ANALYZING CHEMICAL FRACTIONATION OF STRONTIUM (Sr) IN SOILS AT THE Pb/Zn MINING AREA IN HICH VILLAGE, THAI NGUYEN PROVINCE

Abstract

The analysis of content and chemical fractionations of metals in the soil is essential because it provides comprehensive data on the risk level of pollution in the soil environment. In this study, five tailing samples and six field soils in the Pb/Zn mine at the Hich village were collected to study the Sr’s content. The total content and chemical fractionations of Strontium were extracted using the Tessier sequential extraction procedure and analyzed by the ICP-MS method. Five extraction forms were obtained: exchange form (F1), carbonate form (F20, bound form Fe/Mn oxide (F3), bound form with organic matter (F4) and residual form (F5). The results showed that the total content of Sr in the tailing and field soils were 22.67 ± 9.11 mg/Kg and 7.89 ± 9.90 mg/Kg. Sr’s speciation content in tailing soil was in the order of: F5 > F3 > F2 > F4 > F1, while that of field soil was F1 > F5 ~ F2 > F3 > F4. Correlation of pH values, total organic carbon (OC) and exchangeable fraction of Sr (F1_Sr) was evaluated, and the results showed that F1_Sr and OC both had a strong negative correlation with pH and F1_Sr with OC had a strong positive correlation with each other.