Batch Studies for the Investigation of the Adsorption of Lead onto Bentonite and Soil of Owerri, Nigeria. (Published)
Variability in lead adsorption by soil and bentonite was analyzed and results indicated that adsorption of lead increased as volume of Pb2+ solution increased. At 25ml adsorption capacity of bentonite and soil were 2494.19mg/kg and 2372.89mg/kg respectively. Maximum adsorption was observed at 100ml of Pb2+ in both soil and bentonite which were 9031.75mg/kg and 9935.75mg/kg respectively. At all volumes of Pb2+ solution, a significant positive correlation at (p≤0.05 and p≤0.01) probability levels were observed between clay, pH, CEC and organic matter content and adsorption capacity in soil and bentonite. While sand and silt content correlated negatively. Clay, sand, pH, CEC and organic matter content, were indicated to be the vital properties controlling adsorption in soil and bentonite. Bentonite and soil adsorption data were analyzed with both freudlich and langmiur adsorption isotherm, freudlich isotherm showed a better fitting of the adsorption data in both soil and bentonite with correlation factor (R2>0.9).
The Geological Context of the Sand/Gravel Areas, Holderness Plain, Kingston upon Hull, England (Published)
The clay till are interspersed with layers and lenses of sand and gravels of varying extent. Both the predominance of clay tills and the changing depths and thickness of the sand/gravel were confirmed in the Holderness Till. The uniformity coefficients, the ratio of sand to silt, and the percentages of gravel, sand, silt, and clay were calculated for all the catchment samples. Firstly, to determine precisely the extent of the sand/gravel areas within the glacial till and secondly, to establish whether the sand/gravel and the clay areas of the catchment behaved in hydrologically distinctive ways. The results confirmed that the higher the ratios and uniformity coefficients are for the sand areas which contributes to the higher permeability and hydraulic conductivity and that the lower ratios and uniformity coefficients are associated with the areas of clay which contributes to the lower permeability and hydraulic conductivity. The effective size is an indicator commonly used in the application of particle-size distribution to hydrological and hydraulic study.