Full TGIF Record # 30954
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Web URL(s):https://dl.sciencesocieties.org/publications/jeq/pdfs/23/3/JEQ0230030542
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Publication Type:
i
Refereed
Author(s):Veeh, R. H.; Inskeep, W. P.; Roe, F. L.; Ferguson, A. H.
Author Affiliation:Engineering Res. Ctr.; Dep. of Plant, Soil and Environmental Science, Montana State Univ., Bozeman, MT
Title:Transport of chlorsulfuron through soil columns
Source:Journal of Environmental Quality. Vol. 23, No. 3, May/June 1994, p. 542-549.
Publishing Information:Madison, Wisconsin: American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America
# of Pages:8
Keywords:TIC Keywords: Soils; Chlorsulfuron; Transport (chemical)
Abstract/Contents:"Chlorsulfuron [2-chloro-N-[[(4-methoxy-6-methyl-1,3,5- triazin-2-yl)amino]carbonyl]-benzenesulfonamide] is an anionic sulfonylurea herbicide with high soil persistence; consequently, there is interest in predicting its mobility in agricultural soils. The objectives of this study were to determine the transport characteristics of chlorsulfuron in disturbed and undisturbed soil columns and evaluate the capabilities of LEACHM (Leaching Estimation and Chemistry Model) for predicting chlorsulfuron transport. Soil column experiments were conducted with two Montana soils (Amsterdam silt loam, file-silty, mixed Typic Haploboroll, and Haverson silty clay loam, fine-loamy, mixed (calcareous), mesic Ustic Torrifluvent) under unsaturated flow conditions. Unit gradient was established in all columns by balancing surface water input to outflow at the bottom of each column through a stainless steel porous plate connected to a vacuum chamber containing a friction collecter. A nonlinear least squares approach (CXTFIT) was used to fit breakthrough curves (BTCs) for Br- and 14C-lableld chlorsulfuron using the linear equilibrium adsorption model (i.e., nonequilibrium assumption). Observed Br- BTCs were best described by the bicontinuum model indicating physical non equilibrium during transport. The best fit to observed chlorsulfuron was obtained with with the bicontinuum model using the dispersion coefficient optimized (i.e., fixed) from the Br- BTCs. LEACHM was used to generate predicted BTCs for chlorsulfuron utilizing independently measured or estimated soil physical parameters as input data. Predicted BTCs utilizing the Br- -derived dispersion coefficient (D) and the biocontiuum model-derived partition coefficient (Koc) did not adequately reflect observed BTCs primarily because the current version of LEACHM has no capability for accepting input parameters relating to nonequilibrium conditions. The D and Koc values for chlorsulfuron BTCs derived from the LEA model improved predictions; however, it is important to note that LEA-derived D and Koc values for chlorsulfuron BTCs essentially compensate for nonequilibrium behavior. Finally, the experimentally determined chlorsulfuron BTCs confirmed the high mobility of this chemical at neutral soil pH values."
Language:English
References:41
Note:Tables
Graphs
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Veeh, R. H., W. P. Inskeep, F. L. Roe, and A. H. Ferguson. 1994. Transport of chlorsulfuron through soil columns. J. Environ. Qual. 23(3):p. 542-549.
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https://dl.sciencesocieties.org/publications/jeq/pdfs/23/3/JEQ0230030542
    Last checked: 12/12/2016
    Requires: PDF Reader
    Notes: Item is within a limited-access website
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