At some stations of the cruises from 1985 to 1990 pH values and oxygen were measured: the oxygen 
concentrations were between 95 and 100 % of the saturation values, independencl of the measuring 
depth; the pH values were between 8.0 and 8.1 . 
LITERATUR 
Grasshoff, K., 1983: Determination of nitrite. Methods of Seawater Analysis, ed. by K. Grasshoff, 
M. Ehrhardt, K. Kremling, S. 139-142. 
Kalle, K., 1937: Nährstoff-Untersuchungen als hydrographisches Hilfsmittel zur Unterscheidung 
von Wasserkörpern. Ann. Hydrogr. marit. Meteorol. 65, 1-18. 
Körner, D. und G. Weichart, 1991: Nährstoffe in der Deutschen Bucht, Konzentrationsvertei 
lung und Trends 1978-1990. Dt. hydrogr. Z. Erg.-H. A, Nr. 17 
Koroleff, F., 1983: Determination of ammonia. Methods of Seawater Analysis, ed. by K. Grasshoff, 
M. Ehrhardt, K. Kremling, S. 150-157. 
Koroleff, F., 1968: Determination of total phosphorus in natural waters by means of persulphate 
oxidation. International Council for the Exploration of the Sea. C. M. 1968/C:33. 
Mangelsdorf, P., 1972: Methodische Verbesserungen der Phosphat-Bestimmung im Meerwasser 
mit dem Auto-Analyzer insbesondere für den Bordbetrieb. Helgoländer wiss. Meeresunters. 23, 
376-382. 
Murphy, J., and J. P. Riley, 1962: A modified single solution method for the determination of 
phosphate in natural waters. Anal. Chim. Acta 27, 31-36. 
Technicon, 1972: Nitrate and nitrite in water and seawater. Industrial method No. 158-71W. 
Technicon, 1972: Silicates in water and seawater. Industrial method No. 186-72W. 
Weich art, G., 1986: Nutrients in the German Bight, a trend analysis. Dt. hydrogr. Z. 39, 197-206. 
Weichart, G., 1990: The quality of „old" oceanographic phosphate data. International Council 
for the Exploration of the Sea. C. M. 1990/C:7.