title: Surface reaction rate and probability of ozone and alpha-terpineol on glass, polyvinyl chloride, and latex paint surfaces.
abstract: Ozone can react homogeneously with unsaturated organic compounds in buildings to generate undesirable products. However, these reactions can also occur on indoor surfaces, especially for low-volatility organics. Conversion rates of ozone with α-terpineol, a representative low-volatility compound, were quantified on surfaces that mimic indoor substrates. Rates were measured for α-terpineol adsorbed to beads of glass, polyvinylchloride (PVC), and dry latex paint, in a plug flow reactor. A newly defined second-order surface reaction rate coefficient, k(2), was derived from the flow reactor model. The value of k(2) ranged from 0.68 × 10(-14) cm(4)s(-1)molecule(-1) for α-terpineol adsorbed to PVC to 3.17 × 10(-14) cm(4)s(-1)molecule(-1) for glass, but was insensitive to relative humidity. Further, k(2) is only weakly influenced by the adsorbed mass but instead appears to be more strongly related to the interfacial activity α-terpineol. The minimum reaction probability ranged from 3.79 × 10(-6) for glass at 20% RH to 6.75 × 10(-5) for PVC at 50% RH. The combination of high equilibrium surface coverage and high reactivity for α-terpineol suggests that surface conversion rates are fast enough to compete with or even overwhelm other removal mechanisms in buildings such as gas-phase conversion and air exchange.
authors.affiliation: Department of Civil, Agriculture, and Environmental Engineering, Missouri University of Science and Technology, Rolla, Missouri 65401, USA.
authors.forename: Shi
authors.initials: S
authors.lastname: Shu
authors.forename: Glenn C
authors.initials: GC
authors.lastname: Morrison
mesh_terms: D000327:Adsorption; D000393:Air Pollutants / Q000737:chemistry*; D016902:Air Pollution, Indoor / Q000706:statistics & numerical data; D000081005:Cyclohexane Monoterpenes; D053138:Cyclohexenes / Q000737:chemistry*; D005898:Glass / Q000737:chemistry*; D007840:Latex / Q000737:chemistry*; D039821:Monoterpenes / Q000737:chemistry*; D010126:Ozone / Q000737:chemistry*; D010150:Paint; D011143:Polyvinyl Chloride / Q000737:chemistry*; D011336:Probability; D013499:Surface Properties
chemical_list: D000393:Air Pollutants; D000081005:Cyclohexane Monoterpenes; D053138:Cyclohexenes; D007840:Latex; D039821:Monoterpenes; C016775:alpha-terpineol; D010126:Ozone; D011143:Polyvinyl Chloride