2. Experimental
2.1. Chemicals
The 1–hydroxypyrene
phenanthrene (2–OHPH) standards used were from Dr. Ehrenstorfer GMbH, 10 ng L 1 in acetonitrile. Analytical–reagent grade dichloromethane (from Carlo Erba 99.9%), acetone, hexane, cyclohexane (from Carlo Erba 99.5%) were used to extract the organic compounds from atmospheric aerosols. For the mobile phase, HPLC–grade acetonitrile (99%), methanol (Carlo Erba 99.85%), acetic acid (from Carlo Erba 99.8%) and deionized water were used. For clean–up assays we used silica gel and 450 mg Alumina (neutral) MiniSpeed cartridges (Applied Separations).
2.2. Chromatographic apparatus
The equipment used was an Agilent Series 1200 Liquid Chromatograph equipped with an Eclipse XDB C–18 (Agilent) column (150 x 4.6 mm, 5 μm), maintained at 36.7°C with a Jones Chromatography 7971 temperature controller, a quaternary pump Agilent 1200 and a series 1100 fluorescence detector connected to a Chemstation computer system. The mobile phase was initially a mixture of acetonitrile/water (60/40) and the flow rate was 1.0 mL min–1, and the separation was performed isocratically and the injection volume was 25 μL. Fluorescence was detected at wavelengths of 259/386 nm for 2–OHPH and 242/388 nm for OH– PYR.
(1–OHPYR) and
2–hydroxy–
2. Experimental 2.1. Chemicals The 1–hydroxypyrene phenanthrene (2–OHPH) standards used were from Dr. Ehrenstorfer GMbH, 10 ng L 1 in acetonitrile. Analytical–reagent grade dichloromethane (from Carlo Erba 99.9%), acetone, hexane, cyclohexane (from Carlo Erba 99.5%) were used to extract the organic compounds from atmospheric aerosols. For the mobile phase, HPLC–grade acetonitrile (99%), methanol (Carlo Erba 99.85%), acetic acid (from Carlo Erba 99.8%) and deionized water were used. For clean–up assays we used silica gel and 450 mg Alumina (neutral) MiniSpeed cartridges (Applied Separations). 2.2. Chromatographic apparatus The equipment used was an Agilent Series 1200 Liquid Chromatograph equipped with an Eclipse XDB C–18 (Agilent) column (150 x 4.6 mm, 5 μm), maintained at 36.7°C with a Jones Chromatography 7971 temperature controller, a quaternary pump Agilent 1200 and a series 1100 fluorescence detector connected to a Chemstation computer system. The mobile phase was initially a mixture of acetonitrile/water (60/40) and the flow rate was 1.0 mL min–1, and the separation was performed isocratically and the injection volume was 25 μL. Fluorescence was detected at wavelengths of 259/386 nm for 2–OHPH and 242/388 nm for OH– PYR. (1–OHPYR) and 2–hydroxy–
การแปล กรุณารอสักครู่..