Journal Article10.1039/C3AY41742E
Simultaneous determination of fipronil and its major metabolites in corn and soil by ultra-performance liquid chromatography-tandem mass spectrometry
Youpu Cheng,Youpu Cheng,Fengshou Dong,Xingang Liu,Jun Xu,Wei Meng,Na Liu,Zenglong Chen,Yan Tao,Yongquan Zheng +9 more
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TL;DR: In this article, a simple, quick, effective method was developed for the determination of fipronil and its three metabolites in soil and corn by ultra-performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS).
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Abstract: A simple, quick, effective method was developed for the determination of fipronil and its three metabolites in soil and corn by ultra-performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS). Samples were extracted with acetonitrile and cleaned-up with C18, C18/PSA, PSA/GCB for soil, corn grain, and corn straw, respectively. The optimization of MS/MS parameters was performed in multi-reaction monitoring (MRM) mode, and electrospray ionization (ESI) in the negative mode was selected. The mean recoveries of the four compounds in soil, corn grain, and corn straw matrices at four fortification levels were in the range of 82.4% to 104.6%; the intra-day and inter-day RSDs ranged from 1.2% to 7.7% and 2.4% to 9.4%, respectively. The LODs of fipronil and its three metabolites in soil, corn grain, and corn straw matrices were estimated to be 0.5–2.5 μg kg−1, the LOQs were 5 μg kg−1 for soil and corn grain, and 10 μg kg−1 for corn straw. The developed method was also applied to the study of fipronil dissipation in soil and corn. The results further confirmed the reliability and efficacy of the proposed method for routine pesticide residue monitoring in soil and corn samples.
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Citations
Quenched electrochemiluminescence sensor of ZnO@g-C3N4 modified glassy carbon electrode for fipronil determination
TL;DR: In this paper, a quenched electrochemiluminscence (ECL) sensor was constructed based on the integration of ZnO and g-C3N4 for determination of fipronil.
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Determination of residual fipronil in chicken egg and muscle by LC-MS/MS.
TL;DR: A simple, sensitive and reliable method was developed and applied to the residue analysis of fipronil in chicken egg and muscle by liquid chromatography-tandem mass spectrometry (LC-MS/MS), which has also been successfully applied to monitoring fipronsil in the real samples.
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Concentrations and dissipation of difenoconazole and fluxapyroxad residues in apples and soil, determined by ultrahigh-performance liquid chromatography electrospray ionization tandem mass spectrometry.
TL;DR: The difenoconazole and fluxapyroxad residue concentrations in apples were lower than the maximum residue limits (0.5 and 0.8 mg kg−1, respectively) and it is recommended that treated apples can be considered safe for humans to consume.
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Concentration and dissipation of chlorantraniliprole and thiamethoxam residues in maize straw, maize, and soil
TL;DR: The final pesticide residues on maize were lower than the maximum residue limit (MRL) of 0.02 mg kg−1 after a 14-day pre-harvest interval, and a dosage of 72 g a.i. ha−1 was recommended, as it can be considered safe to human beings and animals.
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A natural deep eutectic solvent as a novel dispersive solvent in dispersive liquid-liquid microextraction based on solidification of floating organic droplet for the determination of pesticide residues
Laura Carbonell-Rozas,Romina Canales,Francisco Lara,Ana M. García-Campaña,María Fernanda Silva +4 more
TL;DR: In this article, a new extraction method employs dispersive liquid-liquid microextraction based on a solid floating organic droplet (DLLME-SFO), by using a mixture composed of a less dense than water extraction solvent, 1-dodecanol, and a novel dispersive solvent, NADES.
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