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The determination and identification of various phthalate esters in the environment is of a growing concern as the adverse health effects become known. Phthalates have long been added to polymers to increase their flexibility. The adverse health effects of plastics containing phthalates has prompted the European Union (EU) to ban at least six diffe...
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Summary
This report is part of the analyses in the Natura and Ammonia project initiated by the Environmental Protection Agency under the Ministry of Food and Agriculture. The purpose of the overall project is to look at the regulation with respect to ammonia emissions from livestock farms near Natura 2000 sites in Germany, The Netherlands and Denma...
Polycyclic aromatic hydrocarbons (PAHs) are a ubiquitous class of environmental micropollutants produced by combustion processes. They are commonly produced in urban areas by vehicles and from road dust. The United States Environmental Protection Agency (EPA) has included 16 PAHs (PAH16) on their list of Priority Pollutants. During the winter in no...
Resumen El presente trabajo tiene el propósito de contribuir a mejorar el conocimiento de la calidad del aire en la ciudad de Loja a través del análisis de la emisión de dióxido de carbono (CO2) de los vehículos automotores, para lo cual se caracterizó al parque automotor mediante encuestas, aforo vehicular y recopilación de información en entidade...
Citations
... With MS detection, PAEs can be ionized by electron impact (EI) or chemical ionization (CI) using methane, isobutane or ammonium as the reagent gas in either positive or negative mode. 3,5,7 With EI, the most abundant ion for most phthalates is the protonated phthalic anhydride ion at m/z 149, except for dimethyl phthalate (DMP, m/z 163), Fig. 5. Indeed, these signals may suffer the presence of coeluted isomers (as the above mentioned case of DNP and DDP isomers) or matrix interferences. So, selective determination is only possible by monitoring MS signals of low relative intensity. ...
... However, the degree of fragmentation depends on the reagent gas selection. 3,7 When using methane as reagent gas, significant fragmentation is also observed and the fragment at m/z 149 is still one of the most abundant ions. The use of isobutane or ammonium as reagent gas affords mild ionization conditions yield stable [M þ H] þ ions (Fig. 6). ...
