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Radial diffusive sampling is generally valid for the measurement of airborne vapours of VOCs in a concentration range of approximately 0.3–300 µg/m3 per compound, for exposure times of 1–6 hours. However, for a range of less volatile compounds, exposure times of up to one week may be used.

Note that the high sampling rate (and related risk of back-diffusion) associated with radial diffusive samplers typically restricts the volatility range of these samplers to compounds of equal or lower volatility than benzene. It also means that stronger sorbents are generally required for these samplers when compared with either axial-type diffusive or pumped sorbent tubes.

This note lists sample uptake rates for various compounds.

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