检索结果-南通市图书馆

第八届全国同位素地质年代学和同位素地球化学学术讨论会

作者：何学贤朱祥坤杨淳唐索寒国土资源部同位素地质重点实验室北京中国地质科学院地质研究所

多接收器等离子体质谱是近年发展起来的高精度同位素分析手段之一,通过用等离子体质谱测量pb 国际标准物质NBS981和NBS982,显示出多接收器等离子体质谱分析pb 同位素的优势。利用Tl/Tl 进行作为内标,可以实现pb 同位素的质量分馏校正,... 详细信息

多接收器等离子体质谱是近年发展起来的高精度同位素分析手段之一,通过用等离子体质谱测量pb 国际标准物质NBS981和NBS982,显示出多接收器等离子体质谱分析pb 同位素的优势。利用Tl/Tl 进行作为内标,可以实现pb 同位素的质量分馏校正,极大地提高了pb 同位素分析的重现性。相比较热电离质谱,该方法精度更高,样品的用量更少,测试时间更短,多接收器等离子体质谱测定pb 同位素技术有良好的应用前景。

关键词：多接收器等离子体质谱 pb 同位素 NBS981 NBS982

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

A 150-year Isotopic Record of Lead Deposition in Yancheng Coastal Wetland,China

引用

Chinese Geographical Science 2016年第6期26卷 755-769页

作者： BAO Kunshan SHEN Ji QUAN Guixiang LIU Fugang State Key Laboratory of Lake Science and Environment Nanjing Institute of Geography and Limnology Chinese Academy of Sciences School of Environmental Science and Engineering Yancheng Institute of Technology School of Science Qiqihar University

Radioactive markers are useful in dating lead(pb) deposition patterns from industrialization in sedimentary archives. As a well-known natural reserve in the world, Yancheng coastal wetland in Jiangsu Province is one of areas most sensitive to global sea level change and is located in the most developed and polluted region of China. Two cores were collected in Yancheng wetland in October 2013 and dated using ^(210)pb and ^(137)Cs radiometric techniques. Sediments in both cores were sectioned into depth bands and examined systematically for dry bulk density, water content, magnetic susceptibility and grain-size. Multiple elements including pb were also measured using inductively coupled plasma systems. Unsupported ^(210)pb activities decreased with depth in both of the two cores, and ^(210)pb chronologies were established(covering 150 years) using the constant rate of supply(CRS) model. The measured pb contents ranged from 14.97 mg/kg to 29.40 mg/kg with average values of 17.17–22.79 mg/kg, and the pb fluxes ranged from 41.70 mg/(m^2·yr) to 172.70 mg/(m^2·yr) with averages of 95.59–123.41 mg/(m^2·yr). Temporal variations of pb flux, enrichment factors and pb isotopes show a gradual and continuous increase over time and clearly reflect increased emissions from anthropogenic activities in the region. The pb isotopic compositions show that most of pb deposition in Yancheng wetland is input from natural sources by water flows and has the same levels of pb as in the surface sediment of the Yangtze River and the Pacific mineral aerosol. We also stress the anthropogenic pb contribution in Yangcheng wetland sediment and the reason of our pb isotopes not showing anthropogenic signature is likely the instability of anthropogenic pb in high Fe/Mn oxide conditions. Therefore, more attention should be paid to current local pollution problems, and society should take action to seek a balance between economic development and environmental protection.

关键词：沿海的沼泽地 pb 免职率 pb 同位素 210 pb 标明日期金属污染

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：