Some aspects of accumulation of organic substances of different fractions of bottom sediments on the "river–sea" barriers (Razdolnaya river – Amur Bay)
Investigated the accumulation of organic carbon (Corg.), fulvic acids (FA) and humic acids (HA) in the fraction of subcolloidal coastal, river and sea sediments on geochemical barrier at the Razdolnaya River – Amur Bay. The highest concentration of Corg. was found in sea and FA and HA in river bottom sediments. It is shown that the processes of FA and HA fl occulation occur in the initial period of mixing of river and sea waters; in marine sediments the transformation of humic substances occurs and as a consequence – an increase of HA share, as compared to FA. It has been put a certain value Сп., characterizing the organic matter of bottom sediments that has not been subjected to biochemical processing. The increase of the value of this quantity from the river to the sea bottom sediments has been shown, which is possible due to the change in biomass of dead river and marine plankton.