School of Environment, Guangdong Key Laboratory of Environmental Pollution and Health, Jinan University, Guangzhou, 510632, China.
School of Environmental Science and Engineering and Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou, 510006, China.
Environ Pollut. 2021 Jul 15;281:117025. doi: 10.1016/j.envpol.2021.117025. Epub 2021 Mar 27.
Although the occurrence and distribution of various chemicals on microplastics (MPs) has been widely studied, little was known about the concentrations of poly- and perfluoroalkyl substances (PFASs) on MPs. In this study, MPs from eight rivers draining into Pearl River Estuary (PRE) region were collected and analyzed. Higher concentrations of PFASs on MPs (105-9.07 × 10 ng g) were found in the drain outlets receiving wastewater from most urbanized cities with large population densities. On the other hand, lower concentrations of PFASs on MPs (10.3-227.8 ng g) were found in the drain outlets receiving wastewater mostly from agricultural and forested areas. Specially, 8:2 disubstituted polyfluoroalkyl phosphates (8:2 diPAP) was detected with the highest frequency, in 92.5% of the samples. Furthermore, a positive Spearman correlation was found between 6:2 disubstituted polyfluoroalkyl phosphates (6:2 diPAP) and perfluorotetradecanoic acid (PFTeDA) (r = 0.621, p = 0.012), indicating they might share similar sources. PFASs on MPs were found to vary significantly with different seasons. Higher concentrations of PFASs on MPs were found in dry seasons, while lower concentrations were observed in wet seasons. The results of this study should be important for the understanding of PFAS occurrence and distribution on MPs and the partitioning mechanism of PFASs on MPs in estuary systems.
虽然已经广泛研究了各种化学物质在微塑料（MPs）上的存在和分布情况，但对于多氟和全氟烷基物质（PFASs）在 MPs 上的浓度知之甚少。本研究采集了珠江口流域的 8 条河流中的 MPs 并进行了分析。在接收来自人口密度大的城市化城市的废水的排水口处，MPs 上的 PFASs 浓度（105-9.07×10ng g）较高。另一方面，在接收主要来自农业和林业地区的废水的排水口处，MPs 上的 PFASs 浓度（10.3-227.8ng g）较低。特别地，在 92.5%的样品中检测到 8:2 二取代多氟烷基磷酸酯（8:2 diPAP）的出现频率最高。此外，6:2 二取代多氟烷基磷酸酯（6:2 diPAP）和全氟十四烷酸（PFTeDA）之间存在正 Spearman 相关性（r=0.621，p=0.012），表明它们可能具有相似的来源。MPs 上的 PFASs 随季节变化显著。在旱季，MPs 上的 PFASs 浓度较高，而在雨季，浓度较低。本研究的结果对于理解 MPs 上的 PFAS 存在和分布以及河口系统中 PFASs 在 MPs 上的分配机制非常重要。
