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- Title
TOXICITY OF HERBICIDES IN HIGHWAY RUNOFF.
- Authors
Xinjiang Huang; Fong, Stephanie; Deanovic, Linda; Young, Thomas M.
- Abstract
Previous field monitoring at two highway sites found highway-applied herbicides in storm water runoff at maximum concentrations ranging from 10 µg/L for glyphosate and diuron to as high as 200 µg/L for oryzalin. To determine whether these herbicides at these concentrations can cause any toxicity to aquatic organisms, a standard toxicity study was conducted. Storm water was collected along Highway 37, Sonoma County, California, USA, and the herbicides isoxaben, oryzalin, diuron, clopyralid, and glyphosate were spiked into the storm water at the highest concentrations observed during the five previous field-monitoring campaigns. Three different toxicity studies were conducted and the results showed the following: No significant reduction in reproduction or increase in mortality relative to the control for an 8-d Ceriodaphnia (water flea) toxicity test; no significant increase in mortality or decrease in biomass compared to the control during a 7-d Pimephales (fish) toxicity test; and, in a 96-h Selenastrum (algae) toxicity test, both the 10-µg/L diuron treatment and the combined 50-µg/L isoxaben plus 200-µg/L oryzalin treatment produced significant (p < 0.05) reductions in algal growth compared to the controls, although the 30-µg/L clopyralid or 10-µg/L glyphosate treatments did not exhibit any toxic effects.
- Subjects
HERBICIDES; GLYPHOSATE; AQUATIC organisms; RUNOFF; STORM water retention basins
- Publication
Environmental Toxicology & Chemistry, 2005, Vol 24, Issue 9, p14
- ISSN
0730-7268
- Publication type
Article
- DOI
10.1897/04-174R.1