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 office. All tools are trustworthy, reproducable and meet the necessities for quality controls. The research of the degrees of detrimental ingredients within the air inhaled by way of employees within the chemical and comparable operating environments is important to watch adherence to statutory focus limits and to guard the staff from the hostile results of such ingredients.

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Additional resources for Analyses of Hazardous Substances in Air, Volume 5

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Approx. 1 mg. The volumetric flask is filled to the mark with n-hexane. 4 mg/mL and 1 mg/mL a,a-dichlorotoluene in n-hexane. 5 mL, 2 mL and 5 mL of the a,a-dichlorotoluene stock solution are each transferred to 50 mL volumetric flasks already containing about 10 mL of n-hexane. The volumetric flasks are filled to the mark with n-hexane. With these solutions and an air sample volume of 48 L and 1 mL of desorption solution a concentration range of 21 µg/m3 to 21 mg/m3 a,a-dichlorotoluene in air is covered.

E. 66 µL/m3 (ppb) MIBK. 58 µg/mL BCME. 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.

The quantification limit does not change significantly when this alternative ion is used. The MIBK ion mass m/z 43 is evaluated as internal standard. The accompanying mass m/z 58 serves as a control; its intensity must be about 25 % of that of the ion mass m/z 43. If this is not the case, interfering components prevent the determination of MIBK. Analytical Methods 34 The calibration curve, determined using the most intensive ion masses in the mass spectrum, m/z 79 for BCME and m/z 43 for MIBK, corresponding to the quantification limit for BCME, ten times the quantification limit and one hundred times the quantification limit, is not linear.

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