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Levels of Volatile Methyl Siloxanes in Outdoor Air

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Volatile Methylsiloxanes in the Environment

Part of the book series: The Handbook of Environmental Chemistry ((HEC,volume 89))

Abstract

Field data showing volatile methyl siloxane (VMS) concentrations in the atmosphere is still limited. Outdoor air concentrations are highly conditioned by population, being VMS values much higher in urban locations than in remote regions, generally in the range of ng m−3, one to three orders of magnitude lower than other volatile organic compounds commonly found in the atmosphere. Cyclic VMS (cVMS) are the most abundant compounds, with concentrations up to 2–3 orders of magnitude higher than those of the linear VMS (lVMS). This abundance is related to the large production and use of cVMS globally. In urban areas, lVMS are generally in the range of 1–20 ng m−3. On the other hand, cVMS present much higher concentrations, ranging from a few hundred to several thousand ng m−3. A limited number of studies evaluating VMS in outdoor air include background and rural locations. Background regions generally present VMS levels one order of magnitude lower than those usually found in urban areas, with lVMS concentrations between 0.01 and 1 ng m−3. In contrast, cVMS concentrations range from 1 to 100 of ng m−3. In the Arctic, lVMS are seldom observed, but cVMS are usually found in the range of 0.1 and 4 ng m−3. The regulation and establishment of air quality criterions for VMS are still very limited worldwide. Evaluations regarding human and environmental exposure to these compounds would be mandatory in the future, as well as the establishment of air quality standards.

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  1. Laboratori del Centre de Medi Ambient, Escola Tècnica Superior d’Enginyeria Industrial de Barcelona (ETSEIB), Universitat Politècnica de Catalunya (LCMA-UPC), Barcelona, Spain

    Eva Gallego, Francisco Javier Roca & José Francisco Perales

  2. Centres Científics i Tecnològics, Universitat de Barcelona (CCiTUB), Barcelona, Spain

    Pilar Teixidor

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  1. Eva Gallego
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  3. Francisco Javier Roca
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  4. José Francisco Perales
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Correspondence to Eva Gallego .

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  1. LEPABE – Laboratory for Process Engineering, Environment, Biotechnology and Energy, Faculty of Engineering, University of Porto, Porto, Portugal

    Vera Homem

  2. LEPABE – Laboratory for Process Engineering, Environment, Biotechnology and Energy, Faculty of Engineering, University of Porto, Porto, Portugal

    Nuno Ratola

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Gallego, E., Teixidor, P., Roca, F.J., Perales, J.F. (2018). Levels of Volatile Methyl Siloxanes in Outdoor Air. In: Homem, V., Ratola, N. (eds) Volatile Methylsiloxanes in the Environment. The Handbook of Environmental Chemistry, vol 89. Springer, Cham. https://doi.org/10.1007/698_2018_343

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