By Antonius Kettrup
This can be the 5th quantity in a world sequence of analytical equipment for the selection of toxicants within the air on the office. All equipment are trustworthy, reproducable and meet the necessities for qc. The research of the degrees of dangerous components within the air inhaled through staff 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 elements.
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Extra info for Analyses of Hazardous Substances in Air, Volume 5
The flow rate is set to about 4 L/h. 1 Sample preparation and analysis The contents of the loaded activated carbon tube are transferred to a 2 mL sample vial and desorbed with 1 mL of carbon disulfide (desorption solution). After desorption of the activated carbon with carbon disulfide, the solution must immediately be analysed by gas chromatography, as the solution is instable. To ensure that the carbon disulfide and the activated carbon do not contain any impurities, the filling of an unloaded activated carbon tube is desorbed with 1 mL of carbon disulfide (blank solution).
The flask is filled to the mark with the solvent mixture 2. 0, 5, 10, 15, 20 and 25 mg of 1,5-diaminonaphthalene per millilitre solvent mixture 1. A few millilitres of solvent mixture 1 are added to each 10 mL volumetric flask. Then 5, 10, 50, 100, 150, 200 and 250 µL of the stock solution are each pipetted into one of the volumetric flasks and then the flasks are filled to the mark with solvent mixture 1. With these solutions and an air sample volume of 500 L a 1,5-diaminonaphthalene concentration range of 10 to 500 µg/m3 is covered.
58 mg BCME, are injected with a microlitre syringe into a dry evacuated 1000 mL gas pipette which is then filled with dry nitrogen. 3 ng/mL BCME. 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.
Analyses of Hazardous Substances in Air, Volume 5 by Antonius Kettrup