SBIR Phase I: Total Organic Carbon Analysis for On-Site Monitoring

* 96 - 60634弗里克 这个小型企业创新研究（SBIR）第一阶段项目将开发一种适合长期现场监测的总有机碳（TOC）分析仪。 该分析技术依赖于通过二氧化钛的光催化作用将溶解和悬浮的有机物定量氧化成二氧化碳。 所产生的二氧化碳与碳酸盐物质的快速平衡允许其通过电导率测量来检测。 在二氧化钛催化的光氧化之前，将使用额外的电导率测量来解释预先存在的导电无机碳物质和溶解的离子物质的存在。 感测策略将需要差分电导率测量。 这种分析方法的好处是不需要消耗品。 通过将流体处理和导电电极集成到硅晶片上，将分析仪的尺寸最小化。 这将使用一个微光刻创建的流动系统和二氧化钛反应室来完成。 流动系统的小尺寸和因此小的流体体积将大大降低功率要求，并允许整个装置包含在便携式单元中。 能够现场快速测定总有机碳的传感器有望得到商业应用。 这些用途将用于实时监测废物处理场、发电设施和化学加工厂的废水流。 ***

*** 96-60634 Vreeke This Small Business Innovation Research (SBIR) Phase I Project will develop a total organic carbon (TOC) analyzer suitable for long term, on-site monitoring. The analytical technique relies on the quantitative oxidation of dissolved and suspended organics to carbon dioxide by the photocatalytic action of titanium dioxide. The rapid equilibrium of the resulting carbon dioxide with carbonate species allows it to be detected by a conductivity measurement. The presence of preexisting, conducting inorganic carbon species and dissolved ionic species will be accounted for using an additional conductivity measurement before the titanium dioxide-catalyzed photooxidation. The sensing strategy will require a differential conductivity measurement. The benefit to this analytical approach is the absence of consumables. Size of the analyzer will be minimized by integrating the fluid handling and conductivity electrodes onto a silicon wafer. This will be accomplished using a microlithography-created flow system and titanium dioxide reaction chamber. The flow system's small dimensions and therefore small fluid volumes will drastically reduce the power requirements and allow the entire device to be contained in a portable unit. Commercial applications are expected for sensors that enable rapid on-site determination of total organic carbon. Such uses will be made in real-time monitoring in effluent streams from waste treatment sites, power generation facilities, and chemical processing plants. ***