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1000
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Abstract/Summary
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The analytical method is validated for the determination of aromatic amines, such as aniline, 4‐ethoxyaniline, methoxyanilines, methylanilines and dimethylanilines in the air of working areas averaged over the sampling period after personal or stationary sampling. Sampling is performed by drawing a defined volume of air through a glass fibre filter impregnated with sulphuric acid using a suitable pump. The filter is located in a total dust sampling system (Gesamt‐Staub‐Probenahme – GSP). The flow rate is adjusted to 1 L/min whereby the definition of the inhalable dust is fulfilled by this volumetric flow according to EN 481. For sample preparation the collected aromatic amines are desorbed from the filter with a mixture of acetonitrile/ammonia solution. The sample solution is analysed by means of gas chromatography‐mass spectrometry (GC‐MS). Quantitative determination is based on a 10‐point calibration according to DIN 32645 using 4‐propylaniline as internal standard. The limits of quantification (LOQ) are between 0.003 and 0.26 mg/m3 for an air sample volume of 240 litres. The expanded uncertainty for these parameters is between 21 and 23%, depending on the aromatic amine and concentration.
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