Analysis of regulatory dye in diesel petroleum

This study is concerned with alternative analytical methods for determining the content of red dye in diesel fuel. It was found that a preconcentratio n step consisting of adsorption chromatography on silica gel, followed by e ither HPLC or gas chromatography-mass spectrometry greatly increases the se nsitivity of the method employed. Structures for the main components in the commercial dye are proposed based on NMR data. (C) 2000 Elsevier Science L td. All rights reserved.