Comparative study of nicotine titrations by the colorimetric method of the complex formed with naphthylamine and BrCN, and by the spectrophotometric method in the ultraviolet
Abstract
1. Alpha-naphthylamine lacks specificity for the colorimetric reaction of nicotine and BrCN.
2. Slight variations in the pH of the medium significantly affect the optimal formation of the colored compound, even with the use of the beta isomer.
3. This influence is even greater in the case of variations in the concentration of BrCN. The optimum concentrations of this are above the solubility limit in the solvents used for the reaction.
4. The colorimetric reaction is valid only for nicotine solutions comprised between 2 and 30, and the error of the determination is higher than the moderately permissible one.
Downloads
Downloads
Published
How to Cite
Issue
Section
License
The articles, which are published in this journal, are subject to the following terms in relation to the rights of patrimonial or exploitation:
- The authors will keep their copyright and guarantee to the journal the right of first publication of their work, which will be distributed with a Creative Commons BY-NC-SA 4.0 license that allows third parties to reuse the work whenever its author, quote the original source and do not make commercial use of it.
b. The authors may adopt other non-exclusive licensing agreements for the distribution of the published version of the work (e.g., deposit it in an institutional telematic file or publish it in a monographic volume) provided that the original source of its publication is indicated.
c. Authors are allowed and advised to disseminate their work through the Internet (e.g. in institutional repositories or on their website) before and during the submission process, which can produce interesting exchanges and increase citations of the published work. (See The effect of open access).