorbent. Artefacts are typically sub ng for graphitised carbon sorbents, but higher levels of
aromatic hydrocarbons have been noted in other sorbents – e.g. porous polymers. The detection limit will
be approximately 1/10 of the lower concentration range.
This document provides general guidance for the sampling of benzene using either a single sampling
device, which is changed manually after every exposure period, or sequential sampling device capable
of storing and exposing multiple samples without user intervention. The analysis methods are diverse,
but a suitable approach for analysing samples and blanks and calculating benzene levels is described
in Annex B.
NOTE The method described in this document can be used for the determination of other compounds besides
benzene, under the condition of documented validation tests.