PROCESS FOR DETECTING AZO DYE MARKED MINERAL OILS AND AZO DYES USING FOR DETECTING MINERAL OILS

摘要

The present invention relates to a process for the detection of azo-dyed mineral oils, which comprises treating the labeled mineral oil with an extractant comprising water, a solvent and a base, characterized in that the compound of formula (Ia) or a solvent and an alkali metal or alkaline earth metal hydroxide, an alkali metal carbonate, an ammonium compound of formula (II) are used as the base. ŕ