Estimation of sorption coefficients for fungicides in soil and turfgrass thatch

Curtis James Dell, C. S. Throssell, M. Bischoff, R. F. Turco

Research output: Contribution to journalArticle

40 Citations (Scopus)

Abstract

Environmental fates of turf-applied fungicides are not well understood. The role of thatch as a sorptive surface for fungicides has not been evaluated. Thatch may decrease mobility of fungicides and decrease their potential to be transported off-site. Batch type sorption studies were conducted to determine sorption coefficients (K(f)) for the fungicides triadimefon, [1-(4-chlorophenoxy)-3,3-dimethyl 1-1-(1H-1,2,4-triazol-1-g- l)butanone], vinclozolin [3-(3,5-dichlorophenyl)-5-methyl-5-vinyl-1,3- oxazolidine-2,4-dione], and chloroneb (1,4-dichloro-2,5-dimethoxybenzone) in thatch and in the underlying soil. The K(f) values also were derived from octanol/water partitioning coefficients (K(ow)) for these and five other compounds. All K(ow) values were determined with reverse-phase high pressure liquid chromatography (HPLC) and calculated from physical properties of the fungicides. The K(f) values [μmol(l-n) L(n)kg-1] determined from isotherm data for thatch and soil (respectively) were 90 and 10 for triadimefon, 163 and 21 for chloroneb, and 431 and 47 for vinclozolin. When K(f) values were adjusted for organic C content of the sample, the resulting K(oc) values were similar for thatch and soil. The K(oc) values estimated from HPLC-derived K(ow) values were consistently less than those obtained using batch isotherm methods. The K(ow) values calculated from physical properties of the fungicides were poorly correlated with measured values. The HPLC method appears to be useful for determining sorption coefficients. Results indicate that thatch substantially increases fungicide sorption, which, in turn, decreases the potential for these compounds to migrate off site.

Original languageEnglish (US)
Pages (from-to)92-96
Number of pages5
JournalJournal of Environmental Quality
Volume23
Issue number1
DOIs
StatePublished - Jan 1 1994

Fingerprint

Fungicides
fungicide
Sorption
sorption
Soils
High pressure liquid chromatography
soil
liquid chromatography
Isotherms
isotherm
Physical properties
physical property
environmental fate
partitioning

All Science Journal Classification (ASJC) codes

  • Environmental Engineering
  • Water Science and Technology
  • Waste Management and Disposal
  • Pollution
  • Management, Monitoring, Policy and Law

Cite this

Dell, Curtis James ; Throssell, C. S. ; Bischoff, M. ; Turco, R. F. / Estimation of sorption coefficients for fungicides in soil and turfgrass thatch. In: Journal of Environmental Quality. 1994 ; Vol. 23, No. 1. pp. 92-96.
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abstract = "Environmental fates of turf-applied fungicides are not well understood. The role of thatch as a sorptive surface for fungicides has not been evaluated. Thatch may decrease mobility of fungicides and decrease their potential to be transported off-site. Batch type sorption studies were conducted to determine sorption coefficients (K(f)) for the fungicides triadimefon, [1-(4-chlorophenoxy)-3,3-dimethyl 1-1-(1H-1,2,4-triazol-1-g- l)butanone], vinclozolin [3-(3,5-dichlorophenyl)-5-methyl-5-vinyl-1,3- oxazolidine-2,4-dione], and chloroneb (1,4-dichloro-2,5-dimethoxybenzone) in thatch and in the underlying soil. The K(f) values also were derived from octanol/water partitioning coefficients (K(ow)) for these and five other compounds. All K(ow) values were determined with reverse-phase high pressure liquid chromatography (HPLC) and calculated from physical properties of the fungicides. The K(f) values [μmol(l-n) L(n)kg-1] determined from isotherm data for thatch and soil (respectively) were 90 and 10 for triadimefon, 163 and 21 for chloroneb, and 431 and 47 for vinclozolin. When K(f) values were adjusted for organic C content of the sample, the resulting K(oc) values were similar for thatch and soil. The K(oc) values estimated from HPLC-derived K(ow) values were consistently less than those obtained using batch isotherm methods. The K(ow) values calculated from physical properties of the fungicides were poorly correlated with measured values. The HPLC method appears to be useful for determining sorption coefficients. Results indicate that thatch substantially increases fungicide sorption, which, in turn, decreases the potential for these compounds to migrate off site.",
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Estimation of sorption coefficients for fungicides in soil and turfgrass thatch. / Dell, Curtis James; Throssell, C. S.; Bischoff, M.; Turco, R. F.

In: Journal of Environmental Quality, Vol. 23, No. 1, 01.01.1994, p. 92-96.

Research output: Contribution to journalArticle

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