Washing of zinc(II) from contaminated soil column

Article Abstract:

Zinc removal efficiencies derived from an analysis of natural soil dosed with zinc solids and flushed with deionized water and solutions should be considered liberal rather than conservative owing to the procedure for manufacturing the zinc-contaminated soil. This is because ZnSO4*7H2O is a highly unlikely soluble mineral, and consequently, the unusually high Zn removal is unlikely to be representative of site-contaminated soils. However, while the authors concede that the high solubility of ZnSO4 makes results likely nonconservative, the claim that the characteristics of natural contaminated soils can be truly matched remains lacking in support.

Composition, Soil disinfection

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Identification of contaminated soils by dielectric constant and electrical conductivity

Article Abstract:

Conclusions from previous studies regarding the use of dielectric constant and electrical conductivity to identify concentration of pollutants in soils are problematic. The main problem with the studies is that their measurements were made at frequencies that are too low to be able to link electrical properties to the effects of pollutants and ion concentration. A more effective method for determining pollutants using electrical measurements has been developed by researchers at the University of California in Davis, CA.

Analysis, Soil pollution, Contamination, Electrical conductivity

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Simple equations to express settling column data

Article Abstract:

Models are proposed to address the errors associated with the analysis of settling column data for flocculent settling suspensions. The models can be used to describe the expected form of the phenomena being studied. The graph should have positive slopes which increases with time to describe flocculent settling suspensions.

Models, Flocculation, Flocculation tests, Suspensions (Chemistry), Settling basins

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