TY - JOUR
T1 - Submicron scale imaging of soil organic matter dynamics using NanoSIMS - From single particles to intact aggregates
AU - Mueller, Carsten W.
AU - Kölbl, Angelika
AU - Hoeschen, Carmen
AU - Hillion, François
AU - Heister, Katja
AU - Herrmann, Anke M.
AU - Kögel-Knabner, Ingrid
N1 - Funding Information:
We are grateful for the funding of the NanoSIMS instrument at the Lehrstuhl für Bodenkunde of the TU München by the Deutsche Forschungsgemeinschaft (KO 1035/38-1). We also thank Dr. Marianne Hanzlik (Institute of Electron Microscopy, Technische Universität München, Garching) for assistance in SEM measurements and Karin Pritsch (Helmholtz Zentrum München) for help in optical stereo microscopy. Moreover, we thank Galina Moutchnik for her assistance in NanoSIMS measurements at the TU München. We also thank two anonymous reviewers for constructive comments that helped to improve the manuscript.
PY - 2012/1
Y1 - 2012/1
N2 - The specific features of the nano-scale secondary ion mass spectrometry (NanoSIMS) technology with the simultaneous analysis of up to seven ion species with high mass and lateral resolution enables us to perform multi-element and stable isotope measurements at the submicron scale. To elucidate the power of this technique, we performed an incubation experiment with soil particles of the fine silt and clay fractions (from an Albic Luvisol), with occluded particulate organic material and intact soil aggregates (from a Haplic Chernozem), using a 13C and 15N labelled amino acid mixture as tracer. Before and during 6-day incubation after the addition of the label, samples were consecutively prepared for NanoSIMS analysis. For this purpose, two different sample preparation techniques were developed: (i) wet deposition and (ii) the sectioning of epoxy resin embedded samples. Single soil particles (fine silt/clay fraction) showed an enrichment of 13C and 15N after label addition that decreased over time. On aggregates of particulate organic matter, re-aggregated during the 6-day incubation experiment, we could show a spatially heterogeneous enrichment of 13C and 15N on the particle surface. The enrichment in 15N demonstrated the diffusion of dissolved organic matter into intact soil aggregate interiors. The prospects of NanoSIMS for three dimensional studies of stable C and N isotopes in organo-mineral associations is demonstrated by the recorded depth profiles of the organic matter distribution on mineral particles.
AB - The specific features of the nano-scale secondary ion mass spectrometry (NanoSIMS) technology with the simultaneous analysis of up to seven ion species with high mass and lateral resolution enables us to perform multi-element and stable isotope measurements at the submicron scale. To elucidate the power of this technique, we performed an incubation experiment with soil particles of the fine silt and clay fractions (from an Albic Luvisol), with occluded particulate organic material and intact soil aggregates (from a Haplic Chernozem), using a 13C and 15N labelled amino acid mixture as tracer. Before and during 6-day incubation after the addition of the label, samples were consecutively prepared for NanoSIMS analysis. For this purpose, two different sample preparation techniques were developed: (i) wet deposition and (ii) the sectioning of epoxy resin embedded samples. Single soil particles (fine silt/clay fraction) showed an enrichment of 13C and 15N after label addition that decreased over time. On aggregates of particulate organic matter, re-aggregated during the 6-day incubation experiment, we could show a spatially heterogeneous enrichment of 13C and 15N on the particle surface. The enrichment in 15N demonstrated the diffusion of dissolved organic matter into intact soil aggregate interiors. The prospects of NanoSIMS for three dimensional studies of stable C and N isotopes in organo-mineral associations is demonstrated by the recorded depth profiles of the organic matter distribution on mineral particles.
UR - http://www.scopus.com/inward/record.url?scp=83955161752&partnerID=8YFLogxK
U2 - 10.1016/j.orggeochem.2011.06.003
DO - 10.1016/j.orggeochem.2011.06.003
M3 - Article
AN - SCOPUS:83955161752
SN - 0146-6380
VL - 42
SP - 1476
EP - 1488
JO - Organic Geochemistry
JF - Organic Geochemistry
IS - 12
ER -