Mối liên hệ giữa thành phần khoáng vật và sự tồn lưu dioxin trong môi trường đất tại sân bay quân sự Biên Hòa, tỉnh Đồng Nai

Abstract

Bien Hoa air base in Dong Nai Province is one of the hotspots for dioxin contamination in the soil
environment with high concentrations in Vietnam. Due to its high population density, Bien Hoa is considered one of the most polluted areas, with potential health risks, and should be given priority attention in addressing the pollution problem. The study was carried out at Bien Hoa air base to determine the relationship between mineral composition and dioxin retention in soil. Soil samples were collected from six plots of 100 m2 each in the southwest corner of the runway (Pacer Ivy area) and the southwest area (SW-3) of Bien Hoa air base. The analysis of dioxin content and particle composition in soil samples revealed a positive correlation between dioxin content and fine particle composition. Furthermore, XRD analysis shows that the fine-grained composition in these samples includes the main mineral groups such as kaolinite, quartz, smectite, and illite, with the clay mineral kaolinite being the dominant mineral. Dioxin binds to the surface of kaolinite as well as the positively charged edges of illite and smectite clay platelets. Therefore, the soil environment for dioxin retention at Bien Hoa air base is composed primarily of clay mineral groups (kaolinite, illite, smectite), specifically dioxins absorbed on the surface and edges of these clay minerals.