Chemical processes at the sediment-water interface.

摘要: Abstract In natural waters, the sediment-water interface is site where gradients in physical, chemical and biological properties are greatest. Both microbiological transformation processes responsible for cycling elements between water sediments. This paper discusses various transformations that take place during early diagenesis sediments, which fueled by supply rates of organic carbon electron acceptors. particular, our current knowledge acceptors O, N, Mn, Fe S assessed, important role transport reactions described. The elemental fluxes across can be described from first principles only if coupling better understood. Large potentials many species this often lead to steep proton activities. redox sequence commonly observed time space also leads changes partitioning solutes carrier solution phases. Such cause rapid back-diffusion released overlying column or their removal onto secondary phases within Physical systems such as resuspension bioturbation particles control physical boundary conditions immediately above below interface. Because complex different chemical, processes, region must considered an integral part a three-dimensional network interactions. Hence, apparent coexistence ‘incompatible’ thermodynamic models consequence nature gradients. microbiological, interactions dissolved, colloidal particulate carbon, iron manganese oxides play crucial diagenetic at Their effects on reactions, trace adsorbed particles, discussed. Furthermore, we emphasize way hydrodynamics environments with high rain rates.