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

0 Người đánh giá. Xếp hạng trung bình 0

Tác giả: Thị Hiền Đỗ, Bảo Linh Lê, Thị Thắm Trịnh, Thị Thủy Trịnh

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Tạp chí Môi trường - Chuyên đề Khoa học - Công nghệ, 2024

Mô tả vật lý: tr.27-36

Bộ sưu tập: Metadata

ID: 485791

Thêm vào giỏ

Các hoạt động kinh tế biển như du lịch, cảng biển, nuôi trồng thủy hải sản… đang tạo ra những sức ép lớn đến môi trường biển tại Việt Nam. Thái Bình là một tỉnh có đường bờ biển dài với nhiều cửa sông, có các hoạt động kinh tế biển khá đa dạng tạo nên sức ép không nhỏ đến môi trường và hệ sinh thái biển. Nghiên cứu áp dụng các phương pháp: Khảo sát thực địa và lấy mẫu
phân tích trong phòng thí nghiệm
xử lý số liệu để đánh giá mức độ tích lũy một số kim loại nặng (Pb, Cd, As, Cu, Zn) trong trầm tích mặt tại vùng ven biển Thái Bình. Các mẫu trầm tích biển được lấy vào tháng 7 năm 2024 (mùa mưa) để đánh giá hàm lượng một số kim loại trong trầm tích tại ba cửa sông: Thái Bình, Diêm Hộ và Trà Lý với các đặc thù hoạt động kinh tế có sự khác nhau. Kết quả nghiên cứu cho thấy, hàm lượng các kim loại dao động trong khoảng 0,043 - 145,833 mg/kg tương ứng với giá trị nhỏ nhất là hàm lượng Cd tại vị trí sông Thái Bình (TB4), giá trị lớn nhất là hàm lượng Zn tại cửa sông Diêm Hộ (DH3) và đều nhỏ hơn giới hạn chất lượng trầm tích theo QCVN 43:2017/BTNMT. Hàm lượng trung bình của các kim loại giảm dần theo thứ tự Zn >
Pb >
Cu >
As >
Cd. Chỉ số tích lũy địa chất (Igeo) được tính toán và đã chỉ ra cửa sông Diêm Hộ là khu vực có mức độ tích lũy kim loại nặng cao hơn hai cửa sông còn lại, đặc biệt là Pb, Cd và Cu.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.

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