Novel Sample Preparation Technique To Improve Spectromicroscopic Analyses of Micrometer-Sized Particles

Carmen Höschen, Till Höschen, Carsten W. Mueller, Johann Lugmeier, Stefan Elgeti, Thilo Rennert, Ingrid Kögel-Knabner

Research output: Contribution to journalArticlepeer-review

22 Scopus citations

Abstract

Microscale processes occurring at biogeochemical interfaces in soils and sediments have fundamental impacts on phenomena at larger scales. To obtain the organo-mineral associations necessary for the study of biogeochemical interfaces, bulk samples are usually fractionated into microaggregates or micrometer-sized single particles. Such fine-grained mineral particles are often prepared for nanoscale secondary ion mass spectroscopy (NanoSIMS) investigations by depositing them on a carrier. This introduces topographic differences, which can strongly affect local sputtering efficiencies. Embedding in resin causes undesired C impurities. We present a novel method for preparing polished cross-sections of micrometer-sized primary soil particles that overcomes the problems of topography and C contamination. The particles are coated with a marker layer, embedded, and well-polished. The interpretation of NanoSIMS data is assisted by energy-dispersive X-ray spectroscopy on cross-sections prepared by a focused ion beam. In the cross-sections, organic assemblages on the primary soil particles become visible. This novel method significantly improves the quality of NanoSIMS measurements on grainy mineral samples, enabling better characterization of soil biogeochemical interfaces. In addition, this sample preparation technique may also improve results from other (spectro-) microscopic techniques.

Original languageEnglish
Pages (from-to)9874-9880
Number of pages7
JournalEnvironmental Science and Technology
Volume49
Issue number16
DOIs
StatePublished - 21 Jul 2015

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