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Measurements and modeling of absorptive partitioning of volatile organic compounds to painted surfaces
Author(s) -
Algrim Lucas B.,
Pagonis Demetrios,
Gouw Joost A.,
Jimenez Jose L.,
Ziemann Paul J.
Publication year - 2020
Publication title -
indoor air
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.387
H-Index - 99
eISSN - 1600-0668
pISSN - 0905-6947
DOI - 10.1111/ina.12654
Subject(s) - volatilisation , volatile organic compound , chemistry , saturation (graph theory) , analytical chemistry (journal) , mass spectrometry , environmental chemistry , chromatography , organic chemistry , mathematics , combinatorics
Partitioning to surfaces is an important sink for volatile organic compounds (VOCs) indoors, but the mechanisms are not well understood or quantified. Here, a mass spectrometer was coupled to a portable surface reactor and a flow tube to measure partitioning of VOCs into paint films coated onto glass or wallboard, and their subsequent diffusion. A model was developed to extract values of the effective absorbing organic mass concentration of the film, C w , which is a measure of absorption capacity, and VOC diffusion coefficients, D f , from VOC time profiles measured during film passivation and depassivation. Values of C w agreed well with the value estimated from the paint film mass and flow tube air volume, and D f values (also measured using attenuated total reflectance‐Fourier transform infrared spectroscopy) correlated well with VOC vapor saturation concentrations, C *, estimated using a group contribution method. The value of these relationships for estimating key parameters that control VOC partitioning into paint and the fate of VOCs indoors was demonstrated using a house model, which indicated that >50% of VOCs with C * ≤10 8 μg/m 3 ( C * of octane, hexanone, and propanol) that contacted a paint film of typical thickness fully permeated the film regardless of emission duration.