Consultant – Hans van der Sloot Consultancy

Email: hans@vanderslootconsultancy.nl

Education

B.S. Chemistry – Free University, Amsterdam, The Netherlands, 1968
M.S., Chemistry and Biochemistry – Free University, Amsterdam, The Netherlands, 1971
Ph.D., Chemistry and Biochemistry – Free University, Amsterdam, The Netherlands, 1976

Research Interests and Expertise

Leaching assessment and methods (including waste form performance), environmental performance of cementitious materials, (contaminated) soil, sludge and waste, nuclear and chemical waste, environmental remediation, management of residuals from energy production and waste to energy facilities, multi-element geochemical modeling of cementitious products, soil, sludge and waste systems. Relationship between laboratory, lysimeter and field scale testing in combination with geochemical modeling as basis for long term prediction of release.

Brief Biography

Dr. van der Sloot held different positions in the Netherlands Energy Research Foundation (ECN, Petten, The Netherlands) until December 2009. After retiring from ECN he started his private consultancy.

He is involved in standardization of leaching tests for waste, soil and construction products at national and international level (CEN, ISO, US EPA). He has been Associate editor for Waste Management for 20 years. He is active in developing a decision support tool for environmental impact assessment (LeachXS) in cooperation with Vanderbilt University (Nashville, USA), NRG (Petten, Netherlands) and Seigette Consultancy (Limmen, The Netherlands)

In cooperation with partners in the Cement Barriers Partnership under the sponsorship of the Consortium for Risk Evaluation with Stakeholder Participation (CRESP) and coordination by Vanderbilt University, he is involved in nuclear waste studies with the emphasis on testing and modeling of the source term for contaminant release from disposal facilities to soil and groundwater, in particular in support of long term assessment of disposal facilities. The pH dependence test (EPA1313, EN14429, EN14997 and ISO21268-4) in combination of geochemical modelling is his specialty in providing the chemical speciation fingerprint for subsequent modelling of reactive transport modelling scenarios.

His research and his standardization activities in collaboration with Vanderbilt University on leaching of contaminants from wastes and construction materials has been providing the foundation for environmental regulation of these materials by the Netherlands Ministry of Environment , at USEPA and the European Union’s Directorate General for the Environment. Dr. van der Sloot holds a PhD in Chemistry and Biochemistry from the Free University, Amsterdam, The Netherlands.

Since 2011 he is Adjunct Professor in the Department of Civil and Environmental Engineering within the Vanderbilt University School of Engineering.

CRESP Projects

• Cementitious Barriers Partnership
• Leaching Assessment for Alternative Waste Forms

Publications

Martha M. B. Santos, Jiannan (Nick) Chen, Chen Gruber, Hans van der Sloot, Kevin G. Brown, David S. Kosson, and Craig Benson. 2025. Hydrological Evaluation for Disposal of Glass Waste Forms at the Hanford Site, Washington – 25113. WM2025 Conference, March 9 – 13, 2025, Phoenix, Arizona, USA

Chen Gruber, Kevin G. Brown, Andrew C. Garrabrants, Johannes.C.L. Meeussen, Hans van der Sloot, David S. Kosson. Modeling Interfaces to Support Low-Level Waste Disposal System Performance Assessments – 20366. WM2020 Conference, March 8 – 12, 2020, Phoenix, Arizona, USA.

Chen Gruber, Zhiliang Chen, Jiannan Chen, Kevin G. Brown, Hans Meeussen, David S. Kosson, Andrew C. Garrabrants, Johannes Meeussen, and Hans van der Sloot (2023) Reducing the Uncertainty on Modeling Interfaces to Support Post-Closure of Hanford Waste Tanks System Performance Assessments. Waste Management 23579 WM2023 Conference. February 26 – March 2, 2023 Phoenix, Arizona, USA.

X Wang, AC Garrabrants, HA van der Sloot, Z Chen, KG Brown, B Hensel, DS Kosson. 2023 Leaching and geochemical evaluation of oxyanion partitioning within an active coal ash management unit. Chemical Engineering Journal, Volume 454, article id. 140406.

Zhiliang Chen, Peng Zhang, Kevin G. Brown, Hans van der Sloot, Johannes Meeussen, Andrew Garrabrants, Rossane DeLapp, David Kosson. 2022. Modeling of Oxidized Cementitious Waste Forms: Oxidation Depths Estimation and Tc Leaching Assessment Under Field Scenarios – 22040. WM2022 Conference, March 6 – 10, 2022, Phoenix, Arizona, USA.

Zhiliang Chen, Peng Zhang, Kevin G. Brown, Hans A. van der Sloot, Johannes C.L. Meeussen, Andrew C. Garrabrants, Rossane C. Delapp, Wooyong Um, David S. Kosson. Evaluating the impact of drying on leaching from a solidified/stabilized waste using a monolithic diffusion model. April 2023Waste Management 165:27-39

Xinyue Wang, Andrew C. Garrabrants, Zhiliang Chen, Hans A. van der Sloot, Kevin G. Brown, Qili Qiu, Rossane C. Delapp, Bruce Hensel, David S. Kosson, The Influence of Redox Conditions on Aqueous-Solid Partitioning of Arsenic and Selenium in a Closed Coal Ash Impoundment. Journal of Hazardous Materials, in process.2021.

Zhiliang Chen, Peng Zhang, Kevin G. Brown, Janelle L. Branch, Hans A. van der Sloot, Johannes C. L. Meeussen, Rossane C. Delapp, Wooyong Um, and David S. Kosson. Development of a Geochemical Speciation Model for Use in Evaluating Leaching from a Cementitious Radioactive Waste Form.  Environ. Sci. Technol. 2021, 55, 13, 8642–8653.

Peng Zhang, Zhiliang Chen, Kevin G. Brown, Andrew C. Garrabrants, Rossane C. Delapp, Johannes C.L. Meeussen, Hans A. van der Sloot, David Kosson, Impact of carbonation on leaching of constituents from a cementitious waste form for treatment of low activity waste at the DOE Hanford site. May 2022 Waste Management 144(10):431-444

Peng Zhang, Janelle Branch Lewis, Ofra Klein-BenDavid, Rossane Delapp, Andrew C. Garrabrants, Hans A. van der Sloot, David S. Kosson. The role of environmental conditions on the carbonation of an alkali-activated cementitious waste form.  Cement and Concrete Research Volume 151, January 2022, 106645.

Wen Fang, Guangxia Qi, Yonghong Wei, David S. Kosson, Hans A. van der Sloot, Jianguo Liu. Leaching characteristic of toxic trace elements in soils amended by sewage sludge compost: A comparison of field and laboratory investigations. Environmental Pollution, Volume 237, June 2018, Pages 244–252.

Zengqing Sun, Anya Vollpracht, Hans A. van der Sloot. pH dependent leaching characterization of major and trace elements from fly ash and metakaolin geopolymers.  Cement and Concrete Research 125, 2019, 105889.

Simone Neuhold, André van Zomeren, Joris J. Dijkstra, Hans A. van der Sloot, Peter Drissen, David Algermissen, Dirk Mudersbach, Susanne Schüler, Thomas Griessacher, Johann G. Raith, Roland Pomberger and Daniel Vollprecht. Investigation of Possible Leaching Control Mechanisms for Chromium and Vanadium in Electric Arc Furnace (EAF) Slags Using Combined Experimental and Modeling Approaches. Minerals 9 (9), 2019, 525.

Engelsen C.J., van der Sloot H.A., Kosson D.S. Leaching assessment methodologies and regulations for evaluating the use of secondary and recycled materials in concrete and mortars. In: Waste and By-Products in Cement-based Materials edited by Jorge de Brito, Carlos Thomas, Cesar Medina and Francisco Agrela, Elsevier, 2021.

Hans A. van der Sloot and David S. Kosson. Estimates of mineral stability constants derived from pH dependence leaching test data. 5th International Workshop on “Mechanisms and Modelling of Waste / Cement Interactions” March 27, 2019, Karlsruhe, Germany.

Andrew Garrabrants, Lesa Brown, Peng Zhang, Hans van der Sloot, Kevin Brown, Chen Gruber, and David Kosson. Experimental and Modeling Efforts to Predict Long-Term Geochemistry of Vault Concrete – Salt waste Interfaces at U.S. DOE Disposal Sites. 5th International Workshop on “Mechanisms and Modelling of Waste / Cement Interactions” March 27, 2019, Karlsruhe, Germany.

K.G. Brown, D.S. Kosson, H.A. van der Sloot, P. Seignette, and J.C.L. Meeussen. Software Quality Assurance for LeachXS/ORCHESTRA as a Tool for Assessment of Waste Management Systems Performance. WM2017 Conference, March 5-9, 2017, Phoenix, Arizona, USA.

H.A. van der Sloot, D.S. Kosson, N. Impens, N. Vanhoudt, Talal Almahayni, H. Vandenhove, L. Sweeck, R. Wiegers, J.L. Provis, C. Gasco ´, W. Schroeyers  (2017)  Leaching assessment as a component of environmental safety and durability analyses for NORM containing building materials.  In: Naturally Occurring Radioactive Materials in Construction – Integrating Radiation Protection in Reuse (COST Action Tu1301 NORM4BUILDING) 2017.  Ed. Wouter Schroeyers. Woodhead Publishing Series in Civil and Structural Engineering. Duxford, UK. ISBN: 9780081020098

David S. Kosson , Andrew C. Garrabrants, Rossane DeLapp, Hans A. van der Sloot. pH-dependent leaching of constituents of potential concern from concrete materials containing coal combustion fly ash. Chemosphere 103 (2014) 140–147. doi: 10.1016/j.chemosphere.2013.11.049. Epub 2013 Dec 19.

Andrew C. Garrabrants, David S. Kosson, Rossane DeLapp, Hans A. van der Sloot. Effect of coal combustion fly ash use in concrete on the mass transport release of constituents of potential concern. Chemosphere 103 (2014) 131–139.  doi: 10.1016/j.chemosphere.2013.11.048. Epub 2013 Dec 19.

D.S. Kosson, H.A. van der Sloot, A.C. Garrabrants and P.F.A.B. Seignette (2014). Leaching Test Relationships, Laboratory-to-Field Comparisons and Recommendations for Leaching Evaluation using the Leaching Environmental Assessment Framework (LEAF) EPA-600/R-14/061.

Arnold, .J, Kosson, D.S., Brown, K.G., Meeussen, J.C.L. and van der Sloot, H.A. (2013). Characterization and modeling of major constituent equilibrium chemistry of a blended cement mortar. EPJ Web of Conferences, 56, 01004 (2013).

Brown, K.G., Arnold, J., Sarkar, S., Flach, G., van der Sloot, H.A., Meeussen, J.C.L. and Kosson, D.S. (2013). Modeling carbonation of high-level waste tank integrity and closure.  EPJ Web of Conferences, 56 (2013) 05003.

Van der Sloot, H. A. and Kosson, D.S. (2012) Use of characterisation leaching tests and associated modelling tools in assessing the hazardous nature of wastes. Journal of Hazardous Materials 207–208 (2012) 36–43. doi: 10.1016/j.jhazmat.2011.03.119. Epub 2011 Apr 8.

Sarkar, S., Kosson, D.S., Mahadevan, S., Meeussen, J.C.L, van der Sloot, H.A, Arnold, J.R. and Brown, KG. (2012). Bayesian calibration of thermodynamic parameters for geochemical speciation modeling of cementitious materials.  Cement and Concrete Research, 42:889-902. DOI: 10.1016/j.cemconres.2012.02.004

Sarkar, S., Mahadevan, S., Meeussen, J.C.L., van der Sloot, H.A. and Kosson, D.S. (2012).  Sensitivity analysis of damage in cement materials under sulfate attack and calcium leaching.
J. of Materials in Civil Engineering, 24(4):430-440. DOI: 10.1061/(ASCE)MT.1943-5533.0000407

Van der Sloot, H.A., van Zomeren. (2012) Characterisation Leaching Tests and Associated Geochemical Speciation Modelling to Assess Long Term Release Behaviour from Extractive Wastes. Mine Water and the Environment. Mine Water Environ 31:92–103. DOI: 10.1007/s10230-012-0182-8

Engelsen CJ, van der Sloot HA, Wibetoe G, Justnes H, Lund W, Stoltenberg-Hansson E. (2010) Leaching characterisation and geochemical modelling of minor and trace elements released from recycled concrete aggregates. Cement and Concrete Research; 40: 1639-1649. DOI: 10.1016/j.cemconres.2010.08.001

Van der Sloot, H. A., van Zomeren, A., Meeussen, J. C. L., Seignette, P., Bleijerveld, R., 2007. Interpretation of test method selection, validation against field data, and predictive modelling for impact evaluation of stabilised waste disposal. Journal of Hazardous Materials 141, 354-369. doi:10.1016/j.jhazmat.2006.05.106

Van der Sloot, H.A. (2000) Comparison of the characteristic leaching behaviour of cements using standard (EN 196-1) cement-mortar and an assessment of their long-term environmental behaviour in construction products during service life and recycling. Cement & Concrete Research 30, 1079 – 1096. DOI: 10.1016/S0008-8846(00)00287-8

Awards

ISCOWA Award 1997. Award issued at the 3rd WASCON conference “Putting Theory into Practice” held in Houthem, The Netherlands, June 4-6, 1997 for most significant contribution to the development in the field of environmental aspects of reuse of waste materials in construction.

Best paper at Landfill Conference Sardinia 1997 for The self-forming and self-repairing sealing method.

Best paper in Applied Geochemistry for 2006 – pH dependence test applied to incinerator bottom ash

Best paper in Mine Water and the Environment for the year 2012 on pH dependence test applied to mining waste

Selected Synergistic Activities

1. CEN/TC351, convenor of Working Group 5 on content and analysis methods for construction products and member of Working Group 1 on leach test methods for construction products.
2. Member of CEN/TC444 Environmental Characterization (Formerly CEN/TC292; from 1993) .
3. Chairman of Dutch standardization committee on Leaching, NEN, Delft (since 1982)
4. Chairman of the CEN/TC 292 (Waste Characterization) Working Group 6 Leaching (1993 – 2014)
5. Chairman of ISO TC 190 (Soil) Working Group 6 on Leaching (1997 – 2011)
6. Co-developer of LeachXS
7. Associate editor for Waste Management (1998 – 2018)

Collaborations

Vanderbilt: D. S. Kosson, K. Brown, A. Garrabrants
ECN part of TNO: P. Seignette, A. van Zomeren.

TNO: J.J. Dijkstra.

Nuclear Research Group: J.C.L. Meeussen

University of Padua: R. Cossu

Other Universities and Research Centers:  Pinjing He (Tongji University), Jianguo Lui (Tsinghua University), Nadya Teutsch (GSI, Israel), Richard Burgdorf (Chemcentre, Perth,

Graduate Student Advisees – Vanderbilt University

Graduate Students Advised (Ph.D. 11 completed): Siyuan Yu (2024), Xinyue Wang (2022), Peng Zhang (2021), Wen Fang (2019), Jing-Jing Bu (2018), Janelle Branch (2017), Josh Arnold (2014), Sohini Sarkar (2010), Sarynna Lopez Mesa (2006), in Europe Mojca Loncnar (2014) and Christian Engelsen (2012)

Additional Information

International Waste Working Group