Sampling and Sampling Techniques. Filtration and Storage. Determination of Salinity. Determination of Oxygen. Determination of Hydrogen Sulphide. Determination of Thiosulphate and Sulfur. Determination of pH. Determination of Alkalinity and Total Carbonate. Determination of pCO2. Determination of Nutrients. Determination of Major Constituents. Determination of Trace Elements. Determination of Natural Radioactive Tracers. In Situ Registration of pH and Oxygen. Determination of Dissolved Organic Carbon (DOC) by High Temperature Combustion. The Automatic Determination of Dissolved Organic Carbon (DOC) by Wet Chemical Oxidation. Determination of Particulate Organic Carbon and Nitrogen. Preparation of Lipophilic Organic Seawater Concentrates. Adsorption Chromatography of Organic Seawater Concentrates. Clean-up of Organic Seawater Concentrates by HPLC. Fluorimetric Determination of Dissolved Petroleum Residues. Determination of Selected Organochlorines in Seawater. Determination of Volatile Halocarbons in Seawater. Determination of Dimethlysulfide. Determination of Marine Humics. Determination of Amino Acids and Carbohydrates. HPLC Analysis of Photosynthetic Pigments.