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Abstract
Selenium is an essential element for humans, animals and some species of microorganisms. Selenium has been detected in many forms. Its application could lead to soil, plant and water selenium pollution. The objectives of this study were; 1) to study selenium distribution 2) to assess soil characteristics which are most highly related to Se content in different soils locations of Egypt. 3) to determine the values of some parameters related to Se transport in soils i.e. retardation factor, Peclet numbers and hydrodynamic dispersion coefficient. For achieving these objectives, soil sampeles were collected from eighteen different locations (cultivated and uncultivated soils)of Egypt {(i.e., Matrouh, El-Arish, El-Tina Plain, El-Hesynia Plain, El-Mansoura, El-Gabal El-Asfer (irrigated with sewage effluent for 15, 100 years of cultivated soils), El-Fayoum (Qaruon lake, and Kom Oshim) and Toshki}.Soil samples were collected at three depths: 0-30, 30-60 and 60-90 cm, such that to represent most of the variation in Egyptian soils. Plant samples were collected from the same locations of soil samples in cultivated soils. Irrigation water samples were collected from cultivated areas. Also samples of sludger and sewage effluent were taken from Elgabal Asfer region.