By Antonius Kettrup
This can be the 5th quantity in a global sequence of analytical equipment for the selection 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 dangerous ingredients within the air inhaled by means of staff within the chemical and related operating environments is critical to watch adherence to statutory focus limits and to guard the staff from the antagonistic results of such elements.
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Additional resources for Analyses of Hazardous Substances in Air, Volume 5
016 mg/m3 1,5-diaminonaphthalene for a 500 L air sample, 5 mL desorbate, dilution of the desorbate in a ratio of 1 : 1 v/v and 25 µL injection volume. 3 Selectivity Interfering components may cause too high values. In general, interferences can be eliminated by selecting different chromatography conditions. In practice the separation conditions described above have proved reliable. Analytical Methods 54 6 Discussion The loaded filters can be stored in the dark at room temperature for at least a week without any loss of adsorbed 1,5-diaminonaphthalene.
2 Sampling The flow rate of the pump is set to a maximum of 100 mL/min. With sampling for 8 hours this corresponds to a maximum air sample volume of 48 L. A Tenax tube is opened and connected to the pump. 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.
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).