Water Quality Assessment and Eutrophic Classification of Hanoi Lakes Using Different Indices

Date Received: Nov 05, 2020

Date Published: Dec 31, 2021

DOI: https://doi.org/10.31817/vjas.2021.4.4.03

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Issue: Vol. 4 No. 4 (2021): Vietnam Journal of Agricultural Sciences

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NATURAL RESOURCES AND ENVIRONMENT

How to Cite:

Ha, N., Dzung, D., Hang, H., Huy, T., & Tu, N. (2021). Water Quality Assessment and Eutrophic Classification of Hanoi Lakes Using Different Indices. Vietnam Journal of Agricultural Sciences, 4(4), 1229–1240. https://doi.org/10.31817/vjas.2021.4.4.03

Water Quality Assessment and Eutrophic Classification of Hanoi Lakes Using Different Indices

Nguyen Thi Thu Ha (*) 1 , Dinh Tien Dzung 2 , Ho Thi Thuy Hang 1 , Trinh Quang Huy 1   , Nguyen Ngoc Tu 1

  • Corresponding author: nguyenngoctu@vnua.edu.vn
  • 1 Faculty of Natural Resources and Environment, Vietnam National University of Agriculture, Hanoi 131000, Vietnam
  • 2 Center for Analysis and Transfer of Environmental Technology, Institute of Agricultural Environment , Hanoi 130760, Vietnam

    • Keywords

    Phytoplankton, Hanoi lakes, Water Quality Index, Eutrophication Index

    Abstract


    The trophic levels in urban lakes are typically based on the forms of nutrition and phytoplankton communities in the lakes. In this study, comparisons between eutrophication indices and the water quality index (VN-WQI) were used to classify the water quality of 20 lakes in Hanoi, Vietnam. The results showed that the water quality ranged from very bad to poor. High levels of the eutrophication phenomenon in terms of total N and P were observed in all sampling sites. Cyanobacteria was the dominate algae phylum making up 65.78% of the total population, whereas Chlorophyta (including 19 genera) was the most diverse phylum. The density of the algae was 5,000-14,000 cells mL-1 and the chlorophyll-a level was 10-40 µg L-1. Based on this information, the water quality levels in the lakes were classified from eutrophic to polytrophic. The Trophic Status Index (TSI) and Trophic Level Index (TLI) values ​​were 66.9-86.0 and 54.4-76.0 points, respectively, corresponding from eutrophic to extreme-trophic. Classifications based on algae community structure indices were from oligotrophic to eutrophic, similar and consistent with the TLI classifications. According to the results in this study, the TLI was found to be more accurate and precise than the other indices. It is recommended that the TLI is an applicable tool to classify eutrophication in urban lakes.

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