Determinação de clorobenzenos em água por cromatografia de fase gasosa com headspace

• Autor(a) principal: Tavares, Margarida Maria Sartori
• Data de Publicação: 2012
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da UERJ
• Texto Completo: http://www.bdtd.uerj.br/handle/1/15743
• topic: underground water; water; headspace; chlorobenzenes; (GC-HS) and VOC; água subterrânea; água; headspace; clorobenzenos; (CG-HS) e COV; CNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICA::QUIMICA ANALITICA

The concerns with the environment, in particular with water, acquire special importance, because the demands become ever higher, under the growth of the population and industrial activities aspects. When speaking about underground water, the first notion that comes to mind is that it is potable water. But that s not always a true. In urban areas, the increasing numbers of problems due to contamination, is caused, most of time, by leaking gas tanks of gas stations. Not to mention industries that also offer the potential risk of contamination of these water bodies and that less divulged. The present work is focused in determining chlorobenzenes by headspace gas chromatography (HS-GC) in the water and validating its methodology. The methodology used in this work was headspace gas chromatography (HS-CG), because of its excellence technique and sensitive, applied for determining low concentrations volatile compounds. The data was statistically treated so to evaluate the selectivity, quantitation and detection limits, work range linearity, linearity and recovery. The recoveries vary between 80 to 110%, the variation obtained were less than 20%, all compounds present linearity in the work range 0,8 of 100µg.L-1. . Ten samples of underground water of Rio de Janeiro were tested, and all the samples contained the studied compounds, as and range concentration: chlorobenzene (<0,8 a 2,988µg.L-1), 1,3-dichlorobenzene (<0,8 a 23,067µg.L-1), 1,4-dichlorobenzene (nd a 16,160µg.L-1), 1,2-dichlorobenzene (<0,8 a 48,685µg.L-1), 1,3,5-trichlorobenzene (<0,8 a 21,900µg.L-1), 1,2,4-trichlorobenzene (1,007 a 183,808µg.L-1) and 1,2,3-trichlorobenzene (<0,8 a 126,886µg.L-1)