Aromatic Sulfur Compounds Enrichment from Seawater in Crude Oil Contamination by Solid Phase Extraction

P.      Avino; I.      Notardonato; G.      Cinelli; M.   V.   Russo

Abstract

Gas chromatographic analysis of Aromatic Sulfur Compounds in distilled water and seawater samples has been performed after adsorption from 100 mL water sample onto a cartridge containing a mixture of 50 mg NH2- and 50 mg C18-bonded porous silica. The Aromatic Sulfur Compounds are desorbed with a mixture of acetone-trichloromethane (1:1), which is concentrated and analysed by gas-chromatography coupled to flame ionization or mass spectrometry detectors. The average recoveries of 80 ng mL-1 of each Aromatic Sulfur Compound from distilled water and 5.0-160 ng mL-1 from seawater samples are 93.5% with a standard deviation 2.7. The limits of detection are 0.1 and 0.08 μg mL-1 for thiophene-2-carboxaldehyde and benzothiophene, respectively, and 0.07 and 0.06 μg mL-1 for dibenzothiophene and thiantrene, respectively, in GC-FID with a relative standard deviation 8.2, whereas they are 0.08 and 0.06 μg mL-1 for thiophene-2-carboxaldehyde and benzothiophene, respectively, and 0.05 and 0.04 μg mL-1 for dibenzothiophene and thiantrene, respectively, in selected ions monitoring (SIM) with a relative standard deviation 7.8.

Keywords: Adsorbent, Aromatic sulfur compounds, Crude oil, Seawater pollution, GC-MS

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