Gas-phase and transpiration-driven mechanisms for volatilization through wetland macrophytes

Matthew C. Reid, Peter R. Jaffe

Research output: Contribution to journalArticle

15 Scopus citations

Abstract

Natural and constructed wetlands have gained attention as potential tools for remediation of shallow sediments and groundwater contaminated with volatile organic compounds (VOCs). Wetland macrophytes are known to enhance rates of contaminant removal via volatilization, but the magnitude of different volatilization mechanisms, and the relationship between volatilization rates and contaminant physiochemical properties, remain poorly understood. Greenhouse mesocosm experiments using the volatile tracer sulfur hexafluoride were conducted to determine the relative magnitudes of gas-phase and transpiration-driven volatilization mechanisms. A numerical model for vegetation-mediated volatilization was developed, calibrated with tracer measurements, and used to predict plant-mediated volatilization of common VOCs as well as quantify the contribution of different volatilization pathways. Model simulations agree with conclusions from previous work that transpiration is the main driver for volatilization of VOCs, but also demonstrate that vapor-phase transport in wetland plants is significant, and can represent up to 50% of the total flux for compounds with greater volatility like vinyl chloride.

Original languageEnglish (US)
Pages (from-to)5344-5352
Number of pages9
JournalEnvironmental Science and Technology
Volume46
Issue number10
DOIs
StatePublished - May 15 2012

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Environmental Chemistry

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