In situ Soil Probe for Rapid Delineation of Dense Non Aqueous Phase Liquids

描述(由申请人提供)：项目摘要/摘要：在第一阶段SBIR项目中，达科塔技术公司(达科塔)将展示一种简单的固态卤素专用探测器可以被小型化、硬化，并结合到能够实时描绘地下稠密非水相液体(DNAPL)的冲击式可交付探头中。拟议的系统将基于能够检测组成DNAPL的卤化挥发性有机化合物(HVOCs)的卤素特定检测器。探测器产生的信号将被达科他州开发的微型电荷积分器捕获，该积分器也将完全适合直接推进式探头的范围。选定的探测器和电子器件将与GeoProbe(R)系统公司开发的膜接口探测器(MIP)配对。通过将检测器放在MIP的正后方，将消除继续限制MIP标准实施例的性能的问题，例如分析物到达检测器的时间延迟和过载问题。这种独特的组合将使连续测量DNAPL和相关的渗流区和饱和区的溶解相成为可能。概念验证将通过实验室研究来建立，这些研究旨在证明检测器对hVOCs的特异性、在广泛的浓度范围内的单调行为、对变化的地下条件的免疫力以及在现场条件下的检测器寿命。在选择了最好的探测器并在实验室中证明其性能后，将构建一个全功能的原型探测器，并在有限的现场试验中运行。现场试验将展示该系统通过冲击力驱动的直推平台记录DNAPL的能力，从而提供对DNAPL在地下分布的前所未有的了解。对DNAPL分布的详细了解是设计有效补救策略的主要关键。拟议的系统将为环境顾问、工程师和监管机构提供他们迫切需要的DNAPL分发信息，以完成他们修复DNAPL地点的困难但并非不可能的任务。这项研究的最终受益者将是依赖清洁、健康饮用水供应的公民。项目简介：几十年来，氯化溶剂已被用于许多应用，包括干洗和金属脱脂。这些溶剂是致癌的，密度比水大，可以向下进入地下，最终到达用于公共供水的地下水含水层。拟议的研究将产生一个实时探测器，可以更准确地绘制这些溶剂在地下的源项(NAPL)，这将允许更快和更有效的清理，从而将公众对这些化合物的暴露降至最低。

DESCRIPTION (provided by applicant): Project Summary/Abstract: During this Phase I SBIR project, Dakota Technologies, Inc. (Dakota) will demonstrate that a simple solid state halogen specific detector can be miniaturized, hardened, and incorporated into a percussion deliverable probe capable of delineating dense non-aqueous phased liquids (DNAPL) in the subsurface in real time. The proposed system will be based on a halogen specific detector capable of detecting the halogenated volatile organic compounds (hVOCs) from which DNAPL is composed. The signals generated by the detector will be captured by a miniaturized charge integrator, developed by Dakota, which will also fit entirely within the confines of the direct push probe. The selected detector and electronics will be mated with a Membrane Interface Probe (MIP) developed by Geoprobe(r) Systems. By placing the detector directly behind the MIP, issues that continue to limit the performance of the standard embodiment of the MIP such as time lag for analytes to reach the detector and overloading problems will be eliminated. This unique combination will make continuous measurements of DNAPL and associated dissolved phase in both the vadose and saturated zones possible for the first time. Proof of concept will be established through laboratory studies designed to demonstrate the detector's specificity to hVOCs, monotonic behavior over a wide concentration range, immunity to changing subsurface conditions, and detector longevity under field conditions. After selecting the best detector and proving its performance in the lab, a fully functional prototype probe will be constructed and operated in a limited field trial. The field trial will demonstrate the system's ability to log DNAPL via percussion driven direct push platforms, providing an unprecedented understanding of DNAPL distribution in the subsurface. Detailed knowledge of DNAPL distribution is the main key to designing effective remediation strategies. The proposed system will provide environmental consultants, engineers, and regulators with the DNAPL distribution information they so desperately need to accomplish their difficult, but not impossible, task of remediating DNAPL sites. The ultimate beneficiaries of the research will be the citizens who rely on a supply of clean, healthy drinking water. Project Narrative: For decades, chlorinated solvents have been used for many applications, including dry cleaning and metal degreasing. These solvents are carcinogenic and being denser than water, can travel down into the subsurface, ultimately reaching the groundwater aquifers used for much of the public's water supply. The proposed research will lead to a real time probe that can more accurately map the source term (NAPL) of these solvents in the subsurface, which will allow for faster and more effective cleanup, thereby minimizing the exposure of the public to these compounds.