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Observations and impacts of bleach washing on indoor chlorine chemistry

Wong, J. P. S. and Carslaw, N. and Zhao, R. and Zhou, S. and Abbatt, J. P. D. (2017) Observations and impacts of bleach washing on indoor chlorine chemistry. Indoor Air, 27 (6). pp. 1082-1090. ISSN 0905-6947.

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Ambient levels of chlorinated gases and aerosol components were measured by on-line chemical ionization and aerosol mass spectrometers after an indoor floor was repeatedly washed with a commercial bleach solution. Gaseous chlorine (Cl_2, 10′s of ppbv) and hypochlorous acid (HOCl, 100′s of ppbv) arise after floor washing, along with nitryl chloride (ClNO_2), dichlorine monoxide (Cl2O) and chloramines (NHCl_2, NCl_3). Much higher mixing ratios would prevail in a room with lower and more commonly encountered air exchange rates than that observed in the study (12.7 h^(−1)). Coincident with the formation of gas-phase species, particulate chlorine levels also rise. Cl_2, ClNO_2, NHCl_2 and NCl_3 exist in the headspace of the bleach solution whereas HOCl was only observed after floor washing. HOCl decays away 1.4 times faster than the air exchange rate, indicative of uptake onto room surfaces and consistent with the well-known chlorinating ability of HOCl. Photochemical box modeling captures the temporal profiles of Cl_2 and HOCl very well, and indicates that the OH, Cl and ClO gas-phase radical concentrations in the indoor environment could be greatly enhanced (> 10^6 and 10^5 cm^(−3) for OH and Cl, respectively) in such washing conditions, dependent on the amount of indoor illumination.

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Additional Information:© 2017 Wiley. Issue online: 12 October 2017; Version of record online: 26 July 2017; Accepted manuscript online: 24 June 2017; Manuscript Accepted: 16 June 2017; Manuscript Received: 14 February 2017. Financial support from the Alfred P. Sloan Foundation is acknowledged. The help of S. Abbatt is acknowledged for measuring the active chlorine concentrations in the bleach solution.
Funding AgencyGrant Number
Alfred P. Sloan FoundationUNSPECIFIED
Subject Keywords:bleach; chlorine; hypochlorous acid; indoor air; indoor chlorine chemistry; oxidation
Issue or Number:6
Record Number:CaltechAUTHORS:20170628-142454937
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Official Citation:Wong JPS, Carslaw N, Zhao R, Zhou S, Abbatt JPD. Observations and impacts of bleach washing on indoor chlorine chemistry. Indoor Air. 2017;27:1082–1090.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:78667
Deposited By: Tony Diaz
Deposited On:28 Jun 2017 21:36
Last Modified:03 Oct 2019 18:10

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