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Master's Dissertation
DOI
10.11606/D.46.2018.tde-10092018-151127
Document
Author
Full name
Joao Carlos Alves
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 1986
Supervisor
Committee
Lichtig, Jaim (President)
Franco, Douglas Wagner
Massaro, Sergio
Title in Portuguese
Determinação de íons fluoreto em águas, por titulação condutométrica com nitrato de Lantânio (III)
Keywords in Portuguese
Condutometria
Fluoreto
Química Ambiental
Abstract in Portuguese
Fluoreto presente em águas de abastecimento, pode ser determinado por titulação condutométrica, usando-se La(NO3)3 como titulante. O método proposto no presente trabalho exige a separação prévia de fluoreto da amostra, por destilação a 135ºC. O pH do destilado é ajustado entre 5,5 - 6,0; etanol é adicionado até atingir-se a proporção de 50%, titulando-se a solução resultante com La(NO3)3. Nessas soluções, fluoreto nas concentrações de 500 ppb e 2,0 ppm podem ser determinadas com precisões de 5% e 4%, respectivamente. Amostras naturais foram analisadas condutometricamente pelo método proposto, potenciometricamente com eletrodo íon seletivo de fluoreto, obtendo-se resultados compatíveis.
Title in English
Determination of fluoride ions in water by conductometric titration in Lanthanum nitrate (III)
Keywords in English
Condutometry
Environmental Chemistry
Fluoride
Abstract in English
Fluoride ions in drinking water can be easily determined by condutometric titraction using La(NO3)3 as titrant. The sample must be destilled in H2S04 previously to separate the fluoride ions, at 1350 C. The destillated, in 50% ethanol is titrated with La(NO3)3 In these conditions, fluoride ions at the concentrations of 500 ppb and 2,0 ppm are determined with accuracy of, respectively, 5% and 4%. Natural samples of drinking water were analysed by this method and by the ion-selective method, with agreement among the results.
 
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Publishing Date
2018-09-10
 
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