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Environ Sci Technol

Title:		Characterizing spatial and temporal variability of dissolved gases in aquatic environments with in situ mass spectrometry
Author(s):		Camilli R; Duryea AN;
Address:		"Woods Hole Oceanographic Institution MS#7, Woods Hole, Massachusetts 02543, USA. rcamilli@whoi.edu"
Journal Title:		Environ Sci Technol
Year:		2009
Volume:		43
Issue:		13
Page Number:		5014 - 5021
DOI:		10.1021/es803717d
ISSN/ISBN:		0013-936X (Print) 0013-936X (Linking)
Abstract:		"The TETHYS mass spectrometer is intended for long-term in situ observation of dissolved gases and volatile organic compounds in aquatic environments. Its design maintains excellent low mass range sensitivity and stability during long-term operations, enabling characterization of low-frequency variability in many trace dissolved gases. Results are presented from laboratory trials and a 300-h in situ trial in a shallow marine embayment in Massachusetts, U.S.A. This time series consists of over 15000 sample measurements and represents the longest continuous record made by an in situ mass spectrometer in an aquatic environment. These measurements possess sufficient sampling density and duration to apply frequency analysis techniques for study of temporal variability in dissolved gases. Results reveal correlations with specific environmental periodicities. Numerical methods are presented for converting mass spectrometer ion peak ratios to absolute-scale dissolved gas concentrations across wide temperature regimes irrespective of ambient pressure, during vertical water column profiles in a hypoxic deep marine basin off the coast of California, U.S.A. Dissolved oxygen concentration values obtained with the TETHYS instrument indicate close correlation with polarographic oxygen sensor data across the entire depth range. These methods and technology enable observation of aquatic environmental chemical distributions and dynamics at appropriate scales of resolution"
Keywords:		Carbon Dioxide/chemistry Environmental Monitoring/instrumentation/*methods Equipment Design Gases Hypoxia Mass Spectrometry/instrumentation/*methods Oscillometry/methods Oxygen/chemistry Pressure Time Factors Volatilization Water Pollutants/*analysis Wate;
Notes:		"MedlineCamilli, Richard Duryea, Anthony N eng Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. 2009/08/14 Environ Sci Technol. 2009 Jul 1; 43(13):5014-21. doi: 10.1021/es803717d"