Análise de benzeno, tolueno, etilbenzeno e xilenos em solos por headspace e cromatografia gasosa/detector de ionização de chama

Black Fungi and Hydrocarbons: An Environmental Survey for Alkylbenzene Assimilation

“…Toluene is relatively soluble and volatile, so it contributes to both water and air pollution. When inhaled, it acts as a central nervous system suppressor and may be lethal after exposure for one hour at 1800 to 2000 ppm v/v [ 3 ], and it may also cause chronic toxic effects at relatively low concentrations [ 4 , 5 ]. The American Conference of Governmental Industrial Hygienists (ACGIH) considers 20 ppm v/v as a threshold limit value (TLV) for toluene exposure to avoid occupational risks [ 6 ].…”

“…Thereby, the presence of ethanol allows the solubilization of high levels of alkylbenzenes [ 11 ], which, added to the aging and poor conservation of fuel storage tanks, results in leaks where ethanol carries gasoline alkylbenzenes to the soil aqueous phase. This enables alkylbenzenes to move through the soil matrix, increasing the probability of polluting underground water bodies and aquifers [ 4 ]. Such an environmental impact has been dubbed as BTEX pollution because of the predominance of benzene, toluene, ethylbenzene, and xylene isomers.…”

Avaliação de processos oxidativos para o tratamento ambientalmente adequado de fluidos de corte

“…depressores do sistema nervoso central, e apresentam toxicidade crônica, mesmo em pequenas concentrações (da ordem de ppb), sendo o benzeno o mais tóxico e comprovadamente carcinogênico [37]. O aparelho utilizado para as análises foi um cromatógrafo a gás da marca Shimadzu modelo GC-17A, utilizando um detector de ionização de chama (FID).…”