By Antonius Kettrup
This can be the 5th quantity in a global sequence of analytical tools for the selection of toxicants within the air on the office. All equipment are trustworthy, reproducable and meet the necessities for quality controls. The research of the degrees of detrimental elements within the air inhaled via employees within the chemical and comparable operating environments is important to watch adherence to statutory focus limits and to guard the employees from the hostile results of such ingredients.
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Additional resources for Analyses of Hazardous Substances in Air, Volume 5
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.
Apparatus: Pump, gas meter or flow meter, activated carbon tubes, gas chromatograph with flame ionisation detector (FID). 3 Solutions a,a-Dichlorotoluene stock solution I: Solution of 10 mg/mL a,a-dichlorotoluene in carbon disulfide. 100 mg of a,a-dichlorotoluene is dissolved in carbon disulfide in a 10 mL volumetric flask and the flask is filled to the mark with carbon disulfide. 05 mg/mL a,a-dichlorotoluene in carbon disulfide. 50 µL of a,a-dichlorotoluene stock solution I is pipetted into a 10 mL volumetric flask and the flask is filled to the mark with carbon disulfide.