DETERMINATION OF AVAILABLE FRACTION OF HEAVY METALS IN SOILBY USING DIFFERENT PROCEDURES FROM KURDISTAN REGION IRAQ.
The extractability of Mn, Ni, Cr and Co, was evaluated using H2O CaCl2 BaCl2 and HNO3extractants in this research. The surface soils were used to assess plant available metals with different extraction methods. The amounts of metal extracted by extraction solution were differences except the CaCl2 and BaCl2 were similar in metals extractability, all procedure were extracted highest concentration of Mn. While the strong extraction solution for metal extraction is HNO3 was extracted potentially available heavy metals in soil. The obtained results indicated a high variability of metal extraction depending on extraction procedure, and nature of the soil. The order of metal extraction by H2O is Mn>Ni>Cr>Co and the values are (5.52, 1.85, 1.79, 1.09 mg kg-1 soil) respectively, CaCl2 and BaCl2 extraction metals orderMn>Cr>Ni>Co, the values are (5.51, 2.69, 2.16 and 1.59 mg kg-1 soil) and (5.59, 2.52, 2.22 and 1.70 mg kg-1 soil) respectively, nevertheless the HNO3 metal extraction in order Mn>Ni>Co>Cr and values arre (213.02, 32.63, 14.80 and 13.92 mg kg-1 soil) respectively, While all procedure have highest affected on Mn extraction than the other metals and all different procedures extracted the available form of metals in soil.