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Doctoral Thesis
DOI
10.11606/T.46.2018.tde-22022018-111814
Document
Author
Full name
Margareth Mie Nakamura Matsuda
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2003
Supervisor
Committee
Coichev, Nina (President)
Fatibello Filho, Orlando
Isolani, Paulo Celso
Rossi, Adriana Vitorino
Suarez-Iha, Maria Encarnacion Vazquez
Title in Portuguese
Estudos da influência de surfactantes e determinação de cloro em água potável empregando-se TCPO e 2-NPO
Keywords in Portuguese
Cloro
Método ótico
Química analítica
Quimiluminescência
Surfactantes (Estudo)
TCPO
Abstract in Portuguese
As reações quimiluminescentes de oxalato de bis(2,4,6-triclorofenila) (TCPO) e oxalato de bis(2-nitrofenila) (2-NPO), com f1uoranteno como f1uoróforo, em sistemas micelares aquosos, foram estudadas na presença de alguns surfactantes. A oxidação destes oxalatos por peróxido de hidrogênio ou por hidroperóxido de t - butila produz quimiluminescência cuja intensidade depende da acidez e da presença de imidazol. A intensidade de quimiluminescência é maior na presença de alguns surfactantes, especialmente CTAC, OTAC, DDAB, DODAC e β-ciclodextrina. A reação de TCPO com cloro (HCIO, CIO- e Cl2) na presença de 9,10-difenilantraceno como fluoróforo, em meio de acetonitrila/água, também foi investigada. Um sistema de análise por injeção em fluxo para determinação de cloro com aplicação analítica em água de torneira foi desenvolvido. A faixa linear para a curva analítica de cloro e o limite de detecção foram, respectivamente: (0,2 - 3,0)x10-5 e 0,2 x10-5 mol L-1.
Title in English
Studies of the influence of surfactants and determination of chlorine in drinking water using TCPO and 2-NPO
Keywords in English
Analytical chemistry
Chemiluminescence
Chlorine
Optical method
Surfactants (Study)
TCPO
Abstract in English
The chemiluminescent reactions of bis (2,4,6-trichlorophenyl) oxalate (TCPO) and bis(2-nitrophenyl) oxalate (2-NPO), with fluoranthene as fluorophore, in aqueous micellar systems, were studied in the presence of surfactants. The oxidation of these oxalates by hydrogen peroxide or t-butyl peroxide produces chemiluminescence, which depends on the acidity and imidazole presence. The chemiluminescent intensity is higher in the presence of some surfactants, especially CTAC, OTAC, DDAB, DODAC and β-cyclodextrine. The reaction of TCPO with free chlorine (HCIO, CIO- and Cl2), in the presence of 9,10-diphenylanthracene as fluorophore in acetonitrile/water medium, was also investigated. A flow injection analysis system, for free chlorine determination with analytical application in tap water was developed. The linear range for free chlorine and detection limit were, respectively: (0.2-3.0)x10-5 and 0.2x10-5 mol L-1.
 
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Publishing Date
2018-02-22
 
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