CHARACTERISTICS OF MARINE ENVIRONMENTAL GEOCHEMISTRY 0-100 M WATER DEPTH FROM HUẾ TO BÌNH ĐỊNH

Mai Trọng Nhuận¹, Vũ Trường Sơn², Lê Anh Thắng²,

Trần Đăng Quy¹, Nguyễn Tài Tuệ¹, Hoàng Văn Tuấn¹

¹VNU University of Natural Sciences, 334 Nguyễn Trãi, Thanh Xuân, Hanoi

²Northern Center for Planning and Marine Natural Resources and Environment Survey,
125 Trung Kính, Cầu Giấy, Hanoi

Abstract: Study of characteristics of marine environmental geochemistry plays an important role in establishing baseline data for monitoring the variation of heavy metal concentrations and assessing their potential influence on marine organisms. The purpose of this study is to clarify the characteristics of environmental geochemistry of seawater and marine sediments from Huế to Bình Định at a water depth of 0-100 m. The study results showed that seawater and marine sediments are of weak oxidizing and alkaline affinity. In the seawater environment, there were negative correlations of Eh and pH with heavy metals (Cu, Pb, Zn, Cd, Hg). NO₃^- and heavy metal concentrations tended to decrease with depth and from the shallow water, nearshore to deep water, offshore. In the marine sedimentary environment, organic carbon content and mud proportion have positive correlations with most heavy metals, demonstrating surface absorptive capacity of heavy matals, as well as their distribution. Although, concentration of some heavy metals was higher than that in seawater and marine sediments of the world, but was still lower than allowed limit values specified in Vietnamese Marine Environmental Quality Guideline.

Keywords: Marine environmental geochemistry, Huế - Bình Định, heavy metals, marine sediment.

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