胶州湾表层海水中的正构烷烃及其来源解析

发布时间：2018-01-15 15:25

本文关键词：胶州湾表层海水中的正构烷烃及其来源解析　出处：《环境科学》2017年07期 　论文类型：期刊论文

【摘要】：正构烷烃是自然界中普遍存在的有机物质,其组成和分布与人类活动密切相关,是表征有机污染物来源的良好标志物.用气相色谱-质谱(gas chromatography-mass spectrometry,GC-MS)对2016年4月胶州湾表层海水中的正构烷烃进行检测,首次报道了胶州湾表层海水中正构烷烃的分布特征及来源解析.结果表明,其含量在1.756~39.09μg·L~(-1)之间,主要由连续分布的C11~C_(37)正构烷烃同系物组成,没有明显的奇偶优势,但碳数为C_(21)~C_(33)的正构烷烃约占总正构烷烃的95.0%.胶州湾表层海水中正构烷烃的高值区以湾口为主,在湾内东北部和西部也有出现,这一分布特征与胶州湾东北部和西部河流带来的工业废水、生活污水和湾口码头附近的船舶航运带来的正构烷烃输入有关.水交换较为充分的湾中部和湾外海域正构烷烃总量在1.756~2.842μg·L~(-1)之间,平均值为2.196μg·L~(-1),可视为胶州湾正构烷烃的环境背景值.其碳数分布有明显的C_(24)主碳峰,前峰群有微弱的奇碳优势,后峰群有微弱的偶碳优势,表明这部分正构烷烃以藻类和海洋细菌等生物自生输入为主.人类活动对胶州湾的影响很大,输入的正构烷烃主要集中在湾口及湾内近岸海域,由C_(21)~C_(33)正构烷烃同系物组成,呈现出有微弱偶碳优势的后峰群单峰形分布特征,代表高度风化的石油类污染物.其含量在9.606~39.09μg·L~(-1)之间,约占胶州湾总正构烷烃量的83.7%.整体来看,胶州湾表层海水对正构烷烃的去除机制以蒸发、稀释等物理风化过程为主,从湾内向湾外风化强度增大.
[Abstract]:Normal alkanes are common organic substances in nature. Their composition and distribution are closely related to human activities. It is a good marker to characterize the source of organic pollutants. Gas chromatography-mass spectrometry (chromatography-mass spectrometry) is used to characterize the source of organic pollutants. In April 2016, the normal alkanes in the surface water of Jiaozhou Bay were detected by GC-MS.The distribution and source analysis of normal alkanes in the surface water of Jiaozhou Bay were reported for the first time. Its content is in the range of 1.756 ~ 39.09 渭 g 路L ~ (-1), which is mainly composed of C _ (11) C _ (17) C _ (37)) homologues of n-alkanes, which have no obvious parity and even advantage. However, the normal alkanes with a carbon number of Che / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C. It is also found in the northeast and west of the bay, which is related to the industrial wastewater from the rivers in the northeast and west of Jiaozhou Bay. Domestic sewage is related to normal alkane input from shipping near the bay port. The total amount of normal alkanes in the middle of the bay and outside the bay is 1.756 ~ 2.842 渭 g 路L ~ (-1). Between-1). The average value is 2.196 渭 g 路L ~ (-1) 路L ~ (-1), which can be regarded as the environmental background value of n-alkanes in Jiaozhou Bay. The latter peak group has a weak even carbon advantage, which indicates that the n-alkanes are mainly derived from algae and marine bacteria, and human activities have a great influence on Jiaozhou Bay. The imported normal alkanes are mainly concentrated in the bay mouth and inshore waters, and are composed of C _ (J) 21 / C ~ (3)) n-alkanes homologues, showing a single peak distribution feature of the hind peak group with weak even carbon advantage. It represents highly weathered petroleum pollutants, the content of which is between 9.606 渭 g 路L ~ (-1) and 39.09 渭 g 路L ~ (-1), which accounts for 83.7% of the total n-alkanes in Jiaozhou Bay. The removal mechanism of n-alkanes in the surface water of Jiaozhou Bay is mainly physical weathering process such as evaporation and dilution.
【作者单位】：中国科学院海洋生态与环境科学重点实验室(中国科学院海洋研究所);中国科学院大学地球科学学院;青岛海洋科学与技术国家实验室海洋生态与环境科学功能实验室;
【基金】：国家自然科学基金项目(41376092) 青岛海洋国家实验室“鳌山人才”计划项目(2015ASTP-OS13)
【分类号】：X55
【正文快照】： 北京100049;3.青岛海洋科学与技术国家实验室海洋生态与环境科学功能实验室,青岛266237)正构烷烃是一类直链饱和碳氢化合物,在自然界中普遍存在[1],它们的组成和分布与人类活动密切相关.进入水环境的正构烷烃不但对水生生物有明显的毒害作用,而且会随着地球化学循环过程危及人

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