Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.14/3375
Título: Gas diffusion sequential injection system for the spectrophotometric determination of free chlorine with o-dianisidine
Autor: Mesquita, Raquel B. R.
Rangel, António O. S. S.
Palavras-chave: Sequential injection
Chlorine
Gas diffusion unit
Spectrophotometry
Waters and bleaches
Data: 2005
Editora: Elsevier
Citação: MESQUITA, Raquel B. R. ; RANGEL, António O. S. S. Gas diffusion sequential injection system for the spectrophotometric determination of free chlorine with o-dianisidine. Talanta. ISSN 0039-9140. Vol. 68, n. 2 (2005), p. 268–273
Resumo: A gas diffusion sequential injection system for spectrophotometric determination of free chlorine is described. The detection is based in the colorimetric reaction between free chlorine and a low toxicity reagent o-dianisidine. A gas diffusion unit is used to isolate free chlorine from the sample in order to avoid possible interferences. This feature results from the conversion of free chlorine to molecular chlorine (gaseous) with sample acidification. With minor changes in the operating conditions, two different dynamic ranges were obtained enhancing the application both to water samples and bleaches. The results obtained with the developed system were compared to the reference method, iodometric titration and proved not to be statistically different. A detection limit of 0.6 mg ClO−/L was achieved. Repeatability was evaluated from 10 consecutive determinations being the results better than 2%. The two dynamic ranges presented different determination rates: 15 h−1 for 0.6–4.8 mg ClO−/L (water samples) and 30 h−1 for 0.047–0.188 g ClO−/L (bleaches).
URI: http://hdl.handle.net/10400.14/3375
Versão do Editor: http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6THP-4H16NVC-2&_user=2460358&_coverDate=12%2F15%2F2005&_rdoc=20&_fmt=high&_orig=browse&_origin=browse&_zone=rslt_list_item&_srch=doc-info%28%23toc%235288%232005%23999319997%23610440%23FLA%23display%23Volume%29&_cdi=5288&_sort=d&_docanchor=&_ct=51&_acct=C000057417&_version=1&_urlVersion=0&_userid=2460358&md5=c519bd8e2974a282bb7bf56dd57a776f&searchtype=a
Aparece nas colecções:ESB - Artigos em revistas internacionais com Arbitragem / Papers in international journals with Peer-review

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