Đánh giá mức độ tích lũy một số kim loại nặng trong trầm tích mặt tại một số cửa sông ven biển tỉnh Thái Bình
Abstract
With the characteristics of a country with a long coastline and diverse terrain, marine environment protection is increasingly focused on a sustainable development of marine economy. However, marine economic activities such as tourism, seaports, aquaculture, etc., are creating great pressure on the marine environment in Vietnam. Along the coastal Thai Binh province, there are many estuaries with various marine economic activities, significantly influencing the marine environment and ecosystem. Therefore, this study assessed the accumulation of some heavy metals (Pb, Cd, As, Cu, Zn) in surface sediments in the coastal area of Thai Binh. Marine sediment samples were collected in July 2024 (rainy season) to assess the content of some metals at three estuaries of the Thai Binh River, Diem Ho River, and Tra Ly River with different economic activities. The results showed that the concentrations of heavy metals ranged from 0.043 to 145.833 mg/kg, with the lowest concentration being Cd at the Thai Binh River site (TB4) and the highest being Zn at the Diem Ho estuary site (DH3). All concentrations were below the sediment quality limits specified in QCVN 43:2017/BTNMT. The average concentrations of heavy metals decreased in the order: Zn > Pb > Cu > As > Cd. The results of the Geo-accumulation Index (Igeo) indicated that the Diem Ho estuary had a higher level of heavy metal accumulation compared to the other two estuaries, particularly for Pb, Cd, and Cu.
