MARINE CHEMISTRY 41, 173-178

Fluorescence contouring analysis of DOC Intercalibration Experiment samples: a comparison of techniques

Paula G. Coble¹, Christopher A. Schulz² and Kenneth Mopper²

¹Department of Oceanography, University of Washington, Seattle, WA 98195, USA

²Chemistry Department, Washington State University, Pullman, WA 99164-4630, USA

The technique of 3-D fluorescence contouring was applied to samples from the DOC (dissolved organic carbon) Intercalibration Experiment using two different instrument types: a SPEX Fluorolog 2 and a Hitachi F3010. A comparison of results from the two instruments is presented for humic-like and protein-like fluorescence signals. Distinct differences in the composition of fluorescent DOC were observed between surface and deep water which may affect results of DOC measurements obtained by different analytical techniques.