PDF(Pubmed)
Abstract：
The use of household bleach cleaning products results in emissions of highly oxidative gaseous species, such as hypochlorous acid (HOCl) and chlorine (Cl2). These species readily react with volatile organic compounds (VOCs), such as limonene, one of the most abundant compounds found in indoor enviroments. In this study, reactions of HOCl/Cl2 with limonene in the gas phase and on indoor relevant surfaces were investigated. Using an environmental Teflon chamber, we show that silica (SiO2), a proxy for window glass, and rutile (TiO2), a component of paint and self-cleaning surfaces, act as a reservoir for adsorption of gas-phase products formed between HOCl/Cl2 and limonene. Furthermore, high-resolution mass spectrometry (HRMS) shows that the gas-phase reaction products of HOCl/Cl2 and limonene readily adsorb on both SiO2 and TiO2. Surface-mediated reactions can also occur, leading to the formation of new chlorine- and oxygen-containing products. Transmission Fourier-transform infrared (FTIR) spectroscopy of adsorption and desorption of bleach and terpene oxidation products indicates that these chlorine- and oxygen-containing products strongly adsorb on both SiO2 and TiO2 surfaces for days, providing potential sources of human exposure and sinks for additional heterogeneous reactions.
摘要：
家用漂白清洁产品的使用导致高度氧化的气态物质的排放，例如次氯酸(HOCl)和氯气(Cl2)。这些物种容易与挥发性有机化合物（VOC）反应，比如柠檬烯,室内环境中最丰富的化合物之一。在这项研究中,研究了HOCl/Cl2与柠檬烯在气相和室内相关表面上的反应。使用环境特氟龙室，我们表明二氧化硅(SiO2)，窗户玻璃的代理，和金红石（TiO2），油漆和自清洁表面的组成部分，充当吸附HOCl/Cl2和柠檬烯之间形成的气相产物的储层。此外，高分辨率质谱（HRMS）表明，HOCl/Cl2和柠檬烯的气相反应产物容易吸附在SiO2和TiO2上。表面介导的反应也可能发生，导致形成新的含氯和含氧产品。漂白剂和萜烯氧化产物的吸附和解吸的透射傅里叶变换红外（FTIR）光谱表明，这些含氯和含氧产物在SiO2和TiO2表面上强烈吸附了几天，为其他非均相反应提供人类暴露的潜在来源和汇。
