MOLECULAR SCALE MERCURY SPECIATION IN FISH TISSUES FROM LAHONTAN RESERVOIR NY

纽约拉洪坦水库鱼组织中的分子尺度汞形态

• 批准号: 7370693
• 负责人: YUJI ARAI
• 金额: $ 0.02万
• 依托单位: STANFORD UNIVERSITY
• 依托单位国家: 美国
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-03-01 至 2007-02-28
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/7370693
• 关键词: MOLECULAR; SCALE; MERCURY; SPECIATION; FISH

This subproject is one of many research subprojects utilizing the resources provided by a Center grant funded by NIH/NCRR. The subproject and investigator (PI) may have received primary funding from another NIH source, and thus could be represented in other CRISP entries. The institution listed is for the Center, which is not necessarily the institution for the investigator. In collaboration with upcoming monitoring efforts by the U.S. Environmental Protection Agency, we are interested in examining shifts in mercury speciation through lower-trophic levels (e.g., phytoplankton and zooplankton), which typically generate higher (sometimes by 3 to 4 orders of magnitude) bioaccumulation factors for mercury, to upper-trophic levels (e.g., large mouth bass). The upper trophic level game fish has been shown in other mercury-contaminated systems to generate mercury concentrations over an order of magnitude above the USEPA Water Quality Guideline for mercury (currently 0.3 ppm). Because the toxicity of mercury is dependent on its chemical speciation, understanding mercury associations on a molecular level is critical to the effective management of contaminant sources and loads as well as to the development of process-integrated water-quality models for mining-affected aquatic systems. This beam time will be used to assess the feasibility of Hg LIII-edge bulk-XAS measurements in large-mouth bass that has the highest levels of mercurty among different organisms at the study site.

该子项目是利用NIH/NCRR资助的中心赠款提供的资源的许多研究子项目之一。子项目和研究者（PI）可能从另一个NIH来源获得主要资金，因此可以在其他CRISP条目中表示。所列机构为中心机构，不一定为研究者机构。与美国环境保护署即将开展的监测工作合作，我们有兴趣通过低营养水平（例如，浮游植物和浮游动物），通常会产生更高（有时高达3 - 4个数量级）的汞生物累积因子，而高营养级（例如，大嘴鲈鱼）。在其他受汞污染的系统中，高营养级猎用鱼产生的汞浓度超过美国环保局关于汞的水质准则（目前为0.3 ppm）一个数量级。由于汞的毒性取决于其化学形态，因此在分子水平上了解汞的关联对于有效管理污染物来源和负荷以及开发受采矿影响的水生系统的过程综合水质模型至关重要。该光束时间将用于评估在研究现场不同生物体中汞含量最高的大嘴鲈鱼中进行汞LIII边缘批量XAS测量的可行性。