Beijing Key Laboratory of Bio-inspired Energy Materials and Devices, School of Space and Environment, Beihang University, Beijing, 100191, China.
Beijing Key Laboratory of Bio-inspired Energy Materials and Devices, School of Space and Environment, Beihang University, Beijing, 100191, China.
Environ Pollut. 2021 Feb 1;270:116076. doi: 10.1016/j.envpol.2020.116076. Epub 2020 Nov 12.
The spatial distributions, possible sources of C-C chlorinated paraffins (CPs), and the ecological risks posed in mangrove sediment in Dongzhai Harbor (Hainan Island, China) were investigated. Comprehensive two-dimensional gas chromatography combined with electron capture negative ionization mass spectrometry was used to determine 50 C-C CP congener groups. The concentrations of C-CPs, short-chain CPs (SCCPs), and medium-chain CPs (MCCPs) in the mangrove sediment samples were 8.28-79.7, 89.2-931, and 58.8-834 ng g dry weight, respectively. The CPs concentrations in the mangrove sediment samples were moderate compared with those found in other regions worldwide. The spatial distributions and congener patterns of the CPs indicated that the CP concentrations were mainly controlled by local emissions and that wastewater discharged from livestock and shrimp breeding facilities and domestic sewage were the main sources of CPs in mangrove sediment in Dongzhai Harbor. CCl and CCl were the dominant SCCP and MCCP congener groups, respectively. The MCCP concentrations and total organic carbon contents significantly correlated (R = 0.607, P < 0.05). Hierarchical cluster analysis and principal component analysis indicated that the SCCP and MCCP congeners were from different commercial CP formulations and sources. Risk assessments suggested that SCCPs and MCCPs in mangrove sediment in Dongzhai Harbor do not currently pose marked risks to sediment-dwelling organisms.
本研究调查了海南岛东寨港红树林沉积物中 C-C 氯化石蜡（CPs）的空间分布、可能的来源以及对生态系统的风险。采用综合二维气相色谱-电子俘获负电离质谱联用技术，对 50 种 C-CP 同系物进行了测定。红树林沉积物样品中 C-CPs、短链 CPs（SCCPs）和中链 CPs（MCCPs）的浓度分别为 8.28-79.7、89.2-931 和 58.8-834ng/g 干重。与世界其他地区相比，该地区红树林沉积物中 CPs 的浓度处于中等水平。CPs 的空间分布和同系物模式表明，CPs 浓度主要受当地排放的控制，来自牲畜和虾养殖设施以及生活污水的废水是东寨港红树林沉积物中 CPs 的主要来源。CCl 和 CCl 分别是 SCCP 和 MCCP 的主要同系物组。MCCP 浓度与总有机碳含量呈显著正相关（R=0.607，P<0.05）。层次聚类分析和主成分分析表明，SCCP 和 MCCP 同系物来自不同的商用 CP 配方和来源。风险评估表明，东寨港红树林沉积物中的 SCCP 和 MCCP 目前对底栖生物没有明显的风险。
