AI Article Synopsis
- The study presents a method for analyzing 9 chlorinated acid herbicides in soil and vegetation using reversed-phase liquid chromatography, negative electrospray ionization, and tandem mass spectrometry.
- A 20 g soil sample is extracted with a basic solution, then acidified and separated using chloroform, with vegetation samples undergoing additional purification.
- Average recovery rates for herbicides were generally high, ranging from 72-107% in soil and 53-80% in vegetation, though 2,4-DB showed lower recoveries in both matrices.
Article Abstract
The method presented uses reversed-phase liquid chromatography with negative electrospray ionization and tandem mass spectrometry to analyze 9 chlorinated acid herbicides in soil and vegetation matrixes: clopyralid, dicamba, MCPP, MCPA, 2,4-DP, 2,4-D, triclopyr, 2,4-DB, and picloram. A 20 g portion is extracted with a basic solution and an aliquot acidified and micropartitioned with 3 mL chloroform. Vegetation samples are subjected to an additional cleanup with a mixed-mode anion exchange solid-phase extraction cartridge. Two precursor product ion transitions per analyte are measured and evaluated to provide the maximum degree of confidence in results. Average recoveries for 3 different soil types tested ranged from 72 to 107% for all compounds with the exception of 2,4-DB at 56-99%. Average recoveries for the 3 different vegetation types studied were lower and ranged from 53 to 80% for all compounds.
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