Solid-phase extraction(SPE)is a popular method for sample preparation.It is not only suitable for concentration of trace amount of organic compounds in air but also used abroad in preprocessing of aqueous samples and biomedicine samples.In this paper the evolution of solid-phase extraction used in chromatography during a half of century was described.It was discussed that the nature and properties of all sorts of adsorbents.The SPE sorbents commonly used in practice are inorganic compounds such as silica ge...
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