Factors affecting chemical DTPA-extractabilily of some heavy metals from different soil types in Egypt [electronic resource].

Includes references.

The objectives of this study were to determine the amounts of total and available heavy metals in some Egyptian soils and their relation with some soil properties. Five soil profiles; two from Kafr EI-Sheikh Governorate located at south Kafr El-Sheikh city and south Baltim city to represent Delta soils and three profiles from El-Beheira Governorate located at Housh-Eisa, Abo El-Matameir and Mariut to represent Delta fringes soils. These profiles were chosen to cover as far as possible the Delta soils (Fluvial and Lacustrine soils) and Delta fringes soils (Sandy calcareous and Alluvial calcareous soils and Calcareous soils) at the northern part of Egypt. Data showed that, the surface layers of Delta soil contained higher amounts of total and available Cu, Ni, Cd and Pb than the subsurface soil layers and decreased with depth. The contents of total Cu, Ni, Cd and Pb in Delta soils varied from 246.3 to 102.5, 186.3 to 100.0,9.85 to 1.85 and 175.0 to 60.0 mg/kg soil, respectively in the surface layers. The corresponding values of the DTPA-extractable metals were 11.8 to 11.4, 0.78 to 0.8, 0.21 to 0.023 and 0.37 to 0.22 ppm, respectively. The average content of total Cu, Ni, Cd and Pb for Delta fringes soils varied from one metal to another and also from one soil to another. Therefore, these metals can be arranged according to t"iieir contents in the order: Cu > Pb > Ni >Cd. The contents of total Cu, Ni, Cd and Pb in Delta fringes soils varied from 57.5 to 120.0,62.5 to 95.0, 2.3 to 4.65 and 39.5 to ,69.5 mg/kg, respectively for the surface layers. The alluvial calcareous soils.

Summary in Arabic.

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