The measurement of the volatile organic fraction of the TOC in seawater |
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| Authors: | MD MacKinnon |
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| Institution: | Department of Oceanography, Dalhousie University, Halifax, N.S. B3H 4J1 Canada |
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| Abstract: | A method based on a dynamic head-space extraction and high-temperature oxidation of the trapped organic matter is described for the determination of the volatile organic carbon (VOC) concentration in seawater. The VOC concentrations in various geographic regions have been measured and calculated as a fraction of the total organic carbon (VOC/TOC). The VOC concentrations ranged from 15–60 μg C/liter in most oceanic areas. This volatile component was found to be a small fraction (1.5–6%) of the TOC. The VOC concentrations are highest in coastal regions and in the surface zone while the VOC/TOC ratio is relatively constant with depth and location. The volatile organic components may be important to the cycling of organic matter in sea water and the dynamics of this role have been postulated. |
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