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|Type:||Artigo de periódico|
|Title:||Fast detection of hydrogen sulfide using a biodegradable colorimetric indicator system|
|Abstract:||A fast, colorimetric indicator system was developed by combining chitosan as a three-dimensional biopolymer matrix and ferrous sulfate (FeSO(4)) as a colorimetric indicator of hydrogen sulfide (H(2)S) gas. Chitosan filmogenic suspensions (3.0% w/w) were obtained and FeSO4 was incorporated at 2.0 wt%. The colour parameters were measured using a colorimeter, after subjecting the system to various H(2)S exposure times. The novelty of this work is the biodegradability, a test performed in soil, which showed a weight loss of about 67% after 60 days, and the fast device formation indicating the presence of H(2)S gas. The chitosan-FeSO(4) system detected the presence of H(2)S in concentrations equal to or greater than 100 ppm within 30s of exposure and produced a visual black colour as a response to the presence of H(2)S. (C) 2011 Society of Chemical Industry|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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