title: Directly suspended droplet microextraction in a rotating vial.
abstract: In this paper, a novel suspended droplet microextraction method was developed for the detection of trace of organic compounds in water samples. The process was executed in a rotating extraction vial without the use of a stir bar. A single drop of octan-1-ol placed on top of the water sample was used as the solvent. The droplet remained on top of the water sample as a thin layer with an expanding surface area during the extraction stage, while during the sampling stage, the droplet was collected and sampled by inserting a needle. The volume of the microdroplet used was 3 microL or less, to ensure high organic compound sensitivity. The microextraction experimental setup was simple, utilizing centrifugal forces and possesses the advantages of low cross-contaminant/interference and applicability to water samples apt to emulsification. Nitrobenzene was selected as a model organic compound, and samples were analyzed using gas chromatography (GC) or UV-vis spectrometry. Analysis of the microextraction method results showed a relative standard deviation (RSD) less than 3.82%.
authors.affiliation: State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China.
authors.forename: Gao
authors.initials: G
authors.lastname: Mingyuan
authors.forename: Lu
authors.initials: L
authors.lastname: Yangcheng
authors.forename: Luo
authors.initials: L
authors.lastname: Guangsheng
mesh_terms: D005591:Chemical Fractionation; D002849:Chromatography, Gas / Q000379:methods*; D000442:Octanols / Q000737:chemistry; D009930:Organic Chemicals / Q000032:analysis* / Q000302:isolation & purification; D012399:Rotation; D013056:Spectrophotometry, Ultraviolet / Q000379:methods*; D014867:Water / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000302:isolation & purification
chemical_list: D000442:Octanols; D009930:Organic Chemicals; D014874:Water Pollutants, Chemical; D014867:Water