By Antonius Kettrup
This is often the 5th quantity in a global sequence of analytical equipment for the decision of toxicants within the air on the place of work. All tools are trustworthy, reproducable and meet the necessities for qc. The research of the degrees of detrimental components within the air inhaled by way of employees within the chemical and comparable operating environments is important to observe adherence to statutory focus limits and to guard the staff from the opposed results of such ingredients.
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Additional info for Analyses of Hazardous Substances in Air, Volume 5
Comments: The sophisticated measuring technique used in this procedure requires a great deal of practical experience with methods of sampling and analysis. During calibration, it is necessary to handle BCME. Because of the high toxicity of BCME, appropriate safety precautions must be taken . 05 L/min (e. g. PP1 from Gilian (supplier in Germany: GSM GmbH, Neuss-Norf)) Gas meter or digital flow meter for the set pump range (e. g. from Analyt GmbH, Mçllheim) Adsorption tubes made of glass or steel, standardised for automatic thermal desorption (e.
During working hours the pump and tube are worn by a person or used in a stationary position. After sampling, the tube is closed with caps. 1 Sample preparation and analysis The contents of the loaded Tenax tube are transferred to a 2 mL beaded rim vial and 1 mL of n-hexane is added. The beaded rim vial is closed and shaken for 30 minutes. 1 µL of the supernatant solution (desorption solution) is injected into the gas chromatograph.
With a 5 mL gas syringe 2 mL of BCME stock gas (for example) is diluted in a dry evacuated 1000 mL gas pipette as described above. 2 ng/mL. With a 20 mL gas syringe 20 mL (for example) of the BCME calibration gas produced is diluted in a dry evacuated 200 mL gas pipette as described above. 3 ng/mL. 1 mL of each of the calibration gases ± applied to adsorption tubes and then analysed ± produces signals corresponding to the quantification limit and ten times the quantification limit of BCME in air for an air sample volume of 3 L, i.