In deltaic systems a transport of sand and fine-grained material occurs from the rivers via the fresh-water tidal area to the nearby coast. Especially sediments with diameters less than 50 microns can move with the water over large distances. Much information has already been obtained about the transport of mud and its chemical behaviour for a number of deltas in western Europe and in some tropical regions using manganese as an accompanying element (1-3). Afterwards the change in concentration of the trace elements Fe, Cu and Co during the movement of the sediments from the rivers to the adjacent coastal areas was also investigated (4). The trace elements were determined in acid extracts by conventional chemical methods. Such methods are cumbersome and do not necessarily lead to true values. It was therefore interesting to carry out some checks by nondestructive activation analysis. Moreover, this technique has provided extra information about the trace elements Cr, As, La, Sc and Sm. The results of this work are presented.