Schwefelkohlenstoff – Bestimmung von Schwefelkohlenstoff in der Luft am Arbeitsplatz mittels Headspace-Gaschromatographie (Headspace-GC-FPD)
Luftanalysen-Methode
Andreas Grill1 (Methodenentwicklung)Claus-Peter Maschmeier2 (Methodenprüfung)
Ralph Hebisch3 (Leitung der Arbeitsgruppe „Luftanalysen“ der Ständigen Senatskommission zur Prüfung gesundheitsschädlicher Arbeitsstoffe, Deutsche Forschungsgemeinschaft)
Andrea Hartwig4 (Vorsitz der Ständigen Senatskommission zur Prüfung gesundheitsschädlicher Arbeitsstoffe, Deutsche Forschungsgemeinschaft)
MAK Commission5
1 Kelheim Fibres GmbH, Regensburger Str. 109, 93309 Kelheim, Deutschland
2 Land Sachsenanhalt, Gebrüder-Bethmann-Str. 18, 06862 Dessau-Roßlau, Deutschland
3 Bundesanstalt für Arbeitsschutz und Arbeitsmedizin (BAuA), Friedrich-Henkel-Weg 1–25, 44149 Dortmund, Deutschland
4 Institut für Angewandte Biowissenschaften, Abteilung Lebensmittelchemie und Toxikologie, Karlsruher Institut für Technologie (KIT), Adenauerring 20a, Geb. 50.41, 76131 Karlsruhe, Deutschland
5 Ständige Senatskommission zur Prüfung gesundheitsschädlicher Arbeitsstoffe, Deutsche Forschungsgemeinschaft, Kennedyallee 40, 53175 Bonn, Deutschland
Abstract
The working group “Air Analyses” of the German Senate Commission for the Investigation of Health Hazards of Chemical Compounds in the Work Area (MAK Commission) developed and verified the presented analytical method. It is used to the determine the levels of carbon disulfide [75-15-0] that occur in the workplace air. The method covers concentrations in the range from one tenth to twice the current German Occupational Exposure Limit Value (OELV) of 30 mg/m3. It is also suitable for monitoring compliance with the MAK value of 16 mg/m3 and the short-term exposure limit (STEL; excursion factor 2). Samples are collected by drawing a defined volume of air through a sampling tube filled with activated carbon using a flow regulated pump at a maximal volumetric flow rate of 0.333 l/min. Exposure during the shift is measured with a sampling period of 2 hours (up to 8 hours, depending on the volumetric flow) and the short-term exposure with a period of 15 minutes. The carbon disulfide adsorbed to the activated carbon is extracted with toluene and analysed by headspace gas chromatography with flame photometric detection. The quantitative determination is based on multiple-point calibrations with an internal standard. A relative limit of quantifiation (LOQ) of 0.5 mg/m3 is obtained for an air sample volume of 40 litres and a usage volume of 18 ml. As the relative LOQ for a sample volume of 5 litres is below 5 mg/m3, the STEL can also be measured. The recovery, which has to be considered for the calculation of the results, is approx. 70% and the expanded uncertainty is below 22% for a sampling period of 2 hours and below 23% for a period of 15 minutes.
