RESUMO
The chemicals warfare agents (CWAs) are an extremely toxic class of molecules widely produced in many industrialized countries for decades, these compounds frequently contained arsenic. The plants where the CWAs have been produced or the plants where they have been demilitarized after the Second World War with unacceptable techniques can represent a serious environmental problem. CWAs standards are difficult to find on market so in present work an environmental assessment method based on markers has been proposed. Triphenylarsine, phenylarsine oxide and thiodiglycol have been selected as markers. Three reliable analytical methods based on gaschromatography and mass detection have been proposed and tested for quantitative analysis of markers. Methods performance have been evaluated testing uncertainty, linearity, recovery and detection limits and also comparing detection limits with exposure limits of reference CWAs. Proposed assessment methods have been applied to a case study of a former industrial plant sited in an area characterized by a high background of mineral arsenic.
Assuntos
Arsenicais/análise , Substâncias para a Guerra Química/análise , Gás de Mostarda/análise , Solo/química , Compostos de Sulfidrila/análise , Biomarcadores/análise , Cromatografia Gasosa , Limite de DetecçãoRESUMO
Selected polychlorinated dibenzo-p-dioxins (PCDDs) and dibenzofurans (PCDFs) were detected by gas-chromatography coupled to triple quadrupole mass spectrometry (GC-QqQ-MS/MS) in marine sediments collected in central Italy. Total PCDD/Fs concentrations ranged from 11.58 to 193.29 pg/g d.w., with PCDFs as the major contributors in most cases. The congener profiles were characterized by high OCDD (70.7%-91.4%). The PCDD/Fs values are within or close to the Environmental Canada sediment reference values (0.85 pg TEQ/g d.w.). GC-QqQ-MS/MS can be a suitable alternative to standard methods for PCDD/Fs determination in environmental samples. The measured PCDD/Fs amounts could be considered as a basis for future monitoring programs.
Assuntos
Benzofuranos/análise , Monitoramento Ambiental/métodos , Sedimentos Geológicos/química , Dibenzodioxinas Policloradas/análogos & derivados , Poluentes Químicos da Água/análise , Dibenzofuranos Policlorados , Cromatografia Gasosa-Espectrometria de Massas/métodos , Itália , Dibenzodioxinas Policloradas/análiseRESUMO
The ability of transplanted lichen Pseudevernia furfuracea to biomonitor specific airborne pollutants (heavy metals and polycyclic aromatic hydrocarbonsPAHs) was investigated at five stations with different traffic densities in Viterbo, Italy. Exposed lichen showed high levels of all analysed pollutants; greatest values were for Zn (147252 µg/g dw), Pb (24.934.6 µg/g dw), fluoranthene (37107 ng/g dw), pyrene (23124 ng/g dw). Comparison between contaminants concentration in lichens before and after exposure showed "accumulation" or "severe accumulation" rates in more than 90% of each substance. Besides, Pseudevernia furfuracea accumulated airborne PAHs in a manner that was proportional to traffic density.