Perchlorate Sensing Platform for In-Field Groundwater Monitoring

描述(由申请人提供)：需要新的和改进的技术来监测地下水中的高氯酸盐污染。TDA Research Inc.提出了一种新的便携式传感器平台，用于现场监测高氯酸盐阴离子ClO4-，为此， 建议的补救目标是水中含量低于十亿分之3.6(3.6 ppb)。高氯酸盐是一种有毒的阴离子，会干扰甲状腺对碘(甲状腺激素中的一种必要元素)的吸收。这种抑制减少了甲状腺激素的产生；因此，发育中的胎儿以及婴儿和儿童都需要避免接触高氯酸盐。高氯酸盐是高度水溶性的，稳定，很难用化学或仪器手段检测到。它可以被地下水长距离输送，导致广泛和持久的污染。饮用水水源和食物供应都会受到高氯酸盐的污染。因此，检测和量化高氯酸盐是安全和补救工作的优先事项。特别寻求现场便携式方法来量化和远程监测现场的高氯酸盐，以减少实验室分析的次数，降低成本，并便利实时浓度数据的自动获取和通信。监测如此低水平的高氯酸盐即使在实验室也很困难，尤其是在现场，需要坚固耐用的分析仪才能进行无人值守操作。在本项目中，我们将为高氯酸盐的分析定量提供一种改进的方法 通过将新的高氯酸盐专用化学传感器与先进的荧光光谱设备相结合，在水中实现了这一目标。在第一阶段，我们将合成一种新的化学传感器探测器，验证其灵敏度(ClO4-检测极限以百万分之几(Ppb)为单位，目标是高部分-万亿(Ppt)精度)和选择性(ClO4-在其他阴离子存在的情况下的特异性)，并通过现场便携式仪器展示其实用性。在第二阶段和以后的项目阶段，w将开发一种集成设备，用于现场实时远程定量水中的ClO4- 样本。该传感器平台将具有快速、便携和计算机控制的特点，可与其他类型的地下水探头进行接口，并与计算机网络数据通信兼容。在这项工作中创建的商业产品将支持高氯酸盐污染地点的水的识别、监测和清理。

DESCRIPTION (provided by applicant): New and improved technologies are needed for monitoring perchlorate contamination in groundwater. TDA Research Inc. proposes a new portable sensor platform for in-the-field monitoring of the perchlorate anion, ClO4-, for which the recommended remediation goal is less than 3.6 parts-per-billion (3.6 ppb) in water. Perchlorate is a toxic anion that interferes with the uptake of iodide (a necessary element in thyroid hormones) by the thyroid. This inhibition decreases the production of thyroid hormones; thus, exposure to perchlorate needs to be avoided by the developing fetus as well as by infants and children. Perchlorate is highly water soluble, stable, and difficult to detect by chemical or instrumental means. It can be transported by groundwater over long distances, leading to extensive and persistent contamination. Both drinking water sources and food supplies can be contaminated by perchlorate. Therefore, detecting and quantifying perchlorate is a priority for safety and for remediation efforts. On-site, portable methods for quantifying and remote monitoring of perchlorate in the field are particularly sought to reduce the number of laboratory analyses, reduce costs and facilitate the automated acquisition and communication of real-time concentration data. Monitoring such low levels of perchlorate is difficult even in the laboratory, and is especially hard in the field, where a rugged analyzer is needed for unattended operation. In this project we will provide an improved method for the analytical quantification of perchlorate in water by combining new perchlorate-specific chemosensors with advances in spectrofluorimetry equipment. In Phase I we will synthesize a new chemosensor probe, validate its sensitivity (the ClO4- detection limit in parts-per-billion (ppb), with a goal of high parts-pe-trillion (ppt) accuracy) and selectivity (specificity for ClO4- in the presence of other anions), ad demonstrate its utility with field-portable instrumentation. In Phase II and later project phases w will develop an integrated device for the real-time on-site remote quantification of ClO4- in water samples. The sensor platform will be rapid, portable and computer-controlled, for ready interface with other types of groundwater probes and compatible with computer network data communication. The commercial products created in this work will support the identification, monitoring and cleanup of water at sites contaminated with perchlorate.