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A stochastic simulation procedure for selecting herbicides with minimum environmental impact.

Ben D Giudice1, Arash Massoudieh, Xinjiang Huang

  • 1Department of Civil and Environmental Engineering, University of California-Davis, One Shields Avenue, Davis, California 95616, USA.

Environmental Science & Technology
|February 21, 2008
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Summary

A model simulating roadside herbicide runoff found that toxicity risks vary significantly by region and highway type. Some herbicides pose higher environmental risks, informing safer application practices for water quality protection.

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Area of Science:

  • Environmental Science
  • Ecotoxicology
  • Water Quality Modeling

Background:

  • Roadside herbicides are essential for vegetation management but can enter aquatic ecosystems via stormwater runoff.
  • Understanding the environmental fate and toxicity of these herbicides is crucial for ecological risk assessment.

Purpose of the Study:

  • To develop and apply a stochastic environmental transport model for assessing roadside herbicide concentrations in stormwater runoff.
  • To evaluate the frequency of potential toxicity (FPT) of 33 herbicides to aquatic organisms across different geographical regions and highway types.
  • To identify herbicides with lower environmental impact based on predicted toxicity and usage patterns.

Main Methods:

  • A Monte Carlo technique was used to stochastically apply a mathematical environmental transport model at the site scale.
  • Probability distribution functions for model inputs were derived from field surveys, laboratory sorption data, and literature.
  • Predicted herbicide concentrations were compared against EPA acute toxicity endpoints for aquatic organisms.

Main Results:

  • Frequencies of potential toxicity (FPTs) for individual herbicides varied up to 36% between regions and highway geometries.
  • At maximum application rates, 16 out of 33 herbicides showed average FPTs exceeding 50%.
  • At minimum application rates, 20 out of 33 herbicides had average FPTs below 50%.

Conclusions:

  • Herbicide runoff toxicity varies geographically and by highway design, necessitating region-specific risk assessments.
  • Selected herbicides demonstrate greater environmental acceptability regarding acute aquatic toxicity and other environmental effects.
  • The developed decision support system aids in evaluating the water quality impacts of different herbicide application strategies.