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Comparison of 238U, 210Po and 210Pb Speciation in Six Different Types of Soils

Al-Masri, M. S., Nashawati, A., Amin, Y., Al-Masri, W., Al-Howary, M. A.
Bulletin of environmental contamination and toxicology 2019 v.102 no.2 pp. 239-245
Aridisols, Entisols, Inceptisols, Mollisols, Vertisols, carbonates, clay, clay fraction, electrical conductivity, industry, iron, lead, oils, organic matter, pH, phosphates, polluted soils, polonium, radionuclides, sand, silica, silt, uranium
Speciation of ²³⁸U, ²¹⁰Po and ²¹⁰Pb in six different types of Syrian soil (Entisols, Inceptisol, Aridisol, Mollisols, Vertisols and Rock outcrops) was studied using a four-step sequential extraction procedure. The binding nature of ²³⁸U, ²¹⁰Po and ²¹⁰Pb was correlated with soil properties including soil particles, pH, EC, OM, sand, silt and clay. The results showed that the exchangeable and carbonate fractions of ²³⁸U did not exceed 10%. In addition, the ²³⁸U, ²¹⁰Po and ²¹⁰Pb fractions bonded to organic matter increased as the soil clay content decreased. The highest ²¹⁰Po fraction was found to be bonded to soil Fe/Al/Mn-oxides for Entisols soils (56%) and silica for Aridisol soils (53%). Soil clay content showed a linear correlation with ²¹⁰Po concentrations in soils ranging from 0.34 to 0.91. The results are considered useful in assessing the risks resulting from soils contaminated by naturally occurring radioactive material from the phosphate and oil industry.