Abstract
Human surfaces have a significant influence on indoor air due to their interaction with ozone. The oxidation products of unsaturated fatty acids and triglycerides have not been systematically studied. In this investigation, the kinetic model (KM-SUB-Skin-Clothing) was used to simulate the interaction of ozone and human skin lipids, including squalene, unsaturated fatty acids and triglycerides for typical residential rooms. Based on a theoretical reaction mechanism, 21 volatile products and their concentrations were determined. The results indicate that acetone was the most abundant anticipated product, followed by 6-MHO, geranyl acetone, 4-OPA, and heptanal. When the window was closed, the sum of concentration of volatile products increased sharply and became higher than ozone over 1 h. The concentration of carbonyls was 3–6 ppb (∼2–8 times) higher than dicarbonyls. Total volatile products generated from squalene was 3–5 ppb (∼3–5 times) higher than those generated from unsaturated fatty acids and triglycerides.
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