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

详细信息    查看全文

• 作者：Michael R. Callahan ; Eric A. Kaltenbacher ; and Robert H. Byrne
• 刊名：Environmental Science & Technology
• 出版年：2004
• 出版时间：January 15, 2004
• 年：2004
• 卷：38
• 期：2
• 页码：587 - 593
• 全文大小：722K
• 年卷期：v.38,no.2(January 15, 2004)
• ISSN：1520-5851

文摘

Application of a portable in-situ spectrophotometricanalysis system for the measurement of Cu in estuarineenvironments is described in this work. Our spectrophotometric elemental analysis system (SEAS) used for in-situobservations of Cu concentrations is capable of fullyautonomous or user-controlled operations. The opticalcells used in SEAS systems are flexible liquid core waveguides(LCWs) with optical path lengths as long as 5 m. The1-m waveguide used in the present study provided a 3.0nM detection limit and a 5.0% relative standard deviation fora 25 nM copper sample. Analysis times range between 1and 5 min, allowing for acquisition of data on scalesappropriate to the highly dynamic biogeochemical natureof copper in the coastal environment. Field deployments ofSEAS-Cu in Tampa Bay, FL, showed low Cu concentrationsnear the mouth of the estuary (3-4 nM), with elevatedconcentrations (~25 nM) in anthropogenically impactedregions of the bay (e.g., marinas and areas adjacentwastewater treatment plants). Transect data betweenTampa Bay and a deep water harborage exhibited copperconcentrations ranging between 5 and 50 nM.