Headspace Solid Phase Microextraction. Dynamics and Quantitative Analysis before Reaching a Partition Equilibrium

1997 ◽  
Vol 69 (16) ◽  
pp. 3260-3266 ◽  
Author(s):  
Jiu Ai
Keyword(s):  
Quantitative Analysis ◽  
Solid Phase Microextraction ◽  
Solid Phase ◽  
Headspace Solid Phase Microextraction ◽  
Partition Equilibrium

scholarly journals Headspace solid phase microextraction in the analysis of pesticide residues: Kinetics and quantification prior to the attainment of partition equilibrium

2007 ◽  
Vol 72 (8-9) ◽  
pp. 879-887 ◽  
Author(s):  
Rada Djurovic ◽  
Mirjana Markovic ◽  
Dragan Markovic
Keyword(s):  
Gas Phase ◽  
Pesticide Residues ◽  
Solid Phase Microextraction ◽  
Solid Phase ◽  
Polymer Interfaces ◽  
Sorption Equilibrium ◽  
New Approach ◽  
Headspace Solid Phase Microextraction ◽  
Proportional Relationship ◽  
Partition Equilibrium

A new theoretical approach to the headspace/solid phase microextraction (HS/SPME) process is proposed and tested by the analysis of pesticide residues of water samples. The new approach focuses on mass transfer at the sample/gas phase and gas phase/SPME polymer interfaces. The presented model provides a directly proportional relationship between the amount of analytes sorbed by the SPME fiber and their initial concentrations in the sample. Also, the expression indicates that quantification is possible before partition equilibrium is attained. Experimental data for pesticides belonging to various classes of organic compounds were successfully interpreted by the developed model. Additionally, a linear dependence of the amount of pesticide sorbed on the initial analyte concentration in aqueous solution was obtained for a sampling time shorter than that required to reach sorption equilibrium.

scholarly journals Determination of Lactones in Wines by Headspace Solid-Phase Microextraction and Gas Chromatography Coupled with Mass Spectrometry

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
S. J. Pérez-Olivero ◽  
M. L. Pérez-Pont ◽  
J. E. Conde ◽  
J. P. Pérez-Trujillo
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Quantitative Analysis ◽  
Detection Limit ◽  
Ionic Strength ◽  
High Resolution ◽  
Solid Phase Microextraction ◽  
Solid Phase ◽  
Headspace Solid Phase Microextraction

Application of headspace solid-phase microextraction (HS-SPME) coupled with high-resolution gas chromatographic (HRGC) analysis was studied for determining lactones in wines. Six different SPME fibers were tested, and the influence of different factors such as temperature and time of desorption, ionic strength, time of extraction, content of sugar, ethanol, tannins and anthocyanins, and pH and influence of SO2were studied. The proposed HS-SPME-GC method is an appropriate technique for the quantitative analysis ofγ-butyrolactone,γ-hexalactone,trans-whiskey lactone,γ-octalactone,cis-whiskey lactone,γ-nonalactone,γ-decalactone,δ-decalactone, andγ-undecalactone in wines. Method reproducibility and repeatability ranged between 0.6 and 5.2% for all compounds. Detection limit forγ-butyrolactone was 0.17 mg/L and a fewμg/L for the rest of the compounds. The optimized method has been applied to several wine samples.

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