检索结果-南通市图书馆

Mercury source zone identification using soil vapor sampling and analysis

Frontiers of Environmental Science & Engineering 2015年第4期9卷 596-604页

作者： David WATSON Carrie MILLER Brian LESTER kenneth lowe George SOUTHWORTH Mary Anna BOGLE Liyuan LIANG Eric PIERCE Environmental Sciences Division Oak Ridge National Laboratory PO Box 2008 MS 6038 Oak Ridge TN 37831 USA

Development and demonstration of reliable measurement techniques that can detect and help quantify the nature and extent of elemental mercury （Hg（0）） in the subsurface are needed to reduce uncertainties in the decision-making process and increase the effectiveness of remedial actions. We conducted field tests at the Y-12 National Security Complex in Oak Ridge, Tennessee, USA, to determine if sampling and analysis of Hg（0） vapors in the shallow subsurface （〈0.3 m depth） can be used to as an indicator of the location and extent of Hg（0） releases in the subsurface. We constructed a rigid polyvinyl chloride push probe assembly, which was driven into the ground. Soil gas samples were collected through a sealed inner tube of the assembly and were analyzed immediately in the field with a Lumex and/or Jerome Hg（0） analyzer. Time-series sampling showed that Hg vapor concentrations were fairly stable over time, suggesting that the vapor phase Hg（0） was not being depleted and that sampling results were not sensitive to the soil gas purge volume. Hg（0） vapor data collected at over 200 push probe locations at 3 different release sites correlated very well to areas of known Hg（0） contamination. Vertical profiling of Hg（0） vapor concentrations conducted at two locations provided information on the vertical distribution of Hg（0） contamination in the subsurface. We conclude from our studies that soil gas sampling and analysis can be conducted rapidly and inexpensively at large scales to help identify areas contaminated with Hg（0）.

关键词： push probe spill characterization mapping,gas

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Uranium sequestration in sediment at an iron-rich contaminated site at Oak Ridge, Tennessee *** followed by reoxidation

引用

Journal of Environmental Sciences 2019年第11期31卷 156-167页

作者： Peng-Song Li Wei-Min Wu Debra H.Phillips David B.Watson Shelly Kelly Bing Li Tonia Mehlhorn kenneth lowe Jennifer Earles Hu-Chun Tao Tong Zhang Craig S.Criddle Department of Civil and Environmental Engineering William & Cloy Codiga Resource Recovery Center Center for Sustainable Development & Global Competitiveness Stanford University Stanford CA 94305-4020 USA Key Laboratory for Heavy Metal Pollution Control and Reutilization School of Environment and Energy Peking University Shenzhen Graduate School Shenzhen 518055 China Institute of New Energy Technology Tsinghua University Beijing 100084 China School of Natural and Built Environment Queen's University Belfast Belfast BT9 5AG Northern Ireland UK Environmental Sciences Division Oak Ridge National Laboratory Oak Ridge P.O.Box 2008 TN 37831 USA EXAFS Analysis Bolingbrook IL 60440 USA Department of Civil Engineering The University of Hong Kong Hong Kong China

This study evaluated uranium sequestration performance in iron-rich (30 g/kg) sediment via bioreduction followed by *** tests (1383 days) at Oak Ridge,Tennessee demonstrated that uranium contents in sediments increased after bioreduced sediments were re-exposed to nitrate and oxygen in contaminated *** of contaminated sediments (1200 mg/kg U) with ethanol in microcosm reduced aqueous U from 0.37 to 0.023 mg/*** of the bioreduced sediment were reoxidized with O2,H2O2,and NaNO3,respectively,over 285 days,resulting in aqueous U of 0.024,1.58 and 14.4 mg/L at pH 6.30,6.63 and 7.62,*** source-and the three reoxidized sediments showed different desorption and adsorption behaviors of U,but all fit a Freundlich *** adsorption capacities increased sharply at pH 4.5 to 5.5,plateaued at pH 5.5 to 7.0,then decreased sharply as pH increased from 7.0 to *** O2-reoxidized sediment retained a lower desorption efficiency at pH over *** NO3--reoxidized sediment exhibited higher adsorption capacity at pH 5.5 to *** pH-dependent adsorption onto Fe(Ⅲ) oxides and formation of U coated particles and precipitates resulted in U sequestration,and bioreduction followed by reoxidation can enhance the U sequestration in sediment.

关键词： Sediments Uranium Sequestration Bioreduction Reoxidation

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

营养发展的生物标志物(BOND)——锌的综述

营养发展的生物标志物(BOND)——锌的综述

引用

作者： Janet C King kenneth H Brown Rosalind S Gibson Nancy F Krebs Nicola M lowe Jonathan H Siekmann Daniel J Raiten Childrens Hospital Oakland Research Institute University of California University of Otago University of Colorado School of Medicine University of Central Lancashire

锌可以作为结构,调控,催化离子参与人体内的多种代谢。为了维持代谢功能,需要一个较宽范围的锌摄入来控制细胞,组织,和全身的锌稳态,因而使得评价锌缺乏和过剩变得困难。BOND(营养发展生物标志物)工程的锌专家小组推荐了3种指标评价锌... 详细信息

锌可以作为结构,调控,催化离子参与人体内的多种代谢。为了维持代谢功能,需要一个较宽范围的锌摄入来控制细胞,组织,和全身的锌稳态,因而使得评价锌缺乏和过剩变得困难。BOND(营养发展生物标志物)工程的锌专家小组推荐了3种指标评价锌的状态:膳食锌摄入,血浆锌浓度(PZC),以及和儿童的年龄别身高。用膳食锌和植酸估计的潜在可吸收的膳食锌总量可以用来识别个体个群体锌缺乏的风险。血浆锌浓度在膳食锌摄入不足和补锌时会有相应的变化,同时它也会在全身锌稳态和临床性缺锌之间进行调节。血浆锌浓度可以用来识别个体和人群的锌缺乏风险,然而在评估锌的状态时仍有局限。食品中的添加锌对血浆锌浓度的影响比餐外补充影响要小。血浆锌由于受到膳食锌的影响,个体差异很大,并且受到近期饮食、时间、炎症、一些药物和激素的影响。没有足够的数据支持与膳食摄入锌变化水平相一致的发锌、尿锌、指甲锌和血锌可以作为评价锌状态的生物标志物。生长情况是唯一推荐的锌的潜在功能指标。因为药物摄入的锌的剂量不足以促进生长,如果补锌能促进生长则表示这是锌缺乏的前兆。由于锌依赖性酶和蛋白质的活性或量,以及氧化应激、炎症或DNA损伤的生物标志物的信息不足,这些功能性指标也不推荐在临床或者其他领域来评价锌的营养状况。

关键词：锌锌状况膳食锌血浆锌锌功能

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

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

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

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：