Abstract:
Selenium is an essential microelement, necessary for normal functioning of human , animals and
organisms. Eight extraction solutions were used to extract selenium forms (0.25M KCl, Soluble;
0.1M KH2PO4, ligand exchangeable; 1M NaOAC, Carbonate ; 4M HCl, crystalline oxides; 0.5M
NaOH, Alkaline soluble; 0.1M NH2OH- HCl, easily reducible oxides; 0.25M NH2OH-HCl +
0.25M HCl, amorphous oxides; 16M HNO3, total) from ten calcareous soils collected from
southern parts of Iraq. Total selenium concentration in studied soils was ranged between 35.0 mg
kg-1
for Zubair desert soil to 78.5 mg kg-1
for Adel marsh soil. Amount of selenium extracted
with 1M NaOAC( carbonate form was the greatest 25.87% of to totals), and that extracted with
0.25 M KCl (soluble from) was the smallest. Selenium forms concentrations significantly
correlated with soil properties (organic matter, CEC, CaCO3, clay, and sand). |
