Homogeneous sedimentation

What experimental results are extant on the sedimentation of monodisperse random-coil polymers  

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Barfield, B.J., E.W. Tollner, and J.C. Hayes (1979). Filtration of sediment by simulated vegetation. I. Steady-state flow with homogeneous sediment. Trans. Am. Soc. Agric. Eng., 22(3) 540-548. 

In the case of PAG the total destruction of macromolecule structure is not observed and it is more labile since as we discussed earlier even at significant excess of AG monomer in PAG solution the system remained homogeneous (sediment was not formed) and at the decrease of GA monomer concentration in reaction solution (during its consumption in polymerization process) the polymerization solution gradually became transparent again and "micro-salting-out" of macromolecules was stopped. 

After sampling the sediment cores were frozen immediately and stored at -20°C before subdividing. As no substructures in the sediment material were indicated, the two cores were sliced into 2 cm layers and combined in one homogeneous sediment sample and freeze-dried under mild conditions (Ricking et al. 2003). 

Laborious, yet very reliable, is the complete extraction of the dried, mortared and homogenized sediment sample using appropriate acids. Usually a microwave pressure extraction in a closed system composed of PTFE or a similarly inert and resistant material is applied for this purpose nowadays. With this method, all the sedimentary constituents are dissolved without exception by applying various mixtures of HF, HCl and HNO (HCLO can be avoided in most cases) at temperatures between 250 and 260 °C and a pressure ranging from 30 to 50 bars. In the ultimately received, slight nitric solution - hydrofluoric acid is left to evaporate in the course of the procedure -practically all elements (including the rare earth elements) can then be analyzed markedly above their limit of detection by atom absorption spectrometry (AAS), optical plasma emission spectrometry (ICP-OES) and/or plasma mass spectrometry (ICP-MS). 

Within subsiding continental basins, groundwater can be induced by sediment compaction (pressure water) and by driving forces from topographic relief or from variations in fluid density. The intensive water flow can disturb the thermal profile and change the time-temperature history of buried source rocks. Maximal rate of pressure-water expulsion (Rpwe) can be estimated relatively easily using Eqs. 6.i and 6.2 for the case of one-dimensional consolidation of homogeneous sediments on immobile basement ... 

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