Doctoral Dissertation Enhancement Project: Deciphering Arsenic Migration Pathways within the Mekong Delta, Cambodia

博士论文强化项目：破译柬埔寨湄公河三角洲内的砷迁移路径

• 批准号: 0751701
• 负责人: Scott Fendorf
• 金额: $ 0.79万
• 依托单位: Stanford University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-04-01 至 2009-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0751701&HistoricalAwards=false
• 关键词: Doctoral; Dissertation; Enhancement; Project; Deciphering

0751701FendorfThis award supports a doctoral dissertation enhancement project between Dr. Scott Fendorf, his student and Dr. Michael Sampson, Director, Resource Development International in Phnom Penh, Cambodia. The project will involve deciphering Arsenic migration pathways within the Mekong Delta in Cambodia. Arsenic, a toxic and carcinogenic metalloid found throughout the earth's crust, is adversely affecting millions of individuals worldwide. Many individuals in Southeast Asia are exposed to drinking water contaminated with arsenic. Despite the widespread poisoning and resulting attention on subsurface arsenic sources, biophysicochemical processes leading to Arsenic groundwater remain unresolved. The researchers propose to define the processes responsible for releasing Arsenic into the aqueous phase within the sedimentary basins of Southeast Asia. The Mekong Delta of Cambodia will serve as a model system for the study. In accomplishing this project they will utilize a suite of field measurements, intact core leaching experiments, and sediment incubations with native microbial communities. Once completed, they will provide a specific illustration of arsenic release and transport within sediments, which will constrain predictions of where Arsenic is a problem contaminant. Such predictions are desperately needed to combat the current health crisis associated with the widespread ingestion of arsenic contaminated waters, especially in the developing nations of Southeast Asia. The results of this study will provide a mechanistic description of Arsenic release from near-surface tropical sediments, inclusive of relevant biological, chemical, and hydrologic processes. The biochemical conditions with sediments conductive to Arsenic release will be constrained, and this disseminated information will be used to better predict locations which may be at higher risk of elevated Arsenic concentrations within Southeast Asia. The project will train the U.S. graduate student, as well as some young Cambodian scientists, to acquire and analyze field data, adding to the intellectual base now depleted by many years of the civil war. The project will also provide the U.S. graduate student with a global research experience. It is anticipated that the student will maintain scientific connections with his Cambodian collaborators for many years after the project is completed.

0751701fendorfthis Award支持他的学生Scott Fendorf博士和柬埔寨金边资源开发国际资源开发董事迈克尔·桑普森（Michael Sampson）博士学位论文增强项目。 该项目将涉及柬埔寨湄公河三角洲内的解密砷迁移途径。 砷是在整个地壳中发现的一种有毒和致癌金属，对全球数百万个人产生了不利影响。 东南亚的许多人暴露于被砷污染的饮用水。 尽管中毒普遍存在，并引起了地下砷源的关注，但导致砷地下水的生物化学过程仍未解决。 研究人员建议定义负责将砷释放到东南亚沉积盆地的水相中的过程。 柬埔寨的湄公河三角洲将作为研究的模型系统。 在完成该项目时，他们将利用一套现场测量，完整的核心浸出实验以及与本地微生物群落孵化的沉积物。 完成后，它们将提供有关沉积物内砷释放和运输的特定说明，这将限制对砷在哪里污染物的预测。 迫切需要进行此类预测，以应对与砷污染的水域广泛摄入相关的当前健康危机，尤其是在东南亚的发展中国家。这项研究的结果将提供从近地表热带沉积物中释放砷的机械描述，包括相关的生物学，化学和水文过程。 将限制具有沉积物导电到砷释放的沉积物的生化条件，并且该传播信息将用于更好地预测东南亚砷浓度升高的风险较高的位置。 该项目将培训美国研究生以及一些年轻的柬埔寨科学家，以获取和分析现场数据，从而增加了内战多年来已经耗尽的知识基础。 该项目还将为美国研究生提供全球研究经验。 预计在项目完成后，学生将与柬埔寨合作者保持科学联系。