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earth GRL

Organic Geochemistry Research Laboratory
LCPD: Acetamide Pesticide Method


Acetamide herbicides are used to control weeds in row crops such as corn and soybeans. Acetamide herbicides and their degradates are common contaminants in surface and groundwater. Some of the widely detected acid degradates are on the USEPA contaminant candidate list (CCL).


  • Sample collection requirements: 3-125mL (4 oz) amber glass bottles with Teflon lined caps per sample.
  • Instrumentation: Liquid Chromatography/Tandem Mass Spectrometry
  • Method established in the USGS Laboratory Evaluation Policy (LEP)
  • Data results uploaded to QWDX upon request

Compound Name Reporting Limit Parameter Code Method Code USGS Method Report CAS #
Acetochlor 0.02 μg/L 49260 LCM45 OF-03-173 34256-82-1
*Acetochlor deschloro 0.02 μg/L 63778 LCM01 N/A --
*Acetochlor ESA (ethane sulfonic acid) 0.02 μg/L 61029 LCM45 OF-03-173 187022-11-3
*Acetochlor hydroxy 0.02 μg/L 63784 LCM01 N/A --
*Acetochlor OXA (oxanilic acid) 0.02 μg/L 61030 LCM45 OF-03-173 184992-44-4
*Acetochlor SAA (sulfynil acetic acid) 0.02 μg/L 62847 LCM45 OF-03-173 --
*Acetochlor/metolachlor-2nd amide 0.02 μg/L 63782 LCM01 --
*Acetochlor/metolachlor ESA-2nd amide 0.02 μg/L 62850 LCM45 OF-03-173 --
Alachlor 0.02 μg/L 46342 LCM45 OF-03-173 15972-60-8
*Alachlor-2nd amide 0.02 μg/L 63781 LCM01 N/A --
*Alachlor dechloro 0.02 μg/L 63777 LCM01 N/A --
*Alachlor ESA 0.02 μg/L 50009 LCM45 OF-03-173 140939-15-7
*Alachlor OXA 0.02 μg/L 61031 LCM45 OF-03-173 --
*Alachlor SAA 0.02 μg/L 62848 LCM45 OF-03-173 --
*Alachlor ESA- 2nd amide 0.02 μg/L 62849 LCM45 OF-03-173 --
*Alachlor hydroxy 0.02 μg/L 63783 LCM01 N/A --
Dimethenamid 0.02 μg/L 61588 LCM45 OF-03-173 87674-68-8
*Dimethenamid dechloro 0.02 μg/L 63779 LCM01 N/A --
*Dimethenamid ESA 0.02 μg/L 61951 LCM45 OF-03-173 205939-58-8
*Dimethenamid OXA 0.02 μg/L 62482 LCM45 OF-03-173 --
*Dimethenamid hydroxy 0.02 μg/L 64045 LCM01 N/A --
Flufenacet 0.02 μg/L 62481 LCM45 OF-03-173 142459-58-3
*Flufenacet ESA 0.02 μg/L 61952 LCM45 OF-03-173 201668-31-7
*Flufenacet OXA 0.02 μg/L 62483 LCM45 OF-03-173 --
Metolachlor 0.02 μg/L 39415 LCM45 OF-03-173 51218-45-2
*Metolachlor dechloro 0.02 μg/L 63780 LCM01 N/A --
*Metolachlor ESA 0.02 μg/L 61043 LCM45 OF-03-173 17118-09-5
*Metolachlor OXA 0.02 μg/L 61044 LCM45 OF-03-173 152019-73-3
*Metolaclor hydroxy 0.02 μg/L 63785 LCM01 N/A 131068-72-9
Propachlor 0.02 μg/L 04024 LCM45 OF-03-173 1918-16-7
*Propachlor OXA 0.02 μg/L 62767 LCM45 OF-03-173 --
*Propachlor ESA 0.05 μg/L 62766 LCM45 OF-03-173 123732-85-4
*degradation product

USGS Method Approved Report

Lee, E.A., Strahan, A.P., 2003, Methods of analysis by the U.S. Geological Survey Organic Geochemistry Research Group-Determination of acetamide herbicides and their degradation products in water using online solid-phase extraction and high-performance liquid chromatography/mass spectrometry, U.S. Geological Survey Open-File Report 03-173, pp. 17.

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