Direct Analysis of ppb Carbendazim in Orange Juice using the Flowing Atmospheric-Pressure Afterglow (FAPA) Ambient Mass Spectrometry Source

摘要

1. Visualization of flow patterns with schlieren imaging was utilized successfully to optimize sample placement relative to the FAPA source and MS inlet; 2. Planar surfaces are required to be positioned flush with the inlet orifice; 3. Capillary supports cause turbulence and perturb the gas flow; highest signal intensity results at the edge of the cap illary support; 4. Mesh sample supports require positioning < 1mm relative to the MS inlet for maximum sensitivity; 5. FAPA-MS/MS enabled detection of ppb levels of carbendazim on orange peel or in orange juice rapidly and with minimal sample preparation; 6. The LOD of 1 ppb and LOQ of 10 ppb were demonstrated and below the prescribed 17 ppb limit indicated as unacceptable by regulatory agencies.