Authors: J. Gasparič; V. Hojný; V. Kubíček Authors‘ workplace: Katedra biofyziky a fyzikální chemie farmaceutické fakulty Univerzity Karlovy, Hradec Králové Published in: Čes. slov. Farm., 1999; , 183-185 Category:
The application of acid hydroxy or amino azo dyes containng sulfo or carboxy groups as reagents forthe determination of tetra-n-butylammonium bromide as the model compound was compared. Thesulfonated dyes are applicable within a broad range of pH 2–10 with the exception of amino azodyes, the protonated form of which, formed at pH < 3, is precipitated from the solution. Theapplication of carboxy azo dyes, owing to their high pKA values, is strongly limited to very high pHvalues. Methyl red is an exception, its pKA value is in the range of 4.88–5.06.
Key words: extraction spectrophotometry – methyl red – sulfo azo dyes – carboxy azo dyes –tetra-n-butylammonium bromide
Don‘t have an account? Create new account
Enter the email address that you registered with. We will send you instructions on how to set a new password.
