BS ISO 16000-4:2011

• 13.040.20 Ambient atmospheres

This part of ISO 16000 specifies a determination of formaldehyde in indoor air using a diffusive sampler with solvent desorption and high performance liquid chromatography (HPLC).

The test method is applicable to the measurement of formaldehyde¹⁾ in indoor air over the range from 0,001 mg/m³ to 1,0 mg/m³ for a sampling period of between 24 h and 72 h. For sampling periods of 24 h, the applicable concentration range is 0,003 mg/m³ to 1 mg/m³, and for 72 h it is 0,001 mg/m³ to 0,33 mg/m³.

NOTE Confirmed samplers with respect to measurement sensitivity and precision can apply to short-term sampling (less than 24 h).

The method is suitable for measurements in atmospheres with conventional indoor air relative humidity and for monitoring at air velocities as low as 0,02 m/s. The chromatographic step in the method is designed to eliminate potential interferences, including those due to the presence of other carbonyl compounds. The sampling method gives a time-weighted average result.

NOTE There are several diffusive samplers with various designs and shapes commercially available. They are all based on the reaction of 2,4-dinitrophenylhydrazine with formaldehyde. They are not specifically described in this part of ISO 16000 to avoid any impression that ISO favours one model over another.