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United States Department of Agriculture

Agricultural Research Service

Title: Simultaneous Determination of Nicosulfuron and Imazethapyr in Surface and Ground Water from Agricultural Fields

item Steinheimer, Thomas
item Scoggin, Kenwood

Submitted to: American Chemical Society Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: August 24, 1996
Publication Date: N/A

Technical Abstract: Imazethapyr, an imidazolinone (IMI) herbicide, is used to control grasses and broadleaf weeds in soybeans. Nicosulfuron, a sulfonylurea (SU) herbicide, is used to control grasses in corn. Both are extracted simultaneously from acidified water on 1000-mg cyclohexyl cartridges and separated on a C18 LC column chemically shielded to enhance separations of organic bases. Resolution is achieved through tertiary acetonitrile-water gradients at pH 7.0 and 3.0 in order to isolate the analyte peaks from each other and from co-extracted herbicide-derived chemicals. Detection of both analytes is by photodiode-array simultaneously at 254, 220, and 199 nm. Two-liter water samples are reduced to a 1.0 mL final volume in initial-conditions mobile-phase. A 250-uL injection volume furnishes a nominal detection limit of 5 ug L**-1. Quantitation is via external-standard multi-point calibration. Confirmation of identity is by HPLC-MS. Method validation is achieved through spike-recovery studies.

Last Modified: 4/22/2015
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