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Decrease in herbicide concentrations and affected factors in lagoons located around Lake Biwa.

M Sudo¹, M Nishino, T Okubo

¹School of Environmental Science, The University of Shiga Prefecture, 2500 Hassaka Hikone, 522-8533, Japan. sudo@ses.usp.ac.jp

Water Science and Technology : a Journal of the International Association on Water Pollution Research

|April 6, 2006

Summary

Pesticide levels in Lake Biwa lagoons remained below safety limits. Shorter water residence times and higher chlorophyll-a levels accelerated herbicide breakdown, reducing contamination.

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Area of Science:

Environmental Chemistry
Ecotoxicology
Limnology

Background:

Paddy-use herbicides can contaminate aquatic ecosystems.
Understanding herbicide fate in lagoons is crucial for water quality management.

Purpose of the Study:

To assess contamination levels of paddy-use herbicides in four lagoons around Lake Biwa.
To investigate the factors influencing herbicide concentration changes, specifically hydraulic residence time (HRT) and chlorophyll-a concentrations.

Main Methods:

Weekly water sampling at lagoon outlets from May to June.
Analysis of twelve monitored herbicides.
Calculation of herbicide concentration half-lives.
Correlation analysis with lagoon characteristics (HRT, chlorophyll-a).

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Main Results:

Twelve herbicides were detected, but maximum concentrations were below Japanese water-supply guidelines.
Herbicide concentrations exhibited shorter half-lives in lagoons with shorter HRT, indicating effective dilution.
Lagoons with higher chlorophyll-a concentrations showed shorter half-lives, suggesting enhanced biological degradation.

Conclusions:

Hydraulic residence time and chlorophyll-a concentration are key factors in reducing herbicide contamination in lagoons.
Influent water replacement and biological degradation contribute significantly to herbicide removal.