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Quantitative analysis by headspace solid phase microextraction (HS-SPME) of spiked samples containing twenty chlorobenzenes, nitrobenzenes and analines in model soil matrices was found to be possible when the calibration was performed with the same matrix. The response increased with addition of water to the soil samples, increased soil to headspace surface area and the use of polycrylate rather than polydimethylsiloxane as fibre coating material in the analysis of polar compounds. However, matrix effects, largely depending on the organic carbon content of the soil, were so significant that a quantitative analysis of real soil samples is not feasible with calibration using a model matrix. Also the use of standard addition and internal standard is complicated by the missing linearity of the calibration curves when approaching zero and the fact that analytes spiked into the soil matrix cannot be assumed to behave as those present beforehand. Thus, an accurate quantitative analysis of real soil samples can be expected only in cases where the HS-SPME equilibration process can be influenced towards an approximately exhaustive extraction of the analytes. Generally, the potential of HS-SPME in soil analysis is rather as a rapid, qualitative screening technique.

Additional information

Authors: FROMBERG A, JRC Ispra (IT);NILSSON T, JRC Ispra (IT);LARSEN B R, JRC Ispra (IT);MONTANARELLA L, JRC Ispra (IT);FACCHETTI S, JRC Ispra (IT);MADSEN J O, Technical University of Denmark, Department of Organic Chemistry, Lyngby (DK)
Bibliographic Reference: Article: Journal of Chromatography (1996), pp. 1-29
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