Impurities released from extractive phases used in the analysis of pesticides

E. Benfenati, S. Garofani, M. Natangelo, S. Mangiapan, R. Fanelli

Research output: Contribution to journalArticle


Elution fractions relative to solid phase extraction (SPE) procedures using C-18 bonded silica and Carbopack B columns plus C-18 membranes have been analyzed by gas chromatography-mass spectrometry (GC-MS) for the characterization of interfering compounds from the phases. Alkanes, alkenes, phthalates and some silyl compounds (silanols, siloxanes) have been tentatively identified. Experiments on commercial C-18 phases prepacked in plastic tubes show that the increased interference compared to the phases alone comes from the polymer container. N-butylbenzensulfonamide (NBBSA) was identified as causing interference when the extraction device used for SPE involved plastic components. Increasing amounts of silanol interferences released from the C-18 phases were observed after passage of the water sample, depending on the acidic pH, as evidence of the hydrolysis of the bonded silica.

Original languageEnglish
Pages (from-to)23-30
Number of pages8
JournalInternational Journal of Environmental Analytical Chemistry
Issue number1-4
Publication statusPublished - 1995


  • gas chromatography-mass spectrometry
  • impurities
  • N-butylbenzensulfonamide silanols
  • Solid phase extraction
  • water analysis

ASJC Scopus subject areas

  • Analytical Chemistry
  • Public Health, Environmental and Occupational Health
  • Water Science and Technology
  • Environmental Chemistry
  • Soil Science
  • Health, Toxicology and Mutagenesis
  • Waste Management and Disposal
  • Pollution

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