State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China.
State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
Sci Total Environ. 2017 Jan 1;575:1177-1182. doi: 10.1016/j.scitotenv.2016.09.193. Epub 2016 Sep 30.
Chlorinated paraffins (CPs) are easily adsorbed into sediments where they pose potential risks to the ecosystem and human health. Few studies have investigated short- and medium-chain CPs (SCCPs and MCCPs) in sediments. The aim of the present study was to comprehensively investigate contamination levels, spatial distributions, sources and risks posed by CPs in sediments from the middle reaches of the Yangtze River. The sediment samples were analyzed by two-dimensional gas chromatography coupled with time-of-flight mass spectrometry (GC×GC-TOFMS). The concentrations of SCCPs and MCCPs ranged from 4.19 to 41.6ng/g dry weight (dw) and not detected to 14.6ng/g dw, respectively. No significant correlation was found between the total organic carbon contents and CP concentrations (P>0.05). The spatial distributions showed that CP contamination levels in the sediments were related to local human activities. The dominant congener groups were CCl for SCCPs, and CCl for MCCPs. Correspondence analysis revealed that likely sources of SCCPs were the production and use of CP-42 and CP-52. Principal component analysis indicated that SCCPs and MCCPs in the sediments may come from different sources. Moreover, CPs with nine carbon atoms were quantitated for the first time in sediment samples, and the results indicated they should not be neglected in future analyses. Risk assessments indicated that CPs in the sediments did not pose a great ecological risk currently.
短链氯化石蜡（SCCPs）和中链氯化石蜡（MCCPs）在沉积物中易于被吸附，对生态系统和人类健康构成潜在风险。目前，很少有研究调查沉积物中的短链和中链氯化石蜡（SCCPs 和 MCCPs）。本研究旨在全面调查长江中游沉积物中氯化石蜡的污染水平、空间分布、来源和风险。通过二维气相色谱-飞行时间质谱联用（GC×GC-TOFMS）对沉积物样品进行分析。SCCPs 和 MCCPs 的浓度范围分别为 4.19-41.6ng/g 干重（dw）和未检出至 14.6ng/g dw。总有机碳含量与 CP 浓度之间无显著相关性（P>0.05）。空间分布表明，沉积物中 CP 的污染水平与当地人类活动有关。优势同系物组分别为 SCCPs 的 CCl 和 MCCPs 的 CCl。对应分析表明，SCCPs 的可能来源是 CP-42 和 CP-52 的生产和使用。主成分分析表明，沉积物中的 SCCPs 和 MCCPs 可能来自不同的来源。此外，首次在沉积物样品中定量了含有九个碳原子的 CPs，结果表明，在未来的分析中不应忽视它们。风险评估表明，目前沉积物中的 CPs 不会对生态系统构成重大风险。
