Redistribution of arsenic and other contaminants at sites in New Jersey and Maine

新泽西州和缅因州场地砷和其他污染物的重新分布

• 批准号: 6323988
• 负责人: H J SIMPSON
• 金额: $ 15.33万
• 依托单位: COLUMBIA UNIVERSITY HEALTH SCIENCES
• 依托单位国家: 美国
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-06-01 至 2005-03-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/6323988
• 关键词: United States; arsenic; environmental contamination; environmental toxicology; environmental transport; field study; hazardous substances; oxidation reduction reaction; soil sampling; waste disposal; water flow; water pollution; water sampling /testing

Arsenic behavior in the subsurface reflects redox conditions, interactions with particle surfaces, specific minerals phases present in the aquifer in the groundwater recharge dynamics. We propose field studies at two Superfund sites with As contamination, both of which will be under active groundwater treatment through the period of our investigation. The Vineland Chemical Company (ViChem) site in southern NJ, experienced dispersal of at least hundreds of tones of waste AS over five decades into surface oils, aquifer formations, groundwater surface waters, plus stream, lake, and estuary sediments far downstream from the original arsenical herbicide and fungicide production facilities. Our strategy will be to examin4e recharge dynamics of this altered flow regimen, primarily through analyzing samples from monitoring wells for tracers already present in the environment and to relate behavior of As and other redox sensitive species to those changes. As part of our investigation, we would analyze groundwater for 3H/3He, total [As], As speciation Fe, Mn, NO3, SO4, O2, PO4/3-, Si(oh)4, Ph, Eh and major element chemistry. Samples would be collected periodically, to examine critical controls on As solubility and dynamics of subsurface As transport. We will collect and analyze a series of sediment cores in Union Lake in order to reconstruct the history of As migration downstream, and to estimate the proportion of As sediment inventory mobilized upward towards the sediment surface. A similar set of groundwater measurements, directed at elucidating controls on As behavior, would be conducted at the Winthrop (ME) Landfill site. Sources of As to this strongly reducing plume are unresolved, but mobilization from surrounding natural soils appears to be a significant possibility, suggesting that similar As plumes could occur at many other landfills. Differing from the Vineland site, the hydrogeology at Winthrop is very complex due to large spatial variability of hydraulic conductivity. We propose to better constrain the groundwater flow regime by employing geophysical survey techniques (ground penetrating radar and resistivity) in addition to 3H/3He. We will study As mobilization processes by following the geochemical evolution along a flow path underneath the landfill and by tracing the compositions of a plume of re- injected water labeled with SF6. Our studies will contribute to a better understanding of the processes affecting As transport under different geochemical conditions ranging from oxidizing to highly reducing. They could potentially also contribute to an increase in efficiency of As remediation at a number of Superfund sites currently under investigation.

地下中的砷行为反映了氧化还原条件，与颗粒表面的相互作用，地下水补给动力学中的含水层中存在的特定矿物相。我们建议在两个超级基金地点进行现场研究，并在我们的研究期间进行污染，这两者都将在积极的地下水处理下进行。新泽西州南部的Vineland Chemical Company（Vichem）地点经历了至少数百种废物的散布，因为超过五十年的地表油，含水层地层，地下水地表水，溪流，湖泊，湖泊和河口，远离原始的武器雷克酰胺和杀菌剂生产设施。我们的策略将是对这种改变的流动方案的审查4E充电动力学，主要是通过分析从监测井中的样品中的样品中为环境中已经存在的示踪剂，并将AS和其他氧化还原敏感物种的行为与这些变化相关联。作为调查的一部分，我们将分析地下水的3H/3HE，总计[AS]，AS Speciation Fe，Mn，No3，No3，So4，O2，Po4/3-，Si（OH）4，PH，EH，EH和主要元素化学。将定期收集样品，以检查对地下作为传输的溶解度和动力学的关键控制。我们将收集和分析联合湖中的一系列沉积物核心，以重建下游迁移的历史，并估计AS沉积物库存的比例向上移动向沉积物表面动员。将在Winthrop（ME）垃圾填埋场进行类似的地下水测量值，旨在阐明控制AS行为。关于这种大量减少的羽流的来源尚未解决，但是周围天然土壤的动员似乎是一种很大的可能性，这表明在许多其他垃圾填埋场中可能发生类似的羽流。与Vineland站点不同，由于水力传导率的空间变异性很大，Winthrop的水文地质学非常复杂。我们建议除3H/3HE之外，还采用地球物理调查技术（地面穿透性雷达和电阻率）来更好地限制地下水流量。我们将通过沿着垃圾填埋场下方的流动路径进行地球化学进化，并追踪带有SF6标记的重新注入水的羽流组成，从而作为动员过程进行研究。我们的研究将有助于更好地理解影响在不同地球化学条件下从氧化到高度还原的过程中影响的过程。他们也可能有助于提高目前正在研究的许多超级基金站点的AS补救效率。