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Equipment and Methods Oceanography CTD/Rosette (Seabird SBE 19 with 12 standard bottles, oxygen sensor and Fluo- rometer) Delphin (Standardversion with CTD, fluorometer, oxygen sensor) Thermosalinograph Secchi disc Nutrient concentrations PO«4-P after Murphy and Riley (1962) SiQO.-Si after Koroleff (1971) NO>-N after Bendschneider and Robinson (1952) NO3+NO>-N after Bendschneider and Robinson (1952) NH-;-N after Berthelot (1859) Nerg, extractabie €Xtraction with 2M KCI Nresiauar high temperature oxidation Pparticulate after Liebezeit, G. (1995). Particulate phosphorus fractions in a mangrove estuary. Senckenberg. Marit. 25: 123-126 TOC high temperature oxidation Oxygen Concentrations Oxygen after Winkler-Carpenter with dissolved Oxygen Analyser (DOA), photometric end point identification Organic Pollutants N. Theobald, W.Lange, A.Rave, U.Pohle und P.Koennecke, Dt. Hydrogr. Z., 43, 311 (1990): Ein 100-I Glaskugelschöpfer zur kontaminationsfreien Entnahme von See- wasser für die Analyse lipo-philer organischer Stoffe N.Theobald, W.Lange, W.Gählert und F.Renner, Fresenius J. Anal. Chem. (1995), 353, 50 - 56: "Mass spectometric investigations of water extracts of the river Elbe for the determination of potential inputs of pollutants into the North Sea" DQ