Indoor air pollution has emerged as major environmental risks and health concern. In this work, we employed ATR-IR, mass spec and DTT assay to investigate ozone interaction with squalene, major composition of skin oil and the roles of environmental conditions including temperature and relative humidity in the interfacial ozone chemistry. Results show heterogeneous oxidation is very rapid and proceeds via ozonolysis mechanism. Overall ozone reactive uptake is nearly independent of ambient temperature and relativity humidity. In contrast, temperature seemingly affects reaction product formation. DTT assay reveals that redox activity of resulting products is significantly enhanced upon ozone exposure and increases with increasing exposure time. Further water uptake study reveals that ozone exposure enhances hydrophilicity of reaction products. The changes in redox activity and hydrophilicity pose higher risk for public health.

Interfacial ozone oxidation of squalene and its potential health impact

247th National Meeting (2014)

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