Solid-phase microextraction

From Wikipedia, the free encyclopedia
Jump to: navigation, search
SPME

Solid-phase microextraction, or SPME, is a sample preparation technique that involves the use of a fiber coated with an extracting phase, that can be a liquid (polymer) or a solid (sorbent), which extracts different kinds of analytes (including both volatile and non-volatile) from different kinds of media, that can be in liquid or gas phase.[1] The quantity of analyte extracted by the fibre is proportional to its concentration in the sample as long as equilibrium is reached or, in case of short time pre-equilibrium, with help of convection or agitation.

Analysis[edit]

After extraction, the SPME fiber is transferred to the injection port of separating instruments, such as a Gas Chromatograph, where desorption of the analyte takes place and analysis is carried out.

Advantages[edit]

The attraction of SPME is that the extraction is fast and simple and can be done usually without solvents, and detection limits can reach parts per trillion (ppt) levels for certain compounds. SPME also has great potential for field applications; on-site sampling can be done even by nonscientists without the need to have gas chromatography-mass spectrometry equipment at each location. When properly stored, samples can be analyzed days later in the laboratory without significant loss of volatiles.[citation needed]

See also[edit]

Solid phase extraction

Books[edit]

  • Pawliszyn J.: Handbook of Solid Phase Microextraction, Chemical Industry Press, 2009.
  • Pawliszyn J.: Solid Phase Microextraction: Theory and Practice, Wiley-VCH, 1997.
  • Pawliszyn J.: Applications of Solid Phase Microextraction, Royal Society of Chemistry, 1999.

References[edit]

  1. ^ Mitra, Somenath, ed. (2003). Sample Preparation Techniques in Analytical Chemistry. Wiley-Interscience. p. 113.  edit