Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
University of Chinese Academy of Sciences, Beijing 100049, China.
Environ Sci Technol. 2021 Jan 5;55(1):230-239. doi: 10.1021/acs.est.0c05964. Epub 2020 Dec 13.
The presence of anthropogenically emitted chlorinated paraffins (CPs) has been reported in the pristine regions, providing evidence of their long-range transport. This study comprehensively analyzed the short-chain chlorinated paraffins (SCCPs) and medium-chain chlorinated paraffins (MCCPs) in both gas and particle phases at King George Island, West Antarctica (the Chinese Great Wall Station), from 2014 to 2018. The atmospheric levels of CPs ranged between 71.4 and 4230 pg/m, with an increasing temporal trend during the sampling time. Three different models (J-P model, H-B model, and L-M-Y model) were built to estimate the progress of gas/particle partitioning of CPs at the measurement site. Furthermore, we compared the measured data of the gas/particle partitioning with the data estimated using three different models. We found that the steady-state model (L-M-Y model) was more suitable for investigating the gas/particle partitioning of CPs instead of equilibrium state models (J-P model and H-B model). The result indicated that steady-state approximation rather than the equilibrium state represents the most predominant contribution to the transport of CPs to the Antarctic region. The steady-state further made it conducive to sustaining the levels of CPs for a more extended period in the atmosphere of West Antarctica.
已在原始地区报告了人为排放的氯化石蜡（CPs）的存在，这为它们的长距离传输提供了证据。本研究于 2014 年至 2018 年期间在南极洲西部的乔治王岛（中国长城站）全面分析了气相和颗粒相中的短链氯化石蜡（SCCPs）和中链氯化石蜡（MCCPs）。CPs 的大气浓度范围为 71.4 至 4230 pg/m，在采样期间呈上升趋势。建立了三个不同的模型（J-P 模型、H-B 模型和 L-M-Y 模型）来估计测量点处 CPs 的气/粒分配的进展。此外，我们将气/粒分配的实测数据与三个不同模型估计的数据进行了比较。我们发现，稳态模型（L-M-Y 模型）比平衡态模型（J-P 模型和 H-B 模型）更适合研究 CPs 的气/粒分配。结果表明，稳态近似而不是平衡态是 CPs 向南极地区传输的主要贡献。稳态进一步有利于在南极洲西部大气中维持更长时间的 CPs 水平。
