Determination of aniline in vegetable oils by diazotization and coupling in a microemulsion medium

A microemulsion containing sodium dodecyl sulphate and n-pentanol in a mass ratio of 1 : 4, water and a vegetable oil was investigated using pseudo-tenary phase diagrams. The medium can co-solve important amounts of vegetable oils and aqueous solutions over a wide range of ionic strengths. A procedu...

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Bibliographic Details
Published in:Analytica chimica acta 1990, Vol.235 (2), p.317-322
Main Authors: Esteve Romero, J.S., Simó Alfonso, E.F., García Alvarez-Coque, M.C., Ramis Ramos, G.
Format: Article
Language:English
Subjects:
Aniline
Biological and medical sciences
Fat industries
Food industries
Fundamental and applied biological sciences. Psychology
Microemulsions
Vegetable oils
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Summary:A microemulsion containing sodium dodecyl sulphate and n-pentanol in a mass ratio of 1 : 4, water and a vegetable oil was investigated using pseudo-tenary phase diagrams. The medium can co-solve important amounts of vegetable oils and aqueous solutions over a wide range of ionic strengths. A procedure for the determination of 1.4–140 μg ml −1 of aniline in vegetable oils using ionic diazotization and coupling reactions was developed. The absorbance was measured in an optically clear microemulsion containing 4% or 20% of oil. The procedure is much simpler and rapid than the official chromatographic methods and gives almost the same limits of detection (ca. 05 μg ml −1) using no more than 1 ml of sample. The repeatability for 30 μg ml −1 aniline was 2%. Acid-base titrations in the microemulsion medium permitted the evaluation of the protonation constant of the dye.
ISSN:0003-2670
1873-4324
DOI:10.1016/S0003-2670(00)82089-9