Determination of 6 kinds of organophosphorus pesticide residues in vegetables by LC-MS
To establish a method for the simultaneous determination of 6 kinds of organophosphorus pesticide residues in vegetables by LC-MS based on macro-microporous ZIF-8 as adsorbents for purification.The instrument conditions and dispersive solid-phase extraction conditions(including the amount of extraction solvent,the amount of adsorbents,and the choice of desorption solvent)that affect the recovery rate of the target pesticide were optimized.The established method was used to determine pesticide residues in 200 batches of vegetable samples sold on the market.Under the optimized conditions,6 kinds of organophosphorus pesticides showed good linearity,and the correlation coefficients were greater than 0.9995,with the limit of quantitations among 0.6～1.5μg·kg-1.The spiked recoveries were 90.8%～107.2%,and relative standard deviations were 1.2%～3.7%.This method is reliable and convenient,and can simultaneously detect 6 kinds of organophosphorus pesticide residues in vegetables.In addition,M-ZIF-8 can be easily recycled and reused at least 6 times,thereby reducing analysis costs.This method broadens the research and development of green chemistry and provides strong technical support for sustainable development.
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