ANALYSIS OF SOURCES OF HEAVY METAL ACCUMULATION IN SOIL OF ORANGE GROWING AREA IN TRA ON, VINH LONG

Abstract

Intensive cultivation of orange trees in Tra On district, Vinh Long province has the ability to accumulate heavy metals, which will be detrimental to the ecosystem. The source of heavy metal accumulation in soil can be from natural and artificial sources. The purpose of the study is to evaluate the level of heavy metal pollution in soil in orange growing areas in Tra On district, Vinh Long and determine the source of pollution of these metals in soil. In this study, the heavy metal content of orange growing soil in Tra On district, Vinh Long Province was collected and determined. Methods that have been used for assessment include comparison with soil quality standards (QCVN 03:2023/BTNMT), using assessment indices based on background approaches and identifying sources of metal pollution. based on correlation analysis, principal component analysis (PCA). The results showed that the investigated heavy metals (Cu, Zn, Pb, Cd, Cr, Mn, Ni and Co) of soil samples in the study area did not exceed standards; The enrichment index EF shows the source of pollution from human activities; Igeo geochemical index and potential ecological risk index showed that Cd is the higher risk heavy metal. Statistical analysis including correlation analysis and PCA analysis showed that heavy metal pollution in the study area comes mainly from the use of fertilizers and fungicides. The results of this study provide basic data for farmers and managers in controlling local agricultural practices.