p. 45 - 66 CARACTERISTIQUES CHIMIQUES DES EAUX DU DANUBE ET DES EAUX MARINES COTIERES DU SUD DU LITTORAL ROUMAIN PENDANT LA PERIODE 1980-1981 Lucia Popa et Adriana Cociasu et Iulia Voinescu Institut Roumain de Recherches Marines Constanta Abstract Based on daily-performed observations in the Danube and inshore marine waters during 1980-1981, the paper follows the seasonal and yearly variations of the main chemical agents. The influence of Danube waters on the distribution of salinity,oxygen, organic matter (as oxydability) and nutrients in marine water along the Romanian coast of the Black Sea is discussed.