Solvent microextraction into a single drop

MA Jeannot, FF Cantwell - Analytical chemistry, 1996 - ACS Publications
MA Jeannot, FF Cantwell
Analytical chemistry, 1996ACS Publications
An analytical technique is described which combines solvent extraction with gas
chromatographic (GC) analysis in a simple and inexpensive apparatus involving very little
solvent consumption. A small drop (8 μL) of a water-immiscible organic solvent, containing
an internal standard, is located at the end of a Teflon rod which is immersed in a stirred
aqueous sample solution. After the solution has been stirred for a prescribed period of time,
the probe is withdrawn from the aqueous solution, and the organic phase is sampled with a …
An analytical technique is described which combines solvent extraction with gas chromatographic (GC) analysis in a simple and inexpensive apparatus involving very little solvent consumption. A small drop (8 μL) of a water-immiscible organic solvent, containing an internal standard, is located at the end of a Teflon rod which is immersed in a stirred aqueous sample solution. After the solution has been stirred for a prescribed period of time, the probe is withdrawn from the aqueous solution, and the organic phase is sampled with a microsyringe and injected into the GC for quantification. The observed rate of solvent extraction is in good agreement with a convective−diffusive kinetic model. Analytically, the relative standard deviation of the method is 1.7% for a 5.00-min extraction of the analyte 4-methylacetophenone into n-octane.
ACS Publications
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