Development of an Underwater Mass-spectrometry System for in Situ chemical Analysis
Digital Object Identifier (DOI)
Progress in the design, construction and packaging of small portable mass spectrometers for operation on autonomous underwater vehicles (AUVs) is described. Our first deployable version consists of a membrane introduction interface coupled with a linear quadrupole mass filter for in situ detection and quantification of dissolved gases and volatile organic compounds. We present laboratory results which demonstrate that sub-parts-per-billion detection limits have been achieved for toluene. The mass-spectrometer system is compatible with AUV constraints and operates on 24 V dc, consuming of the order of 100 W of power. Technical challenges of performing underwater mass spectrometry are addressed, in particular sample introduction from the water column and the maintenance of a vacuum system. Initial operation will be in shallow water of 30 m depth or less. Alternative versions of interfaces and mass spectrometers are also discussed. We anticipate that providing the capability of performing in situ underwater mass-spectrometric analysis will have a significant impact in the areas of marine science and environmental monitoring.
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Citation / Publisher Attribution
Measurement Science and Technology, v. 10, issue 12, art. 1195
Scholar Commons Citation
Short, R. T.; Fries, D. P.; Toler, S. K.; Lembke, C. E.; and Byrne, R. H., "Development of an Underwater Mass-spectrometry System for in Situ chemical Analysis" (1999). Marine Science Faculty Publications. 1801.