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The goal of our proposal was to develop new sampling and analytical techniques which could be used to understand the transformation rates and mechanisms of exchange between dissolved, colloidal, small particle and large particle size classes of organic carbon in ocean margins. To meet this goal, we focused on the development of cross-flow filtration (CFF) for the isolation of colloidal material from the dissolved phase in seawater. In addition, we tested and optimized high sensitivity techniques for the measurement of thorium isotopes using thermal ionization mass spectrometry (TIMS) and carbon isotopes using accelerator mass spectrometry (AMS) and stable C mass spectrometric techniques. Many of these techniques were pioneered by the PI`s assembled for original DOE study. In this final report, we highlight some of these new sampling and analytical developments as well as preliminary results from our first DOE cruise this past April. The report is broken down into 4 sections, namely (1) colloidal sampling strategies, (2) TIMS analytical developments, (3) carbon isotopic measurements and (4) results from the R/V Columbus Iselin cruise. For more detailed discussion of our findings, we have included as an appendix to final report manuscripts which have been published or will be submitted during this funding cycle

Transformation rates and fate of dissolved, colloidal and particulate forms of organic carbon in ocean margins. Final report, May 1, 1992--April 30, 1995