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Survey for Picloram in North Dakota Groundwater

Published online by Cambridge University Press:  12 June 2017

Rodney G. Lym  and
Calvin G. Messersmith
Rodney G. Lym
Affiliation:
Dep. Agron., N.D. State Univ., Fargo, ND 58105
Calvin G. Messersmith
Affiliation:
Dep. Agron., N.D. State Univ., Fargo, ND 58105
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Abstract

Wells and streams in 10 North Dakota counties were surveyed for picloram (4-amino-3,5,6-trichloro-2-pyridinecarboxylic acid), the major herbicide used to control leafy spurge (Euphorbia esula L. # EPHES). Three rivers and 144 wells were sampled in 1985. Picloram concentration ranged from <0.1 to 12.4 ppb in the water from five wells in five counties and from <0.1 to 6 ppb in two rivers. An additional 44 wells were sampled in 1986; they were located within 2 km of the five wells where picloram was detected in 1985. Picloram concentrations in 1986 ranged from non-detectable to 6.7 ppb in the original contaminated wells and was 0.97 ppb in water from one of the additional 44 wells. Picloram concentration in the river water was lower in 1986 than in 1985 but was detected farther downstream. All contaminated wells were within 1.5 km of an area treated for leafy spurge, but picloram had been spilled accidentally or misapplied near all but one of the wells. The concentrations detected were at least 100 times below suggested tolerance levels for water.

Keywords

Euphorbia esula L.water qualityEPHES
Type
Symposium
Information
Weed Technology , Volume 2 , Issue 2 , April 1988 , pp. 217 - 222
Copyright
Copyright © 1988 by the Weed Science Society of America 

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References

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