Journal article
Multiphase Chemistry Controls Inorganic Chlorinated and Nitrogenated Compounds in Indoor Air during Bleach Cleaning
Environmental science & technology, v 54(3), pp 1730-1739
04 Feb 2020
PMID: 31940195
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
We report elevated levels of gaseous inorganic chlorinated and nitrogenated compounds in indoor air while cleaning with a commercial bleach solution during the House Observations of Microbial and Environmental Chemistry field campaign in summer 2018. Hypochlorous acid (HOCl), chlorine (Cl
), and nitryl chloride (ClNO
) reached part-per-billion by volume levels indoors during bleach cleaning-several orders of magnitude higher than typically measured in the outdoor atmosphere. Kinetic modeling revealed that multiphase chemistry plays a central role in controlling indoor chlorine and reactive nitrogen chemistry during these periods. Cl
production occurred via heterogeneous reactions of HOCl on indoor surfaces. ClNO
and chloramine (NH
Cl, NHCl
, NCl
) production occurred in the applied bleach via aqueous reactions involving nitrite (NO
) and ammonia (NH
), respectively. Aqueous-phase and surface chemistry resulted in elevated levels of gas-phase nitrogen dioxide (NO
). We predict hydroxyl (OH) and chlorine (Cl) radical production during these periods (10
and 10
molecules cm
s
, respectively) driven by HOCl and Cl
photolysis. Ventilation and photolysis accounted for <50% and <0.1% total loss of bleach-related compounds from indoor air, respectively; we conclude that uptake to indoor surfaces is an important additional loss process. Indoor HOCl and nitrogen trichloride (NCl
) mixing ratios during bleach cleaning reported herein are likely detrimental to human health.
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Details
- Title
- Multiphase Chemistry Controls Inorganic Chlorinated and Nitrogenated Compounds in Indoor Air during Bleach Cleaning
- Creators
- James M Mattila - Colorado State UniversityPascale S J Lakey - University of California, IrvineManabu Shiraiwa - University of California, IrvineChen Wang - University of TorontoJonathan P D Abbatt - University of TorontoCaleb Arata - University of California, BerkeleyAllen H Goldstein - University of California, BerkeleyLaura Ampollini - Drexel UniversityErin F Katz - Drexel UniversityPeter F DeCarlo - Drexel UniversityShan Zhou - Syracuse UniversityTara F Kahan - University of SaskatchewanFelipe J Cardoso-Saldaña - The University of Texas at AustinLea Hildebrandt Ruiz - The University of Texas at AustinAndrew Abeleira - Colorado State UniversityErin K Boedicker - Colorado State UniversityMarina E Vance - University of Colorado BoulderDelphine K Farmer - Colorado State University
- Publication Details
- Environmental science & technology, v 54(3), pp 1730-1739
- Publisher
- American Chemical Society; Washington, DC
- Number of pages
- 10
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Civil, Architectural, and Environmental Engineering; Chemistry
- Web of Science ID
- WOS:000511508500046
- Scopus ID
- 2-s2.0-85079023037
- Other Identifier
- 991019168777504721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Engineering, Environmental
- Environmental Sciences