Ion-trap SIMS analysis of pinacolyl methylphosphonic acid on soil

Jani C Ingram, A. D. Appelhans, G. S. Groenewold

Research output: Contribution to journalArticle

25 Scopus citations

Abstract

The minimum detection limit and semi-quantitative determination of surface coverages of pinacolyl methylphosphonic acid (PMPA) on soil by static secondary-ion mass spectrometry (SIMS) are reported. The soil was exposed to aqueous solutions of PMPA and then analyzed on an ion-trap SIMS instrument. Mass spectrometry/mass spectrometry was utilized to discriminate against the chemical background inherent in environmental samples (such as soil). The quasimolecular ion [PMPA - H]- at m/z = 179 was trapped and then subsequently fragmented to form an ion at m/z = 95, which is interpreted as a loss of the pinacolyl olefin (C6H12) to form the methylphosphonic acid anion. The product ion at m/z = 95 was used to investigate the surface coverage of PMPA on the soil. The m/z = 95 product-ion abundance was observed to be linearly related to the PMPA surface coverage between 2 and 0.002 monolayers. The minimum detection limit is estimated at 0.008 monolayer (approximately 12 pg mm-2, three standard deviations of the blank). These data were compared with analyses performed by using a quadrupole SIMS instrument, which indicates an improvement in sensitivity by the ion-trap SIMS of a factor of 250. The results of this study demonstrate that ion-trap SIMS is a facile approach for determination of phosphonates on soil.

Original languageEnglish (US)
Pages (from-to)253-262
Number of pages10
JournalInternational Journal of Mass Spectrometry and Ion Processes
Volume175
Issue number3
StatePublished - 1998
Externally publishedYes

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Keywords

  • Ion trap
  • Pinacolyl methylphosphonic acid
  • Secondary-ion mass spectrometry
  • Soil

ASJC Scopus subject areas

  • Spectroscopy
  • Physical and Theoretical Chemistry

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