Estudo da Determinação dos Grupos Silanóis ( º Si-OH) em Sílica: Aplicação à Materiais de Recheio Utilizados em Cromatografia Gasosa

A simple chemical method has been developed to quantify the silanol groups (º Si-OH) in silica as well as in coated chromatographic supports for use in packed - column Gas Chromatography. After adsorption of 10 mg/mL methylene blue, centrifuging action and filtration, the absorbance of the solution...

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Bibliographic Details
Published in:Química nova 1997-06, Vol.20 (3), p.267-269
Main Authors: Ionara Regina Pizzutti, Letícia Schwerz, Nádia Suzana Schneider Viaro, Martha Bohrer Adaime
Format: Article
Language:English
Subjects:
methylene blue
silanol group
UV-Vis spectrophotometry
Online Access:Get full text
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Summary:A simple chemical method has been developed to quantify the silanol groups (º Si-OH) in silica as well as in coated chromatographic supports for use in packed - column Gas Chromatography. After adsorption of 10 mg/mL methylene blue, centrifuging action and filtration, the absorbance of the solution was inversely proportional to the silanol quantity. The difference between the absorbance of the pure solution and that of the solid - free filtrate was related to the silica weight, yielding a quantitative analysis of these groups.
ISSN:0100-4042
1678-7064
DOI:10.1590/S0100-40421997000300007