A rapid and efficient determination of natural estrogens in soils by pressurised liquid extraction and gas chromatography-mass spectrometry

作者：Beck Josefine^*; Totsche Kai Uwe; Koegel Knabner Ingrid

来源：Chemosphere, 2008, 71(5): 954-960.

DOI：10.1016/j.chemosphere.2007.11.062

• steroids
• pressurized liquid extraction (PLE)
• accelerated solvent extraction (ASE)
• agricultural soil
• soil extraction

We present a new analytical procedure for the extraction and determination of natural estrogens in soils based on pressurised liquid extraction and GC-MS determination. After testing twelve solvents, acetone proved to be the most efficient extractant. The optimum extraction temperature is 60 degrees C. Soil extracts have to be purified and concentrated by G 18 solid phase extraction. The dried extracts are derivatised by N-methyl-N-(trimethylsilyl)trifluoro-acetamide before measurement by GC-MS. Recoveries of 79-103% with relative standard deviations <= 13% document reliability of this method. Further, rapidity of extraction and a low detection limit (1 ng kg(-1)) represent an improvement of estrogen analysis in soils compared to established procedures.

• 出版日期2008-3