Abstract

To accurately measure Cl2 mixing ratio using stack emission monitors and leak monitoring sensors in a workplace, it is essential calibrating monitors and sensors periodically using a Cl2 standard gas mixture. Because there is no reliable analytical technique for Cl2, an international standard for high-pressure Cl2 gas mixtures has not been established. A novel approach for the quantification of Cl2 was developed using quadrupole mass spectrometry (QMS) with an expanded uncertainty of 0.7 μmol mol−1. A 100 μmol mol−1 chlorine (Cl2)/N2 gas mixture was produced through a two-step procedure involving dilution of Cl2 with N2 in high-pressure aluminum cylinders. To check the consistency between 100 μmol mol−1 Cl2 gas mixtures in different cylinders, Cl2 gas mixtures were quantified using the QMS based approach. It was found that four cylinders of 100 μmol mol−1 Cl2 gas mixtures prepared in 2016 agreed within 0.7 μmol mol−1. The long-term stability of 100 μmol mol−1 Cl2 gas mixtures was assessed through changes in the Cl2 mixing ratio over a one-year. It was found that the 100 μmol mol−1 Cl2 gas mixture was stable within ±0.7 μmol mol−1 over one year. Finally, 100 μmol mol−1 Cl2/N2 gas mixture was successfully developed in a high pressure cylinder with an expanded uncertainty of 2.0 μmol mol−1 (k = 2; 95% confidence level).

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