| Abstract: | In underground deferrization processes there exists a dynamic cation exchange euquilibrium for Fe-II to the solid phase of the underground when an Fe-II containing ground water is delivered. Methods of investigation for the estimation of the initial oxygen demand and of the Fe-II content of the aquifer are tested and described in detail. At dynamic filtering tests and within the framework of technically simpler batch-tests the oxygen demand was higher than expected according to the stoichiometric Fe-II share. A relatively good agreement was obtained between the results of both procedures. Fe-II bound to solid matter is measured by a developed Fe-III difference method. Fe-II can be extracted and determined also directly with 1,10-phenanthroline. Moreover, the determination method of the distribution coefficient with its influencing factors is described. Finally, the results of regression relations are explained. |
