黄河口沉积物中正构烷烃：分布、来源及历史沉积记录。
n-Alkanes in sediments from the Yellow River Estuary, China: Occurrence, sources and historical sedimentary record.
机构信息
CAS Key Laboratory of Crust-Mantle Materials and the Environment, School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China; State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, The Chinese Academy of Sciences, Xi'an 710075, Shaanxi, China.
CAS Key Laboratory of Crust-Mantle Materials and the Environment, School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China; State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, The Chinese Academy of Sciences, Xi'an 710075, Shaanxi, China.
出版信息
Ecotoxicol Environ Saf. 2018 Apr 15;150:199-206. doi: 10.1016/j.ecoenv.2017.12.016. Epub 2018 Jan 4.
UNLABELLED
A total of 21 surface sediments from the Yellow River Estuary (YRE) and a sediment core from the abandoned Old Yellow River Estuary (OYRE) were analyzed for n-alkanes using gas chromatography-mass spectrometry (GC-MS). n-Alkanes in the range C-C and C-C were identified in the surface sediments and the core, respectively. The homologous series were mainly bimodal distribution pattern without odd/even predominance in the YRE and OYRE. The total n-alkanes concentrations in the surface sediments ranged from 0.356 to 0.572mg/kg, with a mean of 0.434mg/kg on dry wt.
BASIS
Evaluation of n-alkanes proxies indicated that the aliphatic hydrocarbons in the surface sediments were derived mainly from a petrogenic source with a relatively low contribution of submerged/floating macrophytes, terrestrial and emergent plants. The dated core covered the time period 1925-2012 and the mean sedimentation rate was ca. 0.5cm/yr. The total n-alkanes concentrations in the core ranged from 0.0394 to 0.941mg/kg, with a mean of 0.180mg/kg. The temporal evolution of n-alkanes reflected the historical input of aliphatic hydrocarbons and was consistent with local and regional anthropogenic activity. In general, the investigation on the sediment core revealed a trend of regional environmental change and the role of anthropogenic activity in environmental change.
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本研究采用气相色谱-质谱联用仪（GC-MS）对黄河口（YRE）的 21 个表层沉积物和废弃黄河口（OYRE）的一个沉积物芯进行了正构烷烃分析。在表层沉积物和岩芯中分别鉴定出 C-C 和 C-C 范围内的正构烷烃。同系物主要呈双峰分布模式，在 YRE 和 OYRE 中没有奇数/偶数优势。表层沉积物中正构烷烃总浓度范围为 0.356-0.572mg/kg，干重平均浓度为 0.434mg/kg。
基础
正构烷烃示踪剂的评价表明，表层沉积物中的脂肪族烃主要来源于生源源，淹没/漂浮的大型水生植物、陆地和挺水植物的贡献相对较低。该年代测定的岩芯涵盖了 1925-2012 年的时间段，平均沉积速率约为 0.5cm/yr。岩芯中总正构烷烃浓度范围为 0.0394-0.941mg/kg，平均浓度为 0.180mg/kg。正构烷烃的时间演化反映了脂肪族烃的历史输入，与当地和区域人为活动一致。总的来说，对沉积物芯的研究揭示了区域环境变化的趋势以及人为活动在环境变化中的作用。
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