Emission characteristics of diethylhexyl phthalate (DEHP) from building materials determined using a passive flux sampler and micro-chamber

Emission rates of diethylhexyl phthalate (DEHP) from building materials, such as vinyl floorings and wall paper, determined using a passive flux sampler (PFS) were constant over the week-long measurement period. Emission rates for vinyl floorings and wallpaper were linearly correlated to the inverse of diffusion distance, which corresponds to the internal depth of the PFS. Surface-air DEHP concentrations (y(0)) were estimated as 1.3–2.3 μg/m(3) for materials having a boundary layer molecular diffusion rate-limiting step. The partition coefficient (K(material-air)) was estimated as 3.3–7.5 × 10(10) for these materials. Additionally, emission rates of DEHP from same building materials determined using a micro-chamber were 4.5–6.1 μg/m(2)/h. Mass transfer coefficients in the micro-chamber (h(m)) were estimated by comparing the results using the PFS and micro-chamber, and these were 1.1–1.2 × 10(−3) and 8.1 × 10(−4) m/s for vinyl floorings (smooth surface) and wallpaper (rough surface), respectively. The thickness of boundary layer on the surface of building materials in the micro-chamber were estimated to be 2.5–2.6 and 3.7 mm for vinyl floorings and wallpaper, respectively.