Method for detecting a marker dye in aged petroleum distillate f

Details Method for detecting a marker dye in aged petroleum distillate f Method for detecting a marker dye in aged petroleum distillate f

1993-01-22

1994-04-19

Housel, James C.

Chemistry: analytical and immunological testing

Tracers or tags

436 60, 436178, 44312, G01N 3508

Patent

active

053044932

ABSTRACT:
Aged and/or colored diesel fuels and similar petroleum distillates may be analyzed for the presence of an anthraquinone marker dye such as DuPont Chemicals Oil Blue B Liquid dye by passing a sample of the fuel through an unbonded silica solid phase extraction column which retains the color-forming agents on the column and which will provide for visual detection of the substantially nonretained marker dye in the column. A sufficiently nonpolar elution solvent such as dichloromethane or toluene may be passed through the column to elute the marker dye without removing the color-forming agents from the column. The solvent may be spectrophotometrically analyzed to detect presence of the dye.

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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