|کد مقاله||کد نشریه||سال انتشار||مقاله انگلیسی||ترجمه فارسی||نسخه تمام متن|
|5130746||1378705||2017||7 صفحه PDF||سفارش دهید||دانلود کنید|
- Advances in interfacing liquid chromatography and electron ionization mass spectrometry.
- Development of innovative sol-gel ion source coatings.
- Noticeable results with the silica-based ion source coating.
- Improved detection of high-molecular weight and/or high-polar compounds.
Advances in interfacing liquid chromatography and electron ionization mass spectrometry are presented. New ion source coatings synthesized by sol-gel technology were developed and tested as vaporization surfaces in terms of peak intensity, peak width and peak delay for the liquid chromatography-direct electron ionization mass spectrometry (Direct-EI) determination of environmental pollutants like polycyclic aromatic hydrocarbons and steroids. Silica-, titania-, and zirconia-based coatings were sprayed inside the stainless steel ion source and characterized in terms of thermal stability, film thickness and morphology. Negligible weight losses until 350-400Â Â°C were observed for all the materials, with coating thicknesses in the 6 (Â±1)-11 (Â±2) Î¼m range for optimal ionization process. The best performances in terms of both peak intensity and peak width were obtained by using the silica-based coating: the detection of the investigated compounds was feasible at low ng Î¼lâ1 levels with a good precision (RSDÂ <Â 9% for polycyclic aromatic hydrocarbons and <11% for hormones).
Journal: Analytica Chimica Acta - Volume 978, 25 July 2017, Pages 35-41