Li Hai-Ling, Yang Pu-Fei, Liu Li-Yan, Gong Bei-Bei, Zhang Zi-Feng, Ma Wan-Li, Macdonald Robie W, Nikolaev Anatoly N, Li Yi-Fan
International Joint Research Center for Persistent Toxic Substances (IJRC-PTS), State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology (HIT), Harbin 150090, China.
International Joint Research Center for Arctic Environment and Ecosystem (IJRC-AEE), Polar Academy/School of Environment, HIT, Harbin 150090, China.
Environ Sci Technol. 2022 Jun 21;56(12):8373-8383. doi: 10.1021/acs.est.1c07819. Epub 2022 May 30.
Indoor semivolatile organic compounds (SVOCs), present in the air, airborne particles, settled dust, and other indoor surfaces, can enter the human body through several pathways. Knowing the partitioning between gaseous and particulate phases is important in identifying specific pathway contributions and thereby accurately assessing human exposure. Numerous studies have developed equilibrium equations to predict airborne particle/gas (P/G) partitioning in air () and dust/gas (D/G) partitioning in settled dust (). The assumption that P/G and D/G equilibria are instantaneous for airborne and settled dust phases, commonly adopted by current indoor fate models, is not likely valid for compounds with high octanol-air partition coefficients (). Here, we develop steady-state based equations to predict and in the indoor environment. Results show that these equations perform well and are verified by worldwide monitoring data. It is suggested that instantaneous steady state could work for P/G and D/G partitioning of SVOCs in indoor environments, and the equilibrium is just a special case of the steady state when log < 11.38 for P/G partitioning and log < 10.38 for D/G partitioning. These newly developed equations and methods provide a tool for more accurate assessment for human exposure to SVOCs in the indoor environment.
室内空气中、空气传播颗粒、沉降灰尘及其他室内表面中存在的半挥发性有机化合物（SVOCs）可通过多种途径进入人体。了解气相和颗粒相之间的分配情况对于确定特定途径的贡献从而准确评估人体暴露至关重要。众多研究已开发出平衡方程来预测空气中的空气传播颗粒/气体（P/G）分配及沉降灰尘中的灰尘/气体（D/G）分配。当前室内归宿模型通常采用的P/G和D/G平衡对于空气传播和沉降灰尘相而言是瞬时的这一假设，对于具有高正辛醇 - 空气分配系数的化合物可能并不成立。在此，我们开发了基于稳态的方程来预测室内环境中的 和 。结果表明这些方程表现良好且得到了全球监测数据的验证。建议瞬时稳态可用于室内环境中SVOCs的P/G和D/G分配，并且当P/G分配的log < 11.38以及D/G分配的log < 10.38时，平衡只是稳态的一种特殊情况。这些新开发的方程和方法为更准确评估人体在室内环境中对SVOCs的暴露提供了一种工具。
