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Surfactant-Altered Rates of Chlorimuron and Metsulfuron Photolysis in Sunlight

Published online by Cambridge University Press:  12 June 2017

Sandra M. Thomas  and
S. Kent Harrison
Sandra M. Thomas
Affiliation:
Dep. Agron., Ohio State Univ., 2021 Coffey Road, Columbus, OH 43210
S. Kent Harrison
Affiliation:
Dep. Agron., Ohio State Univ., 2021 Coffey Road, Columbus, OH 43210
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Abstract

Two nonionic surfactants altered photolysis rates of chlorimuron and metsulfuron in aqueous solutions and on glass slides exposed to sunlight. Photolysis of both herbicides followed first-order kinetics over an 8-day exposure period. Chlorimuron half-lives in solution were 5.8, 3.7, and 2.7 days in the presence of no surfactant, oxysorbic, and octoxynol, respectively. The extrapolated half-life of metsulfuron in solution with no surfactant was 15.7 days, compared to half-lives of 2.9 and 1.5 days in solutions containing oxysorbic or octoxynol, respectively. With the exception of metsulfuron in the absence of a surfactant, rates of chlorimuron and metsulfuron photolysis on glass slides were approximately two- to fourfold slower, and surfactants had little or no effect on herbicide photolysis rates compared to those in aqueous solution. Extrapolated half-lives on glass ranged from 9.9 to 12.5 days for chlorimuron and from 7.6 to 11.7 days for metsulfuron. Presence of oxysorbic or octoxynol did not greatly alter rates of riboflavin-sensitized herbicide photolysis on glass but did increase photolysis rates of metsulfuron in aqueous solution containing riboflavin.

Keywords

Chlorimuron, 2-[[[[(4 - chloro - 6 - methoxy - pyrimidinyl)-amino]carbonyl]amino]sulfonyl]benzoic acidmetsulfuron, 2-[[[[(4-methoxy-6-methyl)-1,3,5-triazin-2-yl)amino]-carbonyl]amino]sulfonyl]benzoic acidoxysorbic, polyoxyethylene sorbitan monooleateoctoxynol, isoctyl phenyl polyethoxy ethanolAdditivesherbicide degradationphotodecompositionoxysorbicoctoxynolriboflavin
Type
Soil, Air, and Water
Information
Weed Science , Volume 38 , Issue 6 , November 1990 , pp. 602 - 606
Copyright
Copyright © 1990 by the Weed Science Society of America 

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References

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