Guideline references to levels of heavy metals in arable soils in upper Egypt

Four soil profiles were selected from four different locations in upper Egypt including Tushka, Wadi El-Nuqra, El-Kharga, and El-Dakhla to evaluate the total and dithionate-citrate-bicarbonate (DCB) extractable heavy metals (Fe, Mn, Zn, Cu, Pb, Cr and Ni) levels in these soils. The heavy metal distributions in bulk soil samples and their size fractions (clay, silt and very fine sand) were also investigated. The studied soils had a coarse texture...