2025/01/01 by Tschickardt, Michael, Krämer, Wilhelm, Schmitt, Ralf +3
Chemistry · Environmental Science · Agricultural and Biological Sciences · #Analytical chemistry methods development #Indoor Air Quality and Microbial Exposure #Pesticide Residue Analysis and Safety
paper · doi:10.34865/am9895d0020_w
This analytical method is a validated measurement procedure for the determination of nitrobenzene [98‐95‐3] in workplace air in a concentration range of one tenth up to twice the currently valid OEL or MAK value of 0.51 mg/m3. With this method simultaneously airborne nitrobenzene in the gaseous state as well as particles are collected. Sampling is performed by drawing a defined volume of air through a quartz fibre filter located in the sampling head GGP‐Mini with an adsorption tube filled with Tenax TA connected downstream using a suitable pump. The flow rate is set to 0.066 L/min with a recommended air sample volume of approx. 4 litres. The collected nitrobenzene is thermally desorbed and then analysed by means of gas chromatography using two detectors, a FID for quantification and a MSD to recognise potential interferences. The quantitative determination is based on a calibration function obtained by means of a multi‐point calibration. The limit of quantification is 0.0085 mg/m3 based on an air sample of 4 litres.