CHEMICAL FRACTION ANALYSIS AND ASSESSMENT OF MANGANESE IN TAILING AND ARGRICUTURAL SOILS SAMPLED IN THE LEAD AND ZINC MINE AREA AT HICH VILLAGE, DONG HY DISTRICT, THAI NGUYEN PROVINCE

Abstract

The chemical speciation of Manganese in tailing and agricultural soils in the mining area is crucial to access the contaminated levels of Manganese in soil samples collected in the mining zone. In the present study, the concentration of Manganese in soil samples was analyzed by using Inductively coupled plasma mass spectroscopy method. This study aslo applied the Tessier extraction procedure to determine chemical speciation of Manganese (Mn) in soil samples in lead/zinc mining area at Hich village, in Dong Hy district, Thai Nguyen province. The results showed that Mn existed primarily in residue fraction (F5) and least in the fraction of organic bonds (F4) in tailing samples.  Whereas, in the agricultural soils, Manganese exists predominantly in the phases of Fe-Mn oxi-hydroxide (F3), carbonate (F2) and least in the phase of organic bonds (F4). According to geo-accumulation index values, tailing samples are severely contaminated with Mn, while the agricultural soil samples have no contamination of Mn. According to RAC values, tailing samples have a moderate contamination of Mn, whereas the agricultural soil samples are at high and extremely high risk of Mn contamination.