Edited by Antonius Kettrup's Analysis of Hazardous Substances in Air PDF

By Edited by Antonius Kettrup

ISBN-10: 3527270531

ISBN-13: 9783527270538

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Example text

In the first step the substances in the air are deposited in the collection system and in a second step extracted from it. Tenax has proved to be an ideal collection phase. Tenax adsorption tubes are also suitable for collecting gaseous and particle-bound residues of other pesticides from the air [2]. Care must be taken when determining the recovery that the solution is added to the middle of the tube and that the spiked volume is 10±50 µL. Smaller volumes increase the inaccuracy of the dose, larger volumes lead, however, to increased substance losses during removal of the solvent.

1 value outside of the control limits 2. 7 consecutive values on one side of the central line 3. 7 consecutive values with increasing tendency 4. 7 consecutive values with decreasing tendency 5. 2 of 3 consecutive values outside of the warning range 6. 10 of 11 consecutive values on one side of the central line Fig. 2. Unusual entries in the Shewhart card which require investigation. ); (d) Many entries close to the control levels (S increased). 5 Control cards for some control parameters Below are examples of control cards for some control parameters.

For sampling, air is drawn through the adsorption tube at a flow rate of 2 L/min for six hours. After sampling, the air sample volume is noted. In addition, the parameters important for determining the concentration such as temperature and air pressure at the site of sampling must be determined. The closed tubes should be stored in a refrigerator until sample preparation is performed. For preparation, the collection phase and the control phase are each transferred separately to 20 mL flanged vials; the cotton wool separating the two phases and the upper piece of cotton wool at the tube inlet are analysed together with the collection phase.

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Analysis of Hazardous Substances in Air by Edited by Antonius Kettrup

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