Resume

The present work presents an overview about analytical method employed for detection and quantification of dyes markers of fuels. Spectrophotometric and chromatographic methods have been employed for marker dyes determination in matrices as petroleum derivates, ethanol and biodiesel. The High-performance liquid chromatography (HPLC) technique coupled with espectrophotometry, diode array and mass spectroscopy detectors have been more efficiently employed for this purpose. Additionally, the major problems associated with the detection of these dyes are the matrices that have diversity of organic and inorganic compounds that potentially interfere in their analyses. ഀ The electroanalytical methods have being investigated as successful alternative to analysis of these dyes in complex matrices as fuel. The development of electrochemical sensors has contribute to propose miniaturized devices able to detect dye markers by using methodology of modest cost, portability, simplicity of operation, reliability, and the small instrument footprint of the arrangement containing the working electrode, auxiliary and reference electrodes, which are printed directed onto a polymeric/plastic foil. ഀ Recently, we have shown that the use of electroanalytical method and versatile electrochemical sensor to quantify quinizarin (QNZ) and Solvent Blue 14 (SB-14) in fuel samples. The methodology allowed to detect these dyes on glassy carbon electrode and screen-printed carbon electrodes in satisfactory concentration level. This sensors has being successful applied as detector coupled to HPLC leading to low detection and easily pre treatment of the sample. The electrochemical detection system can be recommended for the quantitative determination of dyes in fuels when low-level detection and interference separations are required. Based on the proposed, quantitative methods has being developed to detect dyes in a gasoline and ethanol samples. The analytical method consists of the use of HPLC technique coupled with electrochemical detection for the quantification of the dye-compounds in fuel sample after a simple and fast pretreatment protocol. A suitable method of analysis of some fuel dyes in a simple and rapid procedure are described and the detection and quantification is compatible with level required to combat the adulteration and fraudulent sale of various types of petroleum-based fuels.ഀ ഀ