CHARACTERISTICS OF MARINE ENVIRONMENTAL GEOCHEMISTRY FROM HA TINH TO QUANG NAM (60-100M WATER DEPTH)

Authors

  • Luong Le Huy* Sea and Island Research Center - VNU University of Science
  • Mai Trong Nhuan Faculty of Geology - VNU University of Science
  • Tran Dang Quy Faculty of Geology - VNU University of Science
  • Hoang Van Tuan Sea and Island Research Center - VNU University of Science
  • Quach Manh Dat Vietnam National University Hanoi
  • Nguyen Duc Hoai VNU University of Science
  • Nguyen Tai Tue Faculty of Geology - VNU University of Science

DOI:

https://doi.org/10.15625/0866-7187/38/2/8603

Keywords:

Marine environmental geochemistry, Seawater, Marine sediment, Ha Tinh, Quang Nam

Abstract

The aim of this study is to elucidate the characteristics of marine environmental geochemistry from Ha Tinh - Quang Nam (60-100m water depth) based on analysis of geochemical parameters of seawater and surface sediments. Surface sediments that are high in absorbed capacity of toxic substances mainly accumulated in northern study area. Seawater dominantly characterized by weak alkaline-weak oxidation and contained biodegradable organic materials. Almost anion and chemical element concentrations in seawater tended to decrease with depth, with an exception for SO42-, Br-, I- concentrations that had an opposite trend, increasing with depth and B, Hg concentrations displayed a complex variation. Sedimentary environments were highly predominant by weak alkaline-strong oxidizing features and carbonate-rich materials. Concentrations of anions and chemical elements tended to be higher in central area in comparison to northern and southern regions, and positively correlated with fine sediment compositions. Organochlorine pesticides (OCPs) concentration decreased with sediment depth, whilst polychlorinated biphenyls (PCBs) concentration had no clear trend. The organic material, heavy metal, OCPs and PCBs concentrations in seawater and sediments were all lower than environmental standards. The present results have provided important baseline data for monitoring marine environment quality and protecting the marine ecosystem of Ha Tinh - Quang Nam Sea.

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Published

2016-04-09

How to Cite

Huy*, L. L., Nhuan, M. T., Quy, T. D., Tuan, H. V., Dat, Q. M., Hoai, N. D., & Tue, N. T. (2016). CHARACTERISTICS OF MARINE ENVIRONMENTAL GEOCHEMISTRY FROM HA TINH TO QUANG NAM (60-100M WATER DEPTH). Vietnam Journal of Earth Sciences, 38(2), 217–230. https://doi.org/10.15625/0866-7187/38/2/8603

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