Liquid purification or separation – Processes – Chromatography
Reexamination Certificate
2005-02-17
2009-12-08
Therkorn, Ernest G (Department: 1797)
Liquid purification or separation
Processes
Chromatography
C210S198200
Reexamination Certificate
active
07628922
ABSTRACT:
The present invention provides a preanalysis treatment method for nitropolycyclic aromatic hydrocarbons present in diesel engine exhaust particulates and the like. The method comprises feeding a test solution160in which a sample containing polycyclic aromatic hydrocarbons is dissolved in a solvent to a silica gel column170using an eluent lowest in polarity among a plurality of eluents110, 120and130to be a mobile phase for the test solution unlike the solvent and to differ in polarity from each other; and then allowing polar solvents to flow in ascending order of polarity to fractionate nitropolycyclic aromatic hydrocarbons and polycyclic aromatic hydrocarbons other than the nitropolycyclic aromatic hydrocarbons.
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Antonelli, Terry Stout & Kraus, LLP.
Isuzu Motors Limited
Therkorn Ernest G
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