Zinc Adsorption in Soil Fractions and Related to Minerals Composition in the Sediments of Tigris and Euphrates Rivers .
2012
To study the relationship among mineralogical composition of soil fractions and fraction size , on adsorption of zinc in some alluvial soils , two soil sites are chosen to represent sediments of Tigris and Euphrates rivers.Soils are fragmented to find clay (< 0.2)micron , coarse clay (0.2-2)micron , silt (2-50)and sand (50-2000)micron fractions are treated with four levels of zinc solution(ZnSo4.7H2o) , at rates of (0,20,40,60microgram.ml-1) . The results show an agreement between amount of adsorbed zinc and soil content of smectite and chlorite minerals. The highest adsorption is in fine clay and sand of Tigris sediments , which have high content of expansible 2:1 minerals . The results show a negative relationship between amount of adsorbed zinc and fraction size. The results show that Zinc adsorption increase with further addition of Zinc to the samples and the highest zinc adsorbed is in the fine clay in all treatments, while sand is the lowest.
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