Phân Bố Các Loại Thủy Ngân Trong Cột Nước Của Các Môi Trường Nước Được Phân Tầng Vĩnh Viễn

Pleiades Publishing Ltd - Tập 58 - Trang 28-37 - 2018
S. V. Pakhomova1,2,3, H. F. V. Braaten4, E. V. Yakushev1,4, E. A. Protsenko1,4
1Shirshov Institute of Oceanology, Russian Academy of Sciences, Moscow, Russia
2Norwegian Institute for Air Research (NILU), Kjeller, Norway
3Norwegian University of Science and Technology, Trondheim, Norway
4Norwegian Institute for Water Research (NIVA), Oslo, Norway

Tóm tắt

Cấu trúc sinh hóa của ba khu vực nước được phân tầng vĩnh viễn đã được nghiên cứu: một bể nước biển (biển Đen), một cửa sông (học fjord Hunnbunn), và một hồ nước ngọt (Nordbytjernet), với trọng tâm vào sự phân bố của methylmercury (MeHg) và tổng lượng thủy ngân (THg). Nồng độ THg tương tự nhau trong bể nước biển (0,2–1,8 ng/L) và hồ nước ngọt (0,8–1,2 ng/L), nhưng cao hơn đáng kể ở cửa sông (0,6–9,4 ng/L). Sự gia tăng nồng độ MeHg và tỷ lệ MeHg/THg được tìm thấy trong vùng redox ở cả ba khu vực, cho thấy sự sản xuất MeHg bởi vi khuẩn trong pha nước. Trong hồ và cửa sông, nồng độ MeHg tối đa và tỷ lệ MeHg/THg được phát hiện trong các mẫu nằm gần nhất với trầm tích đáy, có khả năng là do sự hình thành MeHg trong trầm tích bề mặt và sau đó khuếch tán vào các lớp nước phía trên.

Từ khóa

#methylmercury; tổng lượng thủy ngân; phân tầng vĩnh viễn; môi trường nước; sinh hóa học

Tài liệu tham khảo

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