HPLC-MS/MS Determination of Residual Amount of Ethofumesate in Vegetative Food with Graphitized MWNTs Composite Purification

YANG Fei; FANG Zhisan; LIU Jun; SU Youzhi

doi:10.11973/lhjy-hx202010002

YANG Fei, FANG Zhisan, LIU Jun, SU Youzhi. HPLC-MS/MS Determination of Residual Amount of Ethofumesate in Vegetative Food with Graphitized MWNTs Composite Purification[J]. PHYSICAL TESTING AND CHEMICAL ANALYSIS PART B:CHEMICAL ANALYSIS, 2020, 56(10): 1052-1058. DOI: 10.11973/lhjy-hx202010002

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HPLC-MS/MS Determination of Residual Amount of Ethofumesate in Vegetative Food with Graphitized MWNTs Composite Purification

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The vegetative food sample was extracted with hexane and 50% (φ) acetonitrile solution respectively. After composite purification by 3 adsorbents (graphitized MWNTs, SAX and PSA), the supernatant was taken and filtered. HPLC-MS/MS was applied to the determination of residual amount of ethofumesate in the filtrate. JADE-PAK CB-C₁₈ chromatographic column was used as stationary phase, and the mixture of 0.1% (φ) formic acid solution and acetonitrile mixed in different ratios was used as mobile phase in gradient elution. ESI⁺ and multi-reactions monitor mode were adopted in MS/MS. Linearity ranges of ethofumesate in various matrices were all found between 20 μg·L^-1 and 100 μg·L^-1, with detection limits (3S/N) of 6.0 μg·kg^-1 and lower limits of determination (10S/N) of 20.0 μg·kg^-1. On the base of blank sample, test for recovery was made by standard addition method; values of recovery found were in the range of 74.1%-121%, with RSDs (n=6) of determined values in the range of 2.8%-16%.
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HPLC-MS/MS Determination of Residual Amount of Ethofumesate in Vegetative Food with Graphitized MWNTs Composite Purification

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