Abstract
<jats:title>Abstract</jats:title> <jats:p> This analytical method is a validated measurement procedure for the determination of selenium [ <jats:ext-link xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="cas-registration-number" xlink:href="7782-49-2">7782‐49‐2</jats:ext-link> ]and its inorganic compounds in workplace air in a concentration range of one tenth up to twice the currently valid OEL of 0.05 mg/m <jats:sup>3</jats:sup> E. Sampling is performed by drawing a defined volume of air through a membrane filter using a suitable pump. The flow rate ist set to 1.4 L/min and sampling is performed over 2 h. The dust deposited on the membrane filter is treated with acid and then analysed using atomic absorption spectrometry with the graphite furnace technique (GFAAS). The quantitative determination is based on a calibration function, whereat the selenium concentration of the reference standard is plotted against the peak area calculated with an integration program. The limit of quantification is 0.0004 mg/m <jats:sup>3</jats:sup> based on an air sample volume of 168 L. The mean recovery was 113.9% and the expanded uncertainty for a validation range of 0.01 mg/m <jats:sup>3</jats:sup> to 1.0 mg/m <jats:sup>3</jats:sup> was between 27% and 22%. </jats:p>