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Supercritical CO2 Fluid Extraction of Imazaquin From Soil

Published online by Cambridge University Press:  12 June 2017

Krishna N. Reddy  and
Martin A. Locke
Krishna N. Reddy
Affiliation:
South. Weed Sci. Lab., USDA-ARS, Stoneville, MS 38776
Martin A. Locke
Affiliation:
South. Weed Sci. Lab., USDA-ARS, Stoneville, MS 38776
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Abstract

Feasibility of supercritical CO2 fluid extraction of imazaquin from spiked soil (3.21 μmol kg-1) as an alternative to a conventional extraction method was investigated. The supercritical fluid extraction method involved single-step extraction of herbicide from soil with no further sample cleanup procedures. Extraction parameters were optimized for maximum herbicide recovery. Adding water as a modifier to air-dried soil significantly improved herbicide recovery. Extracting a 1-g soil sample with supercritical CO2 at 0.80 g ml-1 density and 3 ml min-1 flow rate, 80 C extraction temperature, 6 min static extraction followed by 25 min dynamic extraction, and analyte trap temperature of 40 C was optimum for maximum herbicide recovery. When optimum supercritical fluid extraction conditions were used, imazaquin recovery from three texturally different soils ranged from 55 to 64%, which was comparable to a conventional extraction method (63%). The supercritical fluid extraction method consumed 4 ml methanol and 75 ml supercritical CO2 and took approximately 1 h for sample extraction.

Keywords

Imazaquin, 2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-3-quinolinecarboxylic acidHerbicide residueHPLCimidazolinone herbicide
Type
Soil, Air, and Water
Information
Weed Science , Volume 42 , Issue 2 , June 1994 , pp. 249 - 253
Copyright
Copyright © 1994 by the Weed Science Society of America 

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