Dr. Reiner Dohrmann

Section leader Technical Mineralogy and Clay Mineralogy in Sub-Department B2.1 Geophysical Exploration – Technical Mineralogy

Section leader L3.8 Technical Mineralogy, Sedimentology, LBEG

Tel.: +49-(0)511-643-2557
Fax: +49-(0)511-643-532557
Reiner.Dohrmann@bgr.de

Visiting address:
Stilleweg 2, Room D30
30655 Hannover

Fields of Research and Interest

• Quantitative phase analysis (QPA) of clays
• Development of new or modified clay mineralogical methods
• Applicability of bentonites in European HLRW repositories
• President International Association for the Study of Clays (AIPEA)
• Member of DIN-ISO

Methodology

• X-Ray diffraction, cation exchange capacity, layer charge density, complex combination of results for QPA
• Sedimentary petrography

Scientific Career

1986 – 1993	Mineralogist (Diplom), Tübingen University
1993 – 2000	RWTH Aachen
1997	PhD, RWTH Aachen
2000	Scientific Director, BGR/LBEG, head of technical mineralogy, sedimentology group

Publications (Reviewed articles)

• Dohrmann, R. 2006. Cation Exchange Capacity Methodology I: An Efficient Model for the Detection of Incorrect Cation Exchange Capacity and Exchangeable Cation Results. Applied Clay Science, 34, 31-37.
• Dohrmann, R. 2006. Cation Exchange Capacity Methodology II: proposal for a modified silver-thiourea method. Applied Clay Science, 34, 38-46.
• Dohrmann, R. 2006. Cation Exchange Capacity Methodology III: Correct exchangeable calcium determination of calcareous clays using a new silver-thiourea method. Applied Clay Science, 34, 47-57.
• Dohrmann, R. 2006. Problems in CEC determination of calcareous clayey sediments using the ammonium acetate method. J. Plant Nutr. Soil Sci., 169, 330-334
• Dohrmann, R., Kaufhold, S. 2009. Three new, quick CEC methods for determinining the amounts of exchangeable calcium cations in calcareous clays. Clays and Clay Minerals, 57(3), 338–352.
• Dohrmann, R., Kaufhold, S. 2010. Determination of exchangeable calcium of calcareous and gypsiferous bentonites. Clays and Clay Minerals, 58, 513–522
• Dohrmann, R., Kaufhold, S. 2014. Cation exchange and mineral reactions observed in MX 80 buffers samples of the prototype repository in situ experiment in Äspö, Sweden. Clays and Clay Minerals, 62, 357–373
• Dohrmann, R., Rüping, K.B., Kleber, M., Ufer, K. Jahn, R. 2009. Variation of preferred orientation in oriented clay mounts as a result of sample preparation and composition. Clays and Clay Minerals, 57, 686-694
• Dohrmann, R., Olsson, S., Kaufhold, S., Sellin, P. 2013. Mineralogical investigations of the first package of the alternative buffer material test – II. Exchangeable cation population rearrangement. Clay Minerals, 48, 215–233.
• Dohrmann, R., Genske, D., Karnland, O., Kaufhold, S., Kiviranta, L., Olsson, S., Plötze, M., Sandén, T., Sellin, P., Svensson, D., Valter, M. 2012. Interlaboratory CEC and Exchangeable Cation Study of Bentonite Buffer Materials: I. CU(II)-Triethylentetramine Method. Clays and Clay Minerals, 60, 162–175
• Dohrmann, R., Genske, D., Karnland, O., Kaufhold, S., Kiviranta, L., Olsson, S., Plötze, M., Sandén, T., Sellin, P., Svensson, D., Valter, M. 2012. Interlaboratory CEC and Exchangeable Cation Study of Bentonite Buffer Materials: II. Alternative Methods. Clays and Clay Minerals, 60, 176-185
• Kaufhold, S., Dohrmann, R. 2009. Stability of bentonites in salt solutions: I sodium chloride. Applied Clay Science, 45, 171-177.
• Kaufhold, S., Dohrmann, R. 2010. Stability of bentonites in salt solutions II. Potassium chloride solution — Initial step of illitization? Applied Clay Science, 49, 98-107.
• Kaufhold, S., Dohrmann, R., Klinkenberg, M. 2010. Water uptake capacity of bentonites. Clays and Clay Minerals, 58, 37–43
• Kaufhold, S., Dohrmann, R., Sandén, T., Sellin, P., Svensson, D. 2013. Mineralogical investigations of the first package of the alternative buffer material test – I. Alteration of bentonites. Clay Minerals, 48, 199–213.
• Kaufhold, S., Kaufhold, A., Jahn, R., Brito, S., Dohrmann, R., Hoffmann, R., Gliemann, H., Weidler, P., Frechen, M. 2009. A new massive deposit of allophane raw material in Ecuador. Clays and Clay Minerals, 57, 72-81.
• Kaufhold, S., Sanders, D., Hassel, A.-W., Dohrmann, R. 2015. Corrosion of high-level radioactive waste iron-canisters in contact with bentonite. Journal of Hazardous Materials, 285, 464–473
• Klinkenberg, M., Kaufhold, S., Dohrmann, R., Siegesmund, S. 2009. Influence of carbonate microfabrics on the failure strength of claystones. Engineering Geology, 107, 42-54.
• Müller, H.W., Dohrmann, R., Klosa, D., Rehder, S., Eckelmann, W. 2009. Comparison of two Procedures for Particle Size Analysis: KÖHN-pipette and X-ray Granulometry. Journal of Plant Nutrition and Soil Science, 172, 172-179.
  
• Schmitz, M., Scheeder, G., Bernau, S., Dohrmann, R., Germann, K. 2011. Dioxins in Primary Kaolin and Secondary Kaolinitic Clays. Environmental Science & Technology, 45, 461–467.
• Ufer, K., Kleeberg, R., Bergmann, J., Dohrmann, R. 2012. Rietveld refinement of disordered illite-smectite mixed layered structures by a recursive algorithm. I: One-dimensional patterns. Clays and Clay Minerals 60, 507–534
• Ufer, K., Kleeberg, R., Bergmann, J., Dohrmann, R. 2012. Rietveld refinement of disordered illite/smectite mixed layered minerals with a recursive algorithm. II: powder pattern refinement and quantitative phase analysis. Clays and Clay Minerals 60, 535–552

Complete List of Publications since 2007 (Geoportal of the Federal Institute for Geosciences and Natural Resources Search Results)

Patents

• Kaufhold, S., Decher, A., Dohrmann, R. (2000) Verfahren zur Bestimmung des Gehaltes an Tonmineralien in einem tonmineralhaltigen Material. - DE 19839531 A1
• Kaufhold, S., Dill, H., Dohrmann, R. 2013. Verfahren und Vorrichtung zum Bestimmen eines Mineralanteils eines Tonminerals, insbesondere quellfähigen Tonminerals in einem Gestein. Patent DE 102009017487.7; G01N 21/35