Project 4: Geochemical Predictors of Arsenic Contamination

摘要：项目4 项目4旨在更好地了解导致iAs溶解和相关氧阴离子形成的因素 井水中微量元素（V、Cr）。一般认为，地球化学过程（岩石风化， 氧化还原转化）控制这些污染物从含水层物质中溶解。然而，详细 对地下过程的机械理解和应用地球化学参数的能力， 污染的预测是缺乏的，因此，饮用水威尔斯井可能容易受到 污染.核心假设是，特定岩石和地下水的浓度- 宿主化学氧化剂可用于预测饮用水中砷、钒和铬污染的风险- 水威尔斯，指导共同污染场地的补救战略，并促进健康干预。 这个话题在北卡罗来纳州尤为重要，那里也有20个超级基金站点记录为A 作为重要的人口利用饮用水威尔斯井与高砷，钒，铬从地质来源。我们 因此，提出了一个多管齐下的计划，将实地、实验室和光谱测量结合起来， 机械和地理空间建模，以（1）发展对对比的全面多尺度理解 氧化还原驱动的机制，砷，钒，铬增溶，和（2）衍生工具，用于预测当前和未来 井水污染。利用基础研究开发地球化学预测因子 污染与该中心的主题“确定减少iAs暴露的新方法， 阐明iAs诱导的代谢功能障碍的潜在机制，以预防疾病。 拟议的研究将通过指导未来的钻井和监测工作来促进疾病预防， 潜在地提高意识和减少接触天然存在的有毒微量元素。 此外，这项研究将激发新的干预措施，以应对环境中的污染物， 包括北卡罗来纳州的地质影响地点，以及地质影响地点， 作为超级基金网站。

ABSTRACT: PROJECT 4 Project 4 seeks to better understand the factors that result in solubilization of iAs and related oxyanion-forming trace elements (V, Cr) in well water. It is generally accepted that biogeochemical processes (rock weathering, redox transformations) control solubilization of these contaminants from aquifer materials. However, detailed mechanistic understanding of subsurface processes and an ability to apply biogeochemical parameters as predictors of contamination are lacking, and as a result, drinking-water wells may be susceptible to contamination. The central hypothesis is that the concentrations of specific rock- and groundwater- hosted chemical oxidants can be used to predict the risks of iAs, V, and Cr contamination in drinking- water wells, guide remediation strategies for co-contaminated sites, and facilitate health interventions. This topic is particularly relevant in North Carolina, which has 20 Superfund sites with documented As, as well as significant population utilizing drinking-water wells with elevated iAs, V, and Cr from geogenic sources. We thus propose a multipronged plan that integrates field, laboratory, and spectroscopic measurements with mechanistic and geospatial modeling to (1) develop a comprehensive multiscale understanding of the contrasting redox-driven mechanisms of iAs, V, and Cr solubilization, and (2) derive tools for predicting current and future contamination of well water. The use of fundamental research to develop geochemical predictors of contamination is aligned with the theme of the center “Identifying novel methods to reduce iAs exposure and elucidating mechanisms underlying iAs-induced metabolic dysfunction with a vision for disease prevention.” proposed research will facilitate disease prevention by guiding future well placement and monitoring efforts, potentially increasing awareness and decreasing exposure to naturally occurring toxic trace elements. Furthermore, this research will motivate novel interventions for responding to contaminants in the environment, including geogenically impacted sites in North Carolina, as well as in anthropogenically impacted locations such as Superfund sites.