✍ Scribed by Belen Gómara; Mario Antonio Fernández; M.-José González; Lourdes Ramos
No coin nor oath required. For personal study only.
The different parameters affecting the ionisation and fragmentation of selected polychlorinated biphenyls (PCBs) in an IT detector working in the MS/MS mode, ITD(MS/MS), have been optimised for maximum selectivity and sensibility. The low LODs (in the range 0.03–0.3 μg/L), the satisfactory repeatability (RSDs in general below 11%) and reproducibility (RSDs below 17%) obtained when analysing standard solutions ensured proper determination of the PCBs studied at the concentrations typically found in food samples. Foodstuffs naturally contaminated with varying levels of PCBs have been analysed using the optimised GC–ITD(MS/MS) method. The results obtained compared favourably with those found using more conventional detectors, such as (micro‐)electron capture detection (for ortho‐PCBs) and high‐resolution MS (for non‐ortho‐PCBs), as well as with the consensus PCB levels established for these particular samples via an international interlaboratory exercise. The relative merits of these three detectors have been discussed.
📜 SIMILAR VOLUMES
Gas chromatography/tandem mass spectrometry (GC/MS/MS) using an ion-trap instrument was applied for the determination of ergosterol, muramic acid and 3-hydroxy fatty acids with 10-18 carbon atoms in samples of organic dust. These substances were used as chemical markers to measure fungal biomass, ba
## Abstract The determination of tetra‐ to octachlorodibenzo‐__p__‐dioxins and tetra‐ to octachlorodibenzofurans (PCCD/Fs) by high‐resolution gas chromatography/tandem mass spectrometry (HRGC/MS/MS) and high‐resolution gas chromatography/triple mass spectrometry (HRGC/MS^3^) in a quadrupole ion tra
## Abstract An effective multi‐residue pretreatment technique, solid‐phase extraction (SPE) combined with dispersive liquid–liquid microextraction (DLLME), was proposed for the trace analysis of 14 polychlorinated biphenyls (PCBs) and polybrominated diphenyl ethers (PBDEs) in milk samples using gas