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In-Situ Measurements of Cu in an Estuarine Environment Using a Portable Spectrophotometric Analysis System

机译:使用便携式分光光度分析系统在河口环境中进行铜的现场测量

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摘要

Application of a portable in-situ Spectrophotometric analysis system for the measurement of Cu in estuarine environments is described in this work. Our Spectrophotometric elemental analysis system (SEAS) used for in-situ observations of Cu concentrations is capable of fully autonomous or user-controlled operations. The optical cells used in SEAS systems are flexible liquid core waveguides (LCWs) with optical path lengths as long as 5 m. The 1-m waveguide used in the present study provided a 3.0 nM detection limit and a 5.0% relative standard deviation for a 25 nM copper sample. Analysis times range between 1 and 5 min, allowing for acquisition of data on scales appropriate to the highly dynamic biogeochemical nature of copper in the coastal environment. Field deployments of SEAS-Cu in Tampa Bay, FL, showed low Cu concentrations near the mouth of the estuary (3-4 nM), with elevated concentrations (~25 nM) in anthropogenically impacted regions of the bay (e.g., marinas and areas adjacent wastewater treatment plants). Transect data between Tampa Bay and a deep water harborage exhibited copper concentrations ranging between 5 and 50 nM.
机译:这项工作描述了便携式原位分光光度分析系统在河口环境中测量铜的应用。我们用于现场观察铜浓度的分光光度元素分析系统(SEAS)能够完全自主或由用户控制。 SEAS系统中使用的光学单元是柔性液芯波导(LCW),其光路长度长达5 m。本研究中使用的1-m波导为25 nM铜样品提供了3.0 nM的检测极限和5.0%的相对标准偏差。分析时间在1到5分钟之间,可以获取适合沿海环境中铜的高度动态生物地球化学性质的规模数据。 SEAS-Cu在佛罗里达州坦帕湾的野外部署表明,河口附近的铜浓度较低(3-4 nM),在人为影响的海湾地区(例如,码头和地区),铜浓度较低(〜25 nM)邻近的废水处理厂)。坦帕湾和深水港之间的横断面数据显示铜浓度范围为5至50 nM。

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