LAUSR

The magnetic metal-organic framework MIL-101(Cr) material-based solid phase extraction method coupled with high performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS) was applied to extract seven triazine herbicides in rices. Fe3 O4 /MIL-101(Cr) was synthesized using reduction-precipitation method, in which steps including pre-synthesis and modification of Fe3 O4 nanoparticles were by-passed. Various parameters including extraction solvent type and volume, ultrasonic extraction time, amount of Fe3 O4 /MIL-101(Cr) microspheres, adsorption time, desorption volume and time were investigated. Under optimal conditions, the proposed method had the limit of detection (S/N = 3) and the limit of quantification (S/N = 10) of 1.08 - 18.10 and 3.60 - 60.20 pg g-1 , respectively. Relative standard deviations calculated for all herbicides with concentrations of 2.00 and 20.00 ng g-1 were in the range of 0.5 to 13.0% (n = 3). In addition, at the two above-mentioned concentrations, the method achieved relative recoveries percentages of 79.3 to 116.7% when applied to determine the triazine herbicides in real samples spiked. This rapid, green, non-polluting, pre-concentrated extraction method was successfully developed and applied to analyze herbicides in rice samples. This article is protected by copyright. All rights reserved.