渤海中部沉积物铅来源的同位素示踪

刘明; 范德江; 郑世雯; 田元; 张爱滨

doi:10.3969/j.issn.0253-4193.2016.02.004

渤海中部沉积物铅来源的同位素示踪

doi: 10.3969/j.issn.0253-4193.2016.02.004

中国海洋大学海底科学与探测技术教育部重点实验室, 山东青岛 266100

基金项目: 国家自然科学基金(41376055);国家自然科学基金重点基金(41520966);国家海洋局公益性项目(201105003-06)。

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出版历程
- 收稿日期: 2015-10-16
- 修回日期: 2015-11-27

Tracking lead origins in the central Bohai Sea based on stable lead isotope composition

Key Laboratory of Submarine Geosciences and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, China

摘要

摘要: 本研究对渤海中部表层和柱状沉积物中Pb的含量和同位素进行了分析,研究了其时空分布规律,并探讨了其物质来源。结果表明,表层沉积物中Pb的含量为14.54×10^-6~59.42×10^-6,其含量在渤海湾近岸、黄河口附近、研究区的东北部较高,而在研究区的中部和渤海湾北部含量较低;Pb同位素²⁰⁷Pb/²⁰⁶Pb的值为0.8341~0.8489,²⁰⁸Pb/²⁰⁶Pb的值为2.0828~2.0980。岩心沉积物中Pb含量、同位素组成与表层沉积物相似,整体上较为稳定,但在1990s以来呈现增大的趋势。渤海中部沉积物中Pb以自然来源为主,黄河沉积物是其主要物质来源,但渤海湾北端则与滦河源物质或沿岸侵蚀相关;人类活动影响主要出现在1990s以后,与中国含Pb矿石的燃烧等工业活动相关,但影响微弱,仅在黄河口西北近岸海域、渤海湾等个别站位得到体现。
- 铅同位素 /
- 沉积物 /
- 来源 /
- 渤海中部 /
- 人类活动
Abstract: The Pb concentration and stable isotopes (²⁰⁴Pb, ²⁰⁶Pb, ²⁰⁷Pb, and ²⁰⁸Pb) in surface and core sediments from the central Bohai Sea have been determined to investigate their spatial/temporal distribution and sources in this area. Results showed that the contents of Pb in surface sediments varied from 14.54×10^-6 to 59.42×10^-6, which had higher level in the coastal Bohai Bay, nearby Huanghe River estuary and northeast of the study area. Pb isotope ratio of ²⁰⁷Pb/²⁰⁶Pb and ²⁰⁸Pb/²⁰⁶Pb varied from 0.834 1-0.848 9 and 2.082 8-2.098 0 in surface sediments, respectively. The core sediment records showed that Pb content and isotopic composition were similar to the surface sediments. However, the vertical values of Pb content and isotopic ratios were stable overall, but they presented an increasing trend since 1990s. Pb in the central Bohai Sea sediments were mainly origined from natural materials, and the Huanghe River substances was the dominated source, while the northern end of the Bohai Bay was affected by the Luanhe River or coastal erosion. The impact of human activities on the Pb deposition appeared since 1990s in the sedimentary records, which mainly referred to the combustion of Chinese leaded ores and other industrial activities. However, the impact was weak, only reflected on several sites in the northwest of Huanghe River mouth and Bohai Bay.
- lead isotope /
- sediment /
- source /
- central Bohai Sea /
- human activities

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