During cruise #49 of the R/V Atlantis II to the Black Sea in March and April of 1969, samples of suspended matter were collected by filtration of 8 to 101. water samples through 0·45 μ membrane filters. The distribution of the total suspended matter at this time was dominated by detrital silicate particles from the major rivers of Russia, Romania and Bulgaria but a significant influence from the Sea of Azov was detectable. The concentrations of Mn, Fe, Co, Hg, Sc, Zn, La and Sb in the suspended matter have been determined by instrumental neutron activation analysis. From these data it is apparent that the distribution of these elements in vertical profiles is influenced by four processes: (1) The presence of detrital silicates.(2) Precipitation as sulphides in the deep water. (3) Coprecipitation with or adsorption by MnO 2 that is precipitated just above the oxygen zero boundary. This is due to the upward flux of dissolved Mn(II) by advection and diffusion. (4) Concentration by marine organisms in the surface waters. The profiles of scandium, lanthanum and iron are dominated by process (1) but processes (2), (3) and (4) also can be shown to be significant for iron. The manganese profile is dominated by process (3) and the zinc profile by process (2) while the profiles of cabalt, antimony and mercury are influenced by processes (1), (2) and (3).