Abstract
In addition to the cascade filtering method, a new method of continuous-flow gel filtration (CFMF gel filtration) without replacing the filter septum has been developed and tested. The results of narrow size fractions separation from water samples with a high content of colloids (cascade filtration and continuous filtration) and the study of their migration with microelements are presented. An experimental investigation of the joint migration of a large number of elements (up to 40-60) and organic matter in continental waters demonstrates the high prospects for the methods to establish stable geochemical associations of trace elements adsorbed on colloids.
Highlights
The analysis of cascade filtration with replacement of filter septums led us to create a new and effective method to study the dynamics of separation of size fractions without replacing filters, in which the pore clogging and the permanently formed sediment layer serves as the main separation membrane in “continuous filtration” mode
A key feature of dynamic approach developed here is the continuous filtration of the original colloidal solution, but by definition it is always in equilibrium with the truly dissolved forms of elements, which are only partially in the adsorbed state
Comparison of experimental results and capabilities of data treatment methods for continuous and cascade filtering suggests that it is preferable to conduct a detailed study of colloidal fractions in the case of continuous filtering, when the main patterns of retardation can be more correctly investigated with membranes, where the gel phase itself occurs with colloids of continuously decreasing diameter
Summary
The analysis of cascade filtration with replacement of filter septums led us to create a new and effective method to study the dynamics of separation of size fractions without replacing filters, in which the pore clogging and the permanently formed sediment layer serves as the main separation membrane in “continuous filtration” mode. Filtration through such a sediment layer as a separation membrane has a number of characteristic features and obvious advantages.
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