title: Application of headspace single-drop microextraction coupled with gas chromatography for the determination of short-chain fatty acids in RuO4 oxidation products of asphaltenes.
abstract: In this study, headspace single-drop microextraction (HS-SDME) coupled with gas chromatography-flame ionization detection (GC-FID), was employed to determine short-chain fatty acids (SCFAs) in ruthenium tetroxide (RuO(4)) oxidation products of asphaltenes. Several significant parameters, such as drop solvent type, drop volume, sample solution ionic strength, agitation speed, extraction time, and ratio of headspace volume to sample volume were optimized. Under optimum extraction conditions (i.e., a 3-microL drop of 1-butanol, 20 min exposure to the headspace of a 6 mL aqueous sample placed in a 10 mL vial, stirring at 1000 rpm at room temperature, and 30% (w/v) NaCl content), the reproducibility and accuracy of the method have been tested and found to be satisfactory. The analysis of a real asphaltene sample using this method proved that HS-SDME can be a promising tool for the determination of volatile SCFAs in complex matrices.
authors.affiliation: State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China.
authors.forename: Yun
authors.initials: Y
authors.lastname: Li
authors.forename: Yongqiang
authors.initials: Y
authors.lastname: Xiong
authors.forename: Qianyong
authors.initials: Q
authors.lastname: Liang
authors.forename: Chenchen
authors.initials: C
authors.lastname: Fang
authors.forename: Chunjiang
authors.initials: C
authors.lastname: Wang
mesh_terms: D005591:Chemical Fractionation / Q000379:methods*; D002849:Chromatography, Gas / Q000379:methods*; D005232:Fatty Acids, Volatile / Q000032:analysis* / Q000737:chemistry; D016014:Linear Models; D010084:Oxidation-Reduction; D010578:Petroleum / Q000032:analysis*; D015203:Reproducibility of Results; D017975:Ruthenium Compounds / Q000737:chemistry*
chemical_list: D005232:Fatty Acids, Volatile; D010578:Petroleum; D017975:Ruthenium Compounds; C027646:ruthenium tetraoxide