Development & Application of Proposal of Shipboard and In-Situ Chemical Sensors for Oceanographic Research

9521618绿色 开发了一种由渗透泵驱动的连续流动分析仪，用于监测淹没在淡水或海水中的硝酸盐浓度。由NaCl梯度驱动的渗透泵推动样品和试剂通过微型连续流动歧管。 该分析仪以每月约8.0和0.7 ml的样品和试剂流速运行，显示出从0到20微摩尔硝酸盐的线性响应，检测限为0.1微摩尔，并且具有约30分钟的90%响应时间。 分析仪通过定期校正基线和灵敏度漂移来自动校准自身， 进样和分析已知的标准溶液。 该系统已在淡水和海水中连续运行了一个月之久，并可适用于各种比色分析。 这里支持的研究将采用这种已证明的技术，并开发化学方法来分析各种痕量金属（即，铁、锌、镉、铜和锰），以及其它大量营养素（即，二氧化硅和磷酸盐）。这种分析仪的潜在应用包括海洋学研究以及环境监测和工业过程控制。

9521618 GREEN A continuous flow analyzer powered by osmotic pumps has been developed to monitor nitrate concentrations while submerged in freshwater or seawater. Osmotic pumps driven by a NaCl gradient propel both sample and reagents through a miniature continuous flow manifold. The analyzer operates with sample and reagent flow rates of about 8.0 and 0.7 ml per month, respectively, shows a linear response from 0 to 20 micromolar nitrate with a detection limit of 0.1 micromoles, and has a 90% response time of approximately 30 minutes. The analyzer automatically standardizes itself by correcting for baseline and sensitivity drift by periodically injecting and analyzing known standard solutions. The system has operated continuously for month-long periods in freshwater and seawater, and can be adapted to a variety of colorimetric analyses. The research supported here will take this demonstrated technology and develop the chemistries to analyze for a variety of trace metals (i.e., iron, zinc, cadmium, copper and manganese), as well as other macro-nutrients (i.e., silica and phosphate). Potential applications for such analyzers include oceanographic studies as well as environmental monitoring and industrial process control.