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 quality controls. The research of the degrees of dangerous elements within the air inhaled through employees within the chemical and related operating environments is important to watch adherence to statutory focus limits and to guard the staff from the hostile results of such elements.
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Additional info for Analyses of Hazardous Substances in Air, Volume 5
To ensure that the desorption solvent and the Tenax tube do not contain any impurities, the filling of an unloaded Tenax tube is treated with 1 mL of n-hexane (blank solution). 1 µL of the blank solution is injected into the gas chromatograph. 5 min Helium, approx. 1 Calibration 1 mL of each of the calibration solutions described in Sect. 3 are added to the contents of an unloaded Tenax tube in beaded rim vials and analysed as described in Sect. 1. Analytical Methods 44 The calibration curve is obtained by plotting the measured peak areas or peak heights against the a-chlorotoluene weights contained in the various calibration solutions.
For each calibration gas concentration, the selected calibration ion masses for BCME and MIBK are recorded automatically and the peak areas calculated. To determine the calibration factors the mean values of the six individual determinations are used. The calibration factor is determined using the peak areas calculated for BCME and the internal standard MIBK according to Equation (1): f Fisc Á w Fc Á wis 1 Legend: f Calibration factor for BCME Fc Peak area of the BCME ion mass m/z 79 in the mass chromatogramme of the calibration tube Fisc Peak area of the MIBK ion mass m/z 43 in the mass chromatogramme of the calibration tube w Weight of BCME contained in 1 mL of calibration gas wis Weight of MIBK contained in 1 mL of calibration gas If the calibration factors for the two BCME calibration masses differ by less than 10 %, the mean value can be used.
2 Calculation of the analytical result Quantitative evaluation of the chromatogrammes is carried out according to the external standard method. 1 Accuracy and recovery To determine the relative standard deviation of the method, different weights of a-chlorotoluene were each loaded onto six Tenax tubes by means of a syringe. 5 µL stock solution and 1 µL stock solution. Under the sampling conditions described in Sect. 2, 48 L of air were drawn through each of the tubes. The tubes were then analysed.