Articles by Michael D. Hilf in JoVE
Characterization, Quantification and Compound-specific Isotopic Analysis of Pyrogenic Carbon Using Benzene Polycarboxylic Acids (BPCA) Daniel B. Wiedemeier1, Susan Q. Lang2, Merle Gierga3, Samuel Abiven1, Stefano M. Bernasconi3, Gretchen L. Früh-Green3, Irka Hajdas4, Ulrich M. Hanke1, Michael D. Hilf1, Cameron P. McIntyre4, Maximilian P. W. Scheider1, Rienk H. Smittenberg5, Lukas Wacker4, Guido L. B. Wiesenberg1, Michael W. I. Schmidt1 1Department of Geography, University of Zurich, 2Department of Earth and Ocean Sciences, University of South Carolina, 3Department of Earth Sciences, ETH Zurich, 4Laboratory of Ion Beam Physics, ETH Zurich, 5Department of Geological Sciences, Stockholm University We present the benzene polycarboxylic acid (BPCA) method for assessing pyrogenic carbon (PyC) in the environment. The compound-specific approach uniquely provides simultaneous information about the characteristics, quantity and isotopic composition (13C and 14C) of PyC.
Other articles by Michael D. Hilf on PubMed
Improved Assessment of Pyrogenic Carbon Quantity and Quality in Environmental Samples by High-performance Liquid Chromatography Journal of Chromatography. A. Aug, 2013 | Pubmed ID: 23880465 The analysis of pyrogenic carbon (PyC) in environmental samples is of great interest, e.g. for carbon cycle assessment, (bio-)char characterization and palaeo-environmental or archeological reconstruction. Here, an HPLC method (HPLC) is presented that reproducibly quantifies benzene polycarboxylic acids (BPCA) as molecular markers for PyC in various kinds of environmental samples. It operates at low pH without requiring an organic modifier and was thoroughly tested with PyC reference materials and a peatland core that served as a feasibility and plausibility check. Compared to the established gas chromatography (GC) method, the HPLC method results in higher BPCA quantification reproducibility by showing a significantly smaller coefficient of variation (HPLC: 5%, GC: 16-23%). It works well with small sample amounts, as for instance from sediment cores and aerosol collectors, and requires less sample preparation work than the GC method. Moreover, the here presented HPLC method facilitates (13)C and (14)C analyses on PyC from environmental samples.