This document gives general guidance for the time-weighted average monitoring of formaldehyde in air by pumped 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 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 interfering artefacts on the sorbent and in the analytical system. The detection limit will be approximately 1/10 of the lower concentration range. This document provides general guidance for the sampling of formaldehyde using either a single sampler, which is changed manually after every exposure period, or a multi-tube sampler capable of storing and exposing multiple samples sequentially without user intervention.
Registration number (WIID)
78120
Scope
This document gives general guidance for the time-weighted average monitoring of formaldehyde in air by pumped 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 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 interfering artefacts on the sorbent and in the analytical system. The detection limit will be approximately 1/10 of the lower concentration range. This document provides general guidance for the sampling of formaldehyde using either a single sampler, which is changed manually after every exposure period, or a multi-tube sampler capable of storing and exposing multiple samples sequentially without user intervention.
