HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Figures Only Full Text Free Full Text (PDF) Free Alert me when this article is cited Alert me if a correction is posted Services Related articles in JEQ Similar articles in this journal Similar articles in ISI Web of Science Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via ISI Web of Science (8) Citing Articles via Google Scholar Google Scholar Articles by Krutz, L. J. Articles by Tierney, D. P. Search for Related Content PubMed PubMed Citation Articles by Krutz, L. J. Articles by Tierney, D. P. Agricola Articles by Krutz, L. J. Articles by Tierney, D. P. Related Collections Agricultural Pesticides Surface Water Quality Best Management Practices Pesticides

TECHNICAL REPORTS

Surface Water Quality

Infiltration and Adsorption of Dissolved Atrazine and Atrazine Metabolites in Buffalograss Filter Strips

^a Dep. of Soil and Crop Sci., Texas Agric. Exp. Stn., Texas A&M Univ., College Station, TX 77843
^b Dep. of Soil and Crop Sci., Texas Cooperative Extension, Texas A&M Univ., College Station, TX 77843
^c Blackland Res. Center, Texas Agric. Exp. Stn., Temple, TX
^d Environ. Stewardship and Regulatory Policy, Syngenta Crop Protection, P.O. Box 18300, Greensboro, NC

^* Corresponding author (lkrutz{at}ag.tamu.edu).

Received for publication January 24, 2003. Vegetated filter strips (VFS) potentially reduce the off-site movement of herbicides from adjacent agricultural fields by increasing herbicide mass infiltrated (M_inf) and mass adsorbed (M_as) compared with bare field soil. However, there are conflicting reports in the literature concerning the contribution of M_as to the VFS herbicide trapping efficiency (TE). Moreover, no study has evaluated TE among atrazine (6-chloro-N-ethyl-N'-isopropyl-[1,3,5]triazine-2,4-diamine) and atrazine metabolites. This study was conducted to compare TE, M_inf, and M_as among atrazine, diaminoatrazine (DA, 6-chloro-[1,3,5]triazine-2,4-diamine), deisopropylatrazine (DIA, 6-chloro-N-ethyl-[1,3,5]triazine-2,4-diamine), desethylatrazine (DEA, 6-chloro-N-isopropyl-[1,3,5]triazine-2,4-diamine), and hydroxyatrazine (HA, 6-hydroxy-N-ethyl-N'-isopropyl-[1,3,5]triazine-2,4-diamine) in a buffalograss VFS. Runoff was applied as a point source upslope of a 1- x 3-m microwatershed plot at a rate of 750 L h^-1. The point source was fortified at 0.1 µg mL^-1 atrazine, DA, DIA, DEA, and HA. After crossing the length of the plot, water samples were collected at 5-min intervals. Water samples were extracted by solid phase extraction and analyzed by high performance liquid chromatography (HPLC) photodiode array detection. During the 60-min simulation, TE was significantly greater for atrazine (22.2%) compared with atrazine metabolites (19.0%). Approximately 67 and 33% of the TE was attributed to M_inf and M_as, respectively. These results demonstrate that herbicide adsorption to the VFS grass, grass thatch, and/or soil surface is an important retention mechanism, especially under saturated conditions. Values for M_as were significantly higher for atrazine compared with atrazine's metabolites. The M_as data indicate that atrazine was preferentially retained by the VFS grass, grass thatch, and/or soil surface compared with atrazine's metabolites.

Abbreviations: DA, diaminoatrazine • DEA, desethylatrazine • DIA, deisopropylatrazine • HA, hydroxyatrazine • HPLC, high performance liquid chromatography • TE, trapping efficiency • VFS, vegetated filter strips

Related articles in JEQ:

This Issue in Journal of Environmental Quality

JEQ 2003 32: 1931-1938. [Full Text]