Solid Phases of Zn in Some Contaminated Soils in Sohag, Egypt.

: Almost all human activities have contaminated or polluted vast soil tracts. Measuring the total metal concentration needs to provide more information on the bioavailability or toxicity of metals. Therefore, it has been established that the free metal ion concentration (or activity) is crucial in determining metal bioavailability and toxicity in most circumstances. The present study aimed to:1-evaluate the effects of prolonged use of three types of irrigated water (sewage effluent, industrial effluent-and Nile-water) on some soil properties, 2-determine the active portion of Zn 2+ , and 3-identify the possible solid phases (minerals), which govern the solubility of Zn2+ in some soil in Sohag Governorate, using stability mineral diagrams. The results revealed that clay content increased by 3.38 %, 9.2 %, and 14.64%) in industrial -, sewage -, and Nile-irrigated soil, respectively, over their corresponding values in the last layer of their profiles. Organic matter increased by 10 %, 30.9 %, and 8.69 % in industrial, sewage-and Nile-irrigated soil,