Kristensen Kasper, Lunderberg David M, Liu Yingjun, Misztal Pawel K, Tian Yilin, Arata Caleb, Nazaroff William W, Goldstein Allen H
Department of Environmental Science, Policy, and Management, University of California, Berkeley, 94720 California, United States.
Now at Department of Biological and Chemical Engineering, Aarhus University, 8000 Aarhus C, Denmark.
Environ Sci Technol. 2023 Feb 28;57(8):3260-3269. doi: 10.1021/acs.est.2c07172. Epub 2023 Feb 16.
Semivolatile organic compounds (SVOCs) represent an important class of indoor pollutants. The partitioning of SVOCs between airborne particles and the adjacent air influences human exposure and uptake. Presently, little direct experimental evidence exists about the influence of indoor particle pollution on the gas-particle phase partitioning of indoor SVOCs. In this study, we present time-resolved gas- and particle-phase distribution data for indoor SVOCs in a normally occupied residence using semivolatile thermal desorption aerosol gas chromatography. Although SVOCs in indoor air are found mostly in the gas phase, we show that indoor particles from cooking, candle use, and outdoor particle infiltration strongly affect the gas-particle phase distribution of specific indoor SVOCs. From gas- and particle-phase measurements of SVOCs spanning a range of chemical functionalities (alkanes, alcohols, alkanoic acids, and phthalates) and volatilities (vapor pressures from 10 to 10 atm), we find that the chemical composition of the airborne particles influences the partitioning of individual SVOC species. During candle burning, the enhanced partitioning of gas-phase SVOCs to indoor particles not only affects the particle composition but also enhances surface off-gassing, thereby increasing the total airborne concentration of specific SVOCs, including diethylhexyl phthalate.
半挥发性有机化合物（SVOCs）是一类重要的室内污染物。SVOCs在空气中的颗粒物与相邻空气之间的分配会影响人体暴露和吸收。目前，关于室内颗粒物污染对室内SVOCs气-粒相分配的影响，几乎没有直接的实验证据。在本研究中，我们使用半挥发性热解吸气溶胶气相色谱法，给出了正常居住住宅内室内SVOCs的时间分辨气相和颗粒相分布数据。尽管室内空气中的SVOCs大多存在于气相中，但我们表明，烹饪、使用蜡烛以及室外颗粒物渗透产生的室内颗粒物会强烈影响特定室内SVOCs的气-粒相分布。通过对一系列化学官能团（烷烃、醇类、链烷酸和邻苯二甲酸盐）和挥发性（蒸气压从10到10 atm）的SVOCs进行气相和颗粒相测量，我们发现空气中颗粒物的化学成分会影响单个SVOC物种的分配。在蜡烛燃烧过程中，气相SVOCs向室内颗粒物的分配增强，这不仅会影响颗粒物的组成，还会增强表面脱气，从而增加特定SVOCs（包括邻苯二甲酸二乙基己酯）在空气中的总浓度。
