Department of Analytical Chemistry, University of Valencia, Dr. Moliner 50, 46100 Burjassot, Valencia, Spain.
J Chromatogr A. 2012 Nov 9;1263:43-50. doi: 10.1016/j.chroma.2012.09.034. Epub 2012 Sep 17.
This study shows that ultrasonic assisted extraction is a good practise for removing impurities from sorbents used for matrix-solid phase dispersion (MSPD). A previous washing of the sorbent with an organic solvent or mixture of solvents eliminates part of the interferences, but this treatment is not enough for the quantification of PAHs at ng/g levels. It is demonstrated that the determination of traces of polycyclic aromatic hydrocarbons (PAHs) in solid samples processed by matrix-solid phase dispersion (MSPD) may be severely affected by the presence of sorbent impurities. Different extraction solvents and sonication conditions have been tested, and on the basis of the results obtained a new approach is presented for cleaning sorbents typically used in MSPD such C(18), silica or Florisil. The utility of the described approach has been illustrated by analysing by liquid chromatography and fluorescence detection different marine sediments.
本研究表明，超声辅助提取是一种从用于基质固相分散（MSPD）的吸附剂中去除杂质的好方法。用有机溶剂或混合溶剂预先清洗吸附剂可以去除部分干扰物，但这种处理对于 ng/g 水平的多环芳烃的定量分析还不够。实验证明，采用基质固相分散（MSPD）处理的固体样品中痕量多环芳烃（PAHs）的测定可能会受到吸附剂杂质的严重影响。已经测试了不同的提取溶剂和超声条件，并基于获得的结果提出了一种新的方法来清洁 MSPD 中常用的吸附剂，如 C(18)、硅胶或 Florisil。通过液相色谱和荧光检测分析不同的海洋沉积物，说明了所描述方法的实用性。
