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Formation and emission of hydrogen chloride in indoor air

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Date

2018-10-04

Authors

Dawe, Kathryn E R
Furlani, Teles C
Kowal, Shawn F
Kahan, Tara F
VandenBoer, Trevor C
Young, Cora J

Journal Title

Journal ISSN

Volume Title

Publisher

Wiley

Abstract

To improve our understanding of chlorine chemistry indoors, reactive chlorine species such as hydrogen chloride (HCl) must be analyzed using fast time-response measurement techniques. Although well studied outdoors, sources of HCl indoors are unknown. In this study, mixing ratios of gaseous HCl were measured at 0.5 Hz in the indoor environment using a cavity ring-down spectroscopy (CRDS) instrument. The CRDS measurement rate provides a major advance in observational capability compared to other established techniques. Measurements of HCl were performed during three types of household activities: (1) floor exposure to bleach, (2) chlorinated and non-chlorinated detergent use in household dishwashers, and (3) cooking events. Surface application of bleach resulted in a reproducible increase of 0.1 ppbv in the affected room. Emissions of HCl from automated dishwashers were observed only when chlorinated detergents were used, with additional HCl emitted during the drying cycle. Increased mixing ratios of HCl were also observed during meal preparation on an electric element stovetop. These observations of HCl derived from household activities indicate either direct emission or secondary production of HCl via chlorine atoms is possible. Calculations of photolysis rate constants of chlorine atom precursors provide evidence that photolysis may contribute to indoor HCl levels.

Description

Keywords

cavity ring-down spectroscopy, real-time measurements, reactive chlorine, bleach, cooking, hydrochloric acid

Citation

Dawe, K.E.R., Furlani, T.C., Kowal, S.F., Kahan, T.F., VandenBoer, T.C., Young, C.J.* 2019 Formation and emission of hydrogen chloride in indoor air. Indoor Air 29:70-78, doi:10.1111/ina.12509.