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This document gives general guidance for the time-weighted average monitoring of formaldehyde in air by diffusive sampling onto DNPH sorbent tubes followed by off-line analysis using HPLC/UV. This document is valid for the measurement of formaldehyde 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 14 days. The upper limit of the useful range is set by the sorptive capacity of the sampler 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 interfering artefacts on the sampler and in the analytical system. The detection limit will be approximately 1/10 of the lower concentration range of interest. This document provides general guidance for the sampling of formaldehyde using a single diffusive sampler or multiple diffusive samplers used in parallel.
Reģistrācijas numurs (WIID)
78117
Darbības sfēra
This document gives general guidance for the time-weighted average monitoring of formaldehyde in air by diffusive sampling onto DNPH sorbent tubes followed by off-line analysis using HPLC/UV. This document is valid for the measurement of formaldehyde 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 14 days. The upper limit of the useful range is set by the sorptive capacity of the sampler 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 interfering artefacts on the sampler and in the analytical system. The detection limit will be approximately 1/10 of the lower concentration range of interest. This document provides general guidance for the sampling of formaldehyde using a single diffusive sampler or multiple diffusive samplers used in parallel.
