Detection of marker dye in aged or dirty motor gasolines

Details Detection of marker dye in aged or dirty motor gasolines Detection of marker dye in aged or dirty motor gasolines

1993-01-22

1993-09-14

Housel, James C.

Chemistry: analytical and immunological testing

Tracers or tags

436 60, 436178, G01N 3508

Patent

active

052448088

ABSTRACT:
Marker dyes are detected in aged and dirty or "brown" gasolines by passing a sample of gasoline through plural solid phase extraction columns including a first column having a strong anion exchange phase bonded to a silica substrate. A color-forming reagent is added to the first column after elution of the gasoline sample therethrough. The marker dye colored complex and colored bodies not retained on the first column are eluted into a nonpolar solid phase extraction column with methane-sulfonic acid and the marker dye colored complex is eluted through the second column and into and through a third column containing unbonded silica. The color bodies of the gasoline will remain on the columns and the marker dye will be detectable at the bottom of the third column as evidenced by a pink color for marker dyes such as Morton International Mortrace MP marker dye and the like.

REFERENCES:
patent: 3976572 (1976-08-01), Reick
patent: 4049393 (1977-09-01), Orelup
patent: 4209302 (1980-06-01), Orelup
patent: 4514503 (1985-04-01), Orelup
patent: 4717671 (1988-01-01), Melpolder
patent: 4918020 (1990-04-01), Nowak

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