By Antonius Kettrup
This is often the 5th quantity in a global sequence of analytical equipment 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 harmful components within the air inhaled through staff within the chemical and related operating environments is critical to observe adherence to statutory focus limits and to guard the staff from the antagonistic results of such ingredients.
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Extra info for Analyses of Hazardous Substances in Air, Volume 5
The ion mass m/z 49, the intensity of which is like that of m/z 79, often has a better signal:noise ratio. 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.
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. The stock solution and calibration solutions are not stable and must be freshly prepared before use.
G. from Aldrich, 89552 Steinheim) Aqueous ammonia, 25 %, analytical grade (e. g. from Merck, 64271 Darmstadt) Hydrochloric acid, 32 %, analytical grade (e. g. from Merck, 64271 Darmstadt) For HPLC: Ultra pure water (e. g. prepared with the Nanopure II (UHQ water)) Acetonitrile, LiChrosolv (e. g. 3 Solutions Desorption solution: Mixture of 92 parts by volume of acetonitrile and 8 parts by volume of aqueous ammonia. Solvent mixture 1: Mixture of acetonitrile/water (1 : 1 v/v). Solvent mixture 2: Mixture of 96 parts by volume of solvent mixture 1 and 8 parts by volume of aqueous ammonia.
Analyses of Hazardous Substances in Air, Volume 5 by Antonius Kettrup