Improving Quantification of 13C CP-MAS NMR by steady state and well-defined data processing in variable contact time experiments

B. van Lagen, P.A. de Jager

Research output: Contribution to journalArticleAcademicpeer-review

7 Citations (Scopus)

Abstract

C-13 CP-MAS NMR is used as a non-destructive technique to measure the distribution of carbon types in humic substances. Although it is well-known that quantification of CP-MAS is problematic because different parts of the spectrum have different optimal contact times, a single contact time is used in most studies and in such cases C-13 CP-MAS NMR is only qualitative. Using Variable Contact Time experiments and back-extrapolating the signals for the various chemical shift regions to t=0 significantly improves quantification. Because signals decrease markedly during the beginning of an experiment, samples need a steady-state condition before acquisition of the Free Induction Decay (FID). Well-defined processing of the raw data significantly improves data quality. The effect of these various treatments on overall accuracy is shown.
Original languageEnglish
Pages (from-to)1211-1217
Number of pages7
JournalFressenius Environmental Bulletin
Volume12
Issue number10
Publication statusPublished - 2003

Keywords

  • natural organic-matter
  • linear prediction
  • humic substances
  • determining quantitation
  • peat bog
  • ft nmr
  • spectra
  • spectroscopy
  • soils
  • deposition

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