THE EXISTENCE AND MOBILITY OF DIOXIN IN SOIL, WEATHERING CRUST AND SEDIMENTS IN THE BÙ GIA MẬP AREA, BÌNH PHƯỚC PROVINCE

ĐOÀN THỊ NGỌC HUYỀN¹, PHẠM VĂN THANH²,
PHẠM THU HIỀN³, LÊ THỊ TUYẾT¹, QUÁCH ĐỨC TÍN^1.2

¹Institute of Geosciences and Mineral Resources, Thanh Xuân, Hà Nội.
²Việt Nam Association of Geochemists, Hà Nội.
³Department of Geology and Minerals of Việt Nam, 6 Phạm Ngũ Lão, Hà Nội.

Abstract: The soil, sediments and weathering crust in the Bù Gia Mập area, Bình Phước Province, have been demonstrated to be contaminated by many different organic compounds, including 2.3.7.8-tetrachlorodibenzo-p-dioxin (TCDD), polychlorinated dibenzo-p-dioxins (PCDDs), polychlorinated dibenzofurans (PCDFs) and some other congeners. This study identifies that the highest dioxin concentration concentrates in red-yellowish ferralite basaltic soil (Fu) (in average:26.5 ppt), especially, in the Bù Gia Mập Airport (43.2 to 236.3 ppt). It is higher than permitted limits for agriculture and forestry soil.

Moreover, this study also shows that dioxin can move from the Bù Gia Mập Airport to surrounding areas, as well as dioxin concentration gradually reduces in depth. The concentration of dioxin exceeding the permitted limits has been affecting greatly human health and ecological environment.