Determination of organic matter, and C/N and C/S ratios in bottom sediments at Santos estuary, São Paulo State, Brazil".

Abstract

The Santos Estuary has been investigated in relation to antropogenic activities derived from the presence of an importante industrial and urban pole located around these areas. The objectives of this study were to evaluate the spacial distributions of organic carbon, total nitrogen and total sulphur to stablish the C/N and C/S ratios and to determine the content of organic matter related to its input to the sedimentary environment. The limits of organic carbon and nitrogen concentrations do not present an importante difference considering all points. An inversion in the concentration values of total sulphur was observed due to a possible distinct diagenetic process. The data showed higher values of organic matter in the low energy environments and relatively smaller values in the sectors where the hydrodynamic processes are intensive. It is possible to conclude that the sediments studied receive organic matter contributions from both continental and marine sources.