trace analysis of fluroxypyr-meptyl and fluroxypyr in wheat and soil ecosystem based on ion column-solid phase extraction method and liquid chromatography-tandem mass spectrometry

The study developed a novel purification procedure with ion column-solid-phase extraction (ic-spe) for analysis of fluroxypyr-meptyl and fluroxypyr in wheat samples by liquid chromatography tandem mass spectrometry. during the sample preparation, ic-spe method was carried out with the column containing the selection of adsorbent materials and with the help of syringes to pull and push extract through adsorbents. based on a modified quick, easy, cheap, effective, rugged, and safe sample preparation, the ratio of water (containing 0.1% formic acid) to extraction solvent, cleanup adsorbents, and ic-spe cycle times was studied for analyzing the residues in wheat grain, seedling, straw, and soil. the mean recoveries ranged from 82 to 107% with relative standard deviations below 10% for all matrices. good linearity was obtained at the range of 0.005~1.0 mg l−1 for the analytes in the selected matrices. the limit of quantification for target analytes was between 0.05 and 0.1 mg kg−1. a field trial including dissipation kinetics and terminal residue study was conducted under open field conditions at three sites during the year of 2015–2016 to monitor the residue level of fluroxypyr-meptyl and fluroxypyr in wheat and soil samples. the results suggested that the developed method was successfully applied to the routine monitoring of fluroxypyr-meptyl or fluroxypyr residues in practical samples.