Suchergebnisse

The use of the novel atmospheric pressure chemical ionization (APCI) source for gas chromatography (GC) coupled to triple quadrupole using tandem mass spectrometry (MS/MS) and its potential for the simultaneous determination of the 12 dioxin-like polychlorobiphenyls (DL-PCBs) in complex food and feed matrices has been evaluated. In first place, ionization and fragmentation behavior of DL-PCBs on the APCI source under charge transfer conditions has been studied followed by their fragmentation in the collision cell. Linearity, repeatability and sensitivity have been studied obtaining instrumental limits of detection and quantification of 0.0025 and 0.005 pg µL-1 (2.5 and 5 fg on column) respectively for every DL-PCB. Finally, application to real samples has been carried out and DL-PCB congeners (PCB 77, 81, 105, 114, 118, 123, 126, 156, 157, 167, 169, 189) have been detected in the different samples in the range of 0.40 to 10000 pg g-1. GC-(APCI)MS/MS has been proved as a suitable alternative to the traditionally accepted confirmation method based on the use of high resolution mass spectrometry and other triple quadrupole tandem mass spectrometry techniques operating with electron ionization. The development of MS/MS methodologies for the analysis of dioxins and DL-PCBs is nowadays particularly important, since this technique was included as a confirmatory method in the present European Union regulations that establish the requirements for the determination of these compounds in food and feed matrices. ; The authors acknowledge the financial support of Generalitat Valenciana, (research group of excellence PROMETEO/2009/054 and PROMETEO II 2014/023 and Collaborative Research on Environment and Food-Safety (ISIC/2012/016))

Resumen de la comunicación presentada en PIC2015 – the 14th International Congress on Combustion By-Products and Their Health Effects, Umeå, Sweden, 14-17 June 2015. ; The aim of the present study was to assess the emission of di2erent persistent organic pollutants from a cement plant over a period of one year, under normal operating conditions. In this way, a Dioxin Monitoring System (a long-term sampling device manufactured by Monitoring Systems) was installed in the clinker kiln stack of the cement plant, located in the vicinity of the University of Alicante. The factory has a production capacity of 150 t/h of clinker and uses petroleum coke as primary fuel, but also alternative fuels such as SRF (solid recovered fuel), ASR (automotive shredder residue), sewage sludge, waste tires, and meat and bone meal wastes, with an enerKy substitution level of about 40 %. The study consisted of a total of 13 samples, namely: • Ten samples collected in 3Q4 week periods, for the determination of brominated dioxins and furans (PBDD/Fs). • Three samples collected during one-week periods, for the determination of polycyclic aromatic hydrocarbons (PAHs). ; Support for this work was provided by the following projects: • Ministry of Science and Innovation (Spain): CTQ2011Q23618. • Ministry of Economy and Competitiveness (Spain): CTQ2013Q41006QR. • Valencian Community Government (Spain): PROMETEOII/2014/007.

Fish samples of different species (i.e. rainbow trout (Onchorhynchus mykiss), barbel (Barbus barbus) and European chub (Squalius cephalus)) were collected from the Sava River Basin for a preliminary investigation of the levels of PCDD/Fs, PCBs, PBDEs and PFAS as a whole. Concentrations of PCDD/Fs, in terms of pg WHO-TEQ/g ww, were below the maximum limit established at the Commission Regulation (EU) No 1259/2011. On the contrary, when DL-PCBs were also included, levels increase up to 11.7 pg WHO-TEQPCDD/Fs+DL-PCBs/g ww in a particular case, with two samples out of a total of ten exceeding the maximum set at this EU Regulation and the EQS established at the European Directive regarding priority substances in the field of water policy (0.0065 ng WHO-TEQPCDD/Fs+DL-PCBs/g ww). A similar trend was also observed for NDL-PCBs, whit the same two samples, from the lower stretch of the river basin, exceeding the maximum limit allowed at the EU Regulation (125 ng/g ww). For PBDEs, levels found in all the samples exceeded the EQS (0.0085 ng/g ww) up to more than a thousand times and 40% of the samples presented PFOS values above the EQS. Data from this study were compared to values reported at the literature for fish from other geographical areas. © 2018 ; The research leading to these results has received funding from the European Communities 7th Framework Programme under Grant Agreement No. 603629-ENV-2013-6.2.1-GLOBAQUA and Grant Agreement No. 603437-ENV-2013-SOLUTIONS projects. This work was also funded by the Generalitat de Catalunya (Consolidated Research Groups 2017 SGR 1404 - Water and Soil Quality Unit). M. Llorca wants to acknowledge her Juan de la Cierva – Incorporación research fellowship (JdC-2014-21736) from the Spanish Ministry of Economy and Competitiveness. J. Parera is also grateful to the Spanish Ministry of Economy and Competitiveness for a Juan de la Cierva – Formación research fellowship (FJCI-2015-26722). Appendix A ; Peer reviewed