RadChem 2026

Session

Separation & Speciation

11 May 2026, 15:30

Casino Conference Centre

Conveners

Separation & Speciation: SEP 1

• Jiří Janda (-)
• Andreas Geist (Karlsruhe Institute of Technology (KIT))

Separation & Speciation: Poster session

• There are no conveners in this block

Separation & Speciation: SEP2

• Kenneth Czerwinski (University of Nevada, Las Vegas)
• Nora Vajda (RadAnal Ltd.)

Separation & Speciation: SEP 3

• Pavle Mocilac (Lanzhou University)
• Jan John (České vysoké učení technické v Praze)

Separation & Speciation: SEP 4

• Duoqiang Pan
• Paul Dutheil

Separation & Speciation: SEP 5

• Mojmír Němec (Czech Technical University in Prague, FNSPE, Department of Nuclear Chemistry)
• Alex Tarancon Sanz (Universitat de Barcelona)

Separation & Speciation: SEP 6

• Viktor Goliáš (Charles University in Prague, Faculty of Science, Department of Geochemistry, Mineralogy and Mineral ressources)
• Sang-Han Lee (Korea Research Institute of Standards and Science)

1274. Extraction chromatographic separation of all actinides using single or stacked columns

Nora Vajda (RadAnal Ltd.)

11/05/2026, 15:30

Separation Methods, Speciation

Invited

Methods for the determination of all actinides including thorium, uranium, neptunium, plutonium, americium and curium are of major importance for nuclear chemical technology, radiation protection and environmental control. Combined separation procedures, whatever measurement technique is joined to them, make the analysis time shorter, allow the complex analysis from single sample aliquot and...

1226. Speciation of Polonium in Aqueous Solutions: First insights of X-ray Absorption Spectroscopy

Paul Dutheil (Université de Strasbourg, CNRS, IPHC UMR 7178, 23 Rue du Loess, 67200, Strasbourg, France)

11/05/2026, 16:00

Separation Methods, Speciation

Verbal

Polonium (Po) is receiving increasing attention due to its pronounced toxicity, natural presence in uranium-rich environments and its artificial production in nuclear industry activities (e.g. in lead-bismuth cooled fast neutron reactors). This has led to a real need to understand the chemical behavior of Po in various environments, especially since that the aqueous chemistry of Po remains...

1233. Optimization of ⁹³Mo radiochemical method for radioactive waste characterization: Improved Analytical Performance and Understanding on Separation Mechanisms

Matic Dokl (Technical University of Denmark)

11/05/2026, 16:20

Separation Methods, Speciation

Verbal

Molybdenum-93 is a long-lived (t½= 4839(63) y) activation product of increasing relevance for radioactive waste management, yet its determination in complex matrices remains analytically challenging due to its photon and electron emissions (QEC ≈ 406 keV dominant K‑shell X‑rays around 16.5–16.6 keV with associated Auger/conversion electrons) and interferences from chemically similar...

1214. Chromatographic separation of ¹⁰⁷Pd for characterization of radioactive waste

Marko Štrok (Jožef Stefan Institute)

11/05/2026, 16:40

Separation Methods, Speciation

Verbal

Pd‑107 is the second longest‑lived fission product after iodine‑129, with a half‑life of 6.5 × 10⁶ years. Owing to its persistence and radiological relevance, reliable quantification of Pd‑107 is essential for assessing inventories in spent nuclear fuel and high‑level radioactive waste. Since Pd‑107 is a pure β‑emitter with a maximum β‑energy of 34.1 keV and lacks γ‑emission, its analytical...

1146. Recovery Correction and Quantitative Reliability Assessment of ⁹⁹Tc Radiochemical Analysis Using Rhenium as a Surrogate Tracer and TEVA Resin Separation

BOGIL KIM

11/05/2026, 17:15

Separation Methods, Speciation

Poster

Technetium-99 (Tc-99) is a long-lived beta-emitting radionuclide of major concern in radioactive waste characterization, environmental monitoring, and nuclear facility decommissioning. Because Tc-99 is highly mobile in the environment and difficult to quantify at low activity levels, reliable radiochemical separation and accurate recovery correction are essential for precise determination....

1150. A study on removal of Cs from simulated seawater by ammonium phosphomolybdate (AMP) and natural zeolite alginates

Dr CHUAN-PIN LEE (Center for Energy and Environmental Research , National Tsing Hua University 300044(NTHU) Taiwan), Mr Yu-Hung Wang (Institute of Nuclear Engineering and Science, National Tsing Hua University, Hsinchu 300044, Taiwan (R.O.C)), Ms Liang-Yu Tao (Radiation Monitoring Center, Nuclear Safety Commission, Kaohsiung City 833172, Taiwan (R.O.C))

11/05/2026, 17:18

Separation Methods, Speciation

Poster

In this study, ammonium phosphomolybdate (AMP) and natural zeolite microcapsules with an excellent sorption property for Cs were encapsulated in the biopolymer matrices (sodium alginate, NaALG) to look into the removal of Cs in the simulated seawater induced by an emergency accident of nuclear power facilities. The results revealed that a relatively higher distribution coefficient (Kd) of Cs...

1152. Ti-based core-shell shaping for Ac-225/Bi-213 separation

Thomas Staes (SCK CEN)

11/05/2026, 17:21

Separation Methods, Speciation

Poster

Cancer remains one of the leading causes of death worldwide, requiring innovative methods for its treatment such as targeted alpha therapy with Bi-213-based radiopharmaceuticals. Alpha radiation is especially promising as it enables maximum destruction of malignant cells while minimizing cytotoxicity on the surrounding healthy tissue. However, current challenges in separating the radioactive...

1153. Development of radiation-stable and selective sorbent materials for direct 213Bi generators

Jasper Mampaey (SCK CEN)

11/05/2026, 17:24

Separation Methods, Speciation

Poster

Developing effective cancer treatment strategies remains a global challenge. Targeted alpha therapy (TAT) with Bi-213 as alpha emitter has emerged as a promising approach, offering cytotoxic effects on cancer cells while minimizing damage to healthy tissue. However, Bi-213 production is limited due to the lack of sorbent materials that are both selective and resistant to acidic environments...

1177. Efficient removal of perrhenate (ReO4−) as a non-radioactive surrogate for pertechnetate (TcO4−) from high-chloride and nitrate media by bis-guanidinium salts

Mr Lapislazuli Chekrain Valappil

11/05/2026, 17:27

Separation Methods, Speciation

Poster

Technetium-99 (⁹⁹Tc), a troublesome radioisotope prevalent in nuclear liquid waste, poses significant environmental and human health hazards due to its long half-life, high fission yield, and high environmental mobility. The latter is particularly relevant because, in addition to a fission product in nuclear power plants, the isotope ^99mTc is used in radiodiagnostics and...

1202. Automation of AMP Pre-treatment for 60 L Seawater Cs-137 Analysis: Comparative Evaluation of Recovery Yield and Reduction of Hands-on Time

BOGIL KIM

11/05/2026, 17:30

Separation Methods, Speciation

Poster

Ammonium molybdophosphate (AMP) pre-treatment is widely used for radiocesium (Cs-137) analysis in large-volume seawater samples; however, conventional manual procedures involve substantial operational challenges, including handling of bulk samples (e.g., 60 L), strong-acid dosing for pH adjustment, and potential variability in recovery during settling, supernatant decantation, and sorbent...

1213. Effect of sulfation and complexation on the sorption of La, Eu and Lu on tetravalent metal oxides

Topi Suominen (University of Helsinki)

11/05/2026, 17:33

Separation Methods, Speciation

Poster

Selective separation of rare-earth elements (REEs) is a central challenge in sustainable REE supply and recycling and can be useful in the radiochemical applications of these elements, for example in radiopharmaceutical chemistry and waste treatment. A hydrothermal route to synthesize tetravalent metal oxides (ZrO2, TiO2, SnO2) and their sulfated analogues was tested and their performance in...

1232. Rapid chemical separation of niobium for ⁹⁴Nb activity measurement in radioactive wastes

Dr Gyuhyeon Kim (Korasol, Co., Ltd.), Dr Kwang-Soon Choi (Korasol, Co., Ltd.)

11/05/2026, 17:36

Separation Methods, Speciation

Poster

According to the regulatory guidelines of the Nuclear Safety and Security Commission of South Korea, the activity concentrations of fourteen key radionuclides, including Nb-94, must be determined for the acceptance of radioactive waste, and analytical laboratories are required to demonstrate the capability to evaluate activity levels down to 1% of the disposal limit.

Although Nb-94 can be...

1296. Conceptual design of a tritium removal system to improve tritium removal efficiency and increase processing capacity at room temperature

Seung-il Kim (Neosiskorea Co. Ltd.)

11/05/2026, 17:39

Separation Methods, Speciation

Poster

Tritium is a radioactive beta emission isotope of hydrogen with a mass of 3.0 and is mainly present as tritiated water(HTO) in wastewater discharged from nuclear facilities. However, since HTO and H2O have very similar physical and chemical properties, it is very difficult to separate a trace amount of HTO mixed in a large amount of water (H2O). There is a commercialized isotope exchange and...

1300. CHALMEX Solvent Extraction for Spent Fuel Recycling: Performance, Scale-Up and Safety Considerations

Letizia Di Matteo (Chalmers University of Technology)

11/05/2026, 17:42

Separation Methods, Speciation

Poster

Closing the nuclear fuel cycle through advanced reprocessing of spent nuclear fuel is a key strategy to improve resource utilization, reduce the long-term radiotoxicity of high-level waste, and minimize the volume destined for deep geological disposal. A wide range of partitioning and separation approaches has therefore been investigated to recover fissile and fertile materials, particularly...

1318. Comparison of the effectiveness of various extraction agents for separating europium into ionic liquids

Daria Matějková (Czech technical University in Prague, Department of Nuclear Chemistry, Brehova 7, 115 19 Prague 1, Czech Republic)

11/05/2026, 17:45

Separation Methods, Speciation

Poster

The research is focused on comparing the effectiveness of various extraction agents for separation/extraction of europium from different aqueous phases into ionic liquids.This comparison was carried out in order to describe the influence of several key parameters on the extraction efficiency (pH, extractant concentration, possible synergism between extractants) which could help to clarify the...

1340. ELECTROCHEMICAL BEHAVIOUR OF SELECTED METALS IN IONIC LIQUIDS FOR ELECTRODEPOSITION APPLICATIONS

Michal Ficel (KJCH FJFI ČVUT)

11/05/2026, 17:48

Separation Methods, Speciation

Poster

Ionic liquids represent a class of compounds with unique physicochemical properties, such as negligible vapour pressure, high thermal and radiation stability, and wide electrochemical window. In combination with suitable extractants, they may serve as potential alternatives to commonly used volatile organic solvents in liquid-liquid extraction processes. Two-stage process consisting of the...

1341. Static Testing Varying Ratio of Iodine or Iodomethane with Silver Zeolite – Capacity and Morphology

Rachael Roenfeldt

11/05/2026, 17:51

Separation Methods, Speciation

Poster

Radioiodine released during aqueous reprocessing must have high efficiency of capture due to environmental and safety reasons. There are various methods for capturing radioiodine such as caustic scrubbing, mercury nitrate solutions and solid sorbents. Each of these three techniques have different affinities for inorganic and organoiodines, but all radioiodine’s must be captured. Generally,...

1343. Separation of Zr in complex Ca rich matrices in nuclear decommissioning

Karel Burian (UJV Řež, a.s.)

11/05/2026, 17:54

Separation Methods, Speciation

Poster

TEVA resin was found to be inefficient for Zr separation in Ca rich matrices. Two alternative resins TBP and UTEVA resin were evaluated as replacements. For both resins it's possible to load sample
in 8-10 M HCl and retain Zr, meanwhile Ca is not retained.

TBP resin does not only retain Zr in given conditions, but it also retains Nb and Fe, which are also eluted Zr with 4 M HCl. Hence...

1347. Selective dissolution and Separation of Lanthanides from Simulated Spent Fuel Using Betaine-Lactic Acid Deep Eutectic Solvent

Fangli Fan

11/05/2026, 17:57

Separation Methods, Speciation

Poster

Deep eutectic solvents (DESs), a novel class of environmentally benign solvents, have emerged as a key focus in the field of metal ion separation. DESs are eutectic mixtures formed by combining hydrogen bond donors (HBDs) and hydrogen bond acceptors (HBAs) in specific molar ratios, resulting in melting points significantly lower than those of the individual components and often rendering them...

1351. Removal of Iron and Aluminium from Reactor Storage Pool Water Using Polymer Membranes

Kryštof Konečný (CTU in Prague, CVR Rez, Czech Republic)

11/05/2026, 18:00

Separation Methods, Speciation

Poster

The Research Centre Řež operates the LVR-15 light-water research reactor with an operational thermal output of 10 MW. The reactor is used for experimental purposes and for the production of radioisotopes for medical and industrial applications. The system includes a storage pool B used for long-term storage of materials used in irradiation (e.g., probes or irradiation channels). In most cases,...

1360. Separation and Recovery of the Platinum Group Metals Pd, Ru and Rh by adsorption on hexacyanoferrates structures for spent nuclear fuel reprocessing

Dr Iga Zuba (Czech Technical Univeristy, Institute of Nuclear Chemistry and Technology)

11/05/2026, 18:03

Separation Methods, Speciation

Poster

Palladium (Pd), ruthenium (Ru), and rhodium (Rh) are platinum group metals (PGM) present in spent nuclear fuel. These elements play important and irreplaceable roles in many industrial applications in modern society, including catalysis, electronics, and pharmaceuticals. However, their extremely low abundance in the Earth’s crust, combined with their high demand and cost, has intensified the...

1362. Remarkable Separation of Trace Amount Plutonium Using a Hy-drophilic Multiamide Ligand: Synthesis, Extraction, Spectroscopic, Crystal Structure and Density Functional Theory Studies

Tiansheng He (China Institute of Atomic Energy)

11/05/2026, 18:06

Separation Methods, Speciation

Poster

The removal of trace plutonium (Pu) from uranium products and organic wastes during spent nuclear fuel reprocessing remains a critical challenge, resulting in excessive plutonium content in uranium products and waste organic liquid. Currently, most organic ligands with selective separation functions are lipophilic, while research on water-soluble highly selective ligands is relatively scarce,...

1370. TK300 - A new calixarene-based resin for the separation of Cs

Illarion Dovhyi (Triskem International)

11/05/2026, 18:09

Separation Methods, Speciation

Poster

TrisKem International, ZAC de l’Eperon – 3 rue des Champs Geons, 35170-Bruz, FRANCE

Isotopes of Cs ($^{134}$Cs, $^{135}$Cs, $^{137}$Cs) are important markers of artificial contamination. A fast and selective separation of Cs and interfering elements is important for precise analysis using low-level ICP-MS.

A new resin (TK300) based on a calixarene and a fluorinated alcohol was...

1378. New developments in Triskem: Preparation of extraction chromatographic separation materials based on new non-resin supports

Dr Aude Bombard (Triskem)

11/05/2026, 18:12

Separation Methods, Speciation

Poster

Triskem develops extraction chromatographic resins specific for radionuclides and/or group of radionuclides that are used in different fields such as environmental monitoring, decommissioning, nuclear medicine, and more. Depending on the application, the resin format is not always the most efficient option. This is why in the last years Triskem has initiated the development of new formats such...

1387. Sulfur-containing extraction systems for Rh, Ru and Pd in nitrate media relevant to spent nuclear fuel reprocessing

Ondřej Holas

11/05/2026, 18:15

Separation Methods, Speciation

Poster

Platinum group metals (PGMs) are listed among critical raw materials essential for economic development, everyday life, and industrial applications as defined by the European Commission [1]. Spent nuclear fuel represents a promising secondary resource, as PGMs are present in higher concentrations than in primary ores [2]. Their recovery could also contribute to reducing the overall cost of...

1229. The Role of Group Actinide Separation Process (GrASP) for a Sustainable Fuel Cycle

Quinn Summerfield

12/05/2026, 08:30

Separation Methods, Speciation

Invited

As energy demands increase due to technological advancements like data centers and AI-technology, discussion surrounding the reprocessing of used nuclear fuel has been escalating. The US is at risk of undermining its status as a world leader in nuclear by having no clear plan to deal with the nearly 100,000 MTHM of used nuclear fuel currently in interim storage. An expansion of the well-known...

1180. Pyrochemical Group Separation of Lanthanides from Spent Nuclear Fuel Powder

Mu Lin (Institute of Modern Physics, Chinese Academy of Sciences)

12/05/2026, 09:00

Separation Methods, Speciation

Verbal

Accelerator-Driven Advanced Nuclear Energy System (ADANES) is currently under development and construction at the Institute of Modern Physics, Chinese Academy of Sciences. The ADANES design aims to burn spent nuclear fuel (SNF) and utilize the uranium content for electricity generation. To achieve high-efficiency uranium utilization, fast neutron poisons must be removed from the SNF....

1313. N,N-Dibutyl Octanamide (DBOA)–Based Solvent Systems for Actinide Co-Extraction: A TBP Alternative for the CHALMEX Process

Esraa Darwish (Chalmers University of Technology)

12/05/2026, 09:20

Separation Methods, Speciation

Verbal

Division of Nuclear Chemistry and Industrial Materials Recycling, Department of Chemistry and Chemical Engineering, Chalmers University of Technology, 412 96 Gothenburg, Sweden

Closing the nuclear fuel cycle requires separation processes that recover actinides efficiently while minimizing the radiotoxicity and heat load of the waste requiring long-term storage. In this context, advanced...

1187. Novel Highly Selective Bistriazolyl-Phenanthroline and Phenanthroline-Dicarboxamide Ligands for i-SANEX Separations

Pavle Mocilac (Lanzhou University)

12/05/2026, 09:40

Separation Methods, Speciation

Verbal

We report two new hydrophilic phenanthroline-based ligands developed for the separation of actinides from lanthanides in the i-SANEX process: one of bistriazolyl-phenanthroline (BTrzPhen) type incorporating sulfonated hydrophilic groups, and another of phenanthroline-dicarboxamide type named AE-DAPhen. Both ligands exhibit high solubility in aqueous nitric acid solutions. Among them,...

1209. Water-Soluble Phenanthroline Masking Agent for Selective Separation of Am(III) and Ln(III) by Competitive Extraction

Dr Ze-Yi Yan (兰州大学)

12/05/2026, 15:30

Separation Methods, Speciation

Verbal

The increasing demand of carbon-neutral and low-cost energy has caused nuclear energy as an essential element in the overall composition of the current global power supply. Accompanied by the high-speed development of nuclear energy, the environmental problems associated with used nuclear fuel have aroused great attention. The spent fuel produced by modern light water reactors, over 98.5% of...

1307. EBTzPhen: a new CHON-compliant ligand for the selective separation of Am(III) from Cm(III) and light lanthanides in the AmSel process

Giulia De Amicis (Politecnico di Milano, Dipartimento di Energia, P.zza L. da Vinci 32, 20133 Milano)

12/05/2026, 15:48

Separation Methods, Speciation

Verbal

The AmSel (Americium Selective) process has been developed for the selective separation of Am(III) from PUREX (Plutonium Uranium Reduction Extraction) raffinate. It is based on the combined use of two ligands: the lipophilic TODGA, which exhibits a slight selectivity towards Cm with respect to Am, and the hydrophilic SO₃-Ph-BTBP, which instead shows the inverse selectivity. The two...

1167. Anodic Electrodeposition for the Separation of Radionuclides of Transition Metals

Sebastian Siegrist (Paul Scherrer Institut)

12/05/2026, 16:06

Separation Methods, Speciation

Verbal

The precise identification and quantification of radionuclides is essential, for example, for monitoring emissions from nuclear installations, environmental radioactivity measurements and the decommissioning of nuclear facilities. As one of the main activation products in nuclear power plants (NPP), Co-60 complicates gamma-spectrometric analysis through the introduction of a pronounced Compton...

1155. Controlled Synthesis of Phosphonic Acid-Based Polymers and Their Adsorption Performance for Uranium(VI) in Strongly Acidic Environments

Zhineng Wu (Lanzhou University)

13/05/2026, 08:30

Separation Methods, Speciation

Verbal

The sustainable management of nuclear power necessitates advanced technologies for the efficient recovery of uranium(Ⅵ) from highly acidic radioactive waste streams (e.g., 4 M HNO3), a challenge exacerbated by the extreme acidity, which degrades the stability and efficacy of conventional adsorbents. This study presents a comprehensive and progressive materials development campaign aimed at...

1158. Study on preparation of boron nitride-based adsorbents and their adsorption performance for uranium and iodine

Peng Zhang (Lanzhou University)

13/05/2026, 08:52

Separation Methods, Speciation

Verbal

Efficient adsorption of uranium (U) and iodine (I) is crucial for sustainable development of nuclear industry and human health. In order to develop high-performance adsorbents for efficient U and I adsorption from complex environment, boron nitride with great chemical and radiological stability was selected as adsorbent matrix and a series of adsorbents were developed. In this work, active...

1176. Study on the Mechanism of Highly Selective Separation of Th(IV)/U(Ⅵ) Using COFs Designed for Precise Coordination Pockets

zengyuan li

13/05/2026, 09:14

Separation Methods, Speciation

Verbal

The alpha-radioactive alkaline effluent generated from the alkali washing course in the Purex Process represents a major challenge in downstream waste management. This necessitates the design of metal-organic frameworks (MOFs) or covalent organic frameworks (COFs) with tailored pore structures and functionalities for the highly selective capture of actinide ions under alkaline conditions....

1173. Integrated Spectro-Electrochemical Study of Technetium Redox Reactions and Ligand‑Dependent Speciation in Aqueous Media

Mario Löw (Helmholtz-Zentrum Dresden-Rossendorf)

13/05/2026, 09:36

Separation Methods, Speciation

Verbal

Technetium 99 is a long-lived fission product whose environmental mobility is controlled by redox transformations between the highly soluble Tc(VII)O4− anion and low valent Tc(IV) species that exhibit strong sorption or precipitation behavior. Understanding the formation, stability, and interconversion of these species in complex aqueous environments is essential for reliable safety...

1141. Inorganic Resin Materials for the Separation of Ra-223 and Ac-225

Esther Spruit (Tu Delft)

14/05/2026, 13:30

Separation Methods, Speciation

Verbal

Introduction
Due to the very promising properties of α-emitting radionuclides for cancer therapy, there is a high interest in α-emitters such as actinium-225. However, the poor availability of Ac-225 limits research, necessitating the development of new production routes. When using radium or thorium as target material, these new routes result in a highly active mixture of radionuclides from...

1156. Ti-based core-shell shaping for Ac-225/Bi-213 separation

Thomas Staes (SCK CEN)

14/05/2026, 13:48

Separation Methods, Speciation

Verbal

Cancer remains one of the leading causes of death worldwide, requiring innovative methods for its treatment such as targeted alpha therapy with Bi-213-based radiopharmaceuticals. Alpha radiation is especially promising as it enables maximum destruction of malignant cells while minimizing cytotoxicity on the surrounding healthy tissue. However, current challenges in separating the radioactive...

1154. The development of a separation method for ¹¹¹Ag from neutron‑irradiated Pd targets using dimethylglyoxime

Filippos Karantoumanis (Jožef Stefan Institute)

14/05/2026, 14:06

Separation Methods, Speciation

Verbal

Ag-111 is a radionuclide with prospective applications in the field of theranostics, i.e. the simultaneous imaging and treatment using a single radiopharmaceutical. It is a beta-decaying nuclide, with the emitted beta particles having suitable energies ($E_{β,mean}=$360 keV) for traversing only short distances within the tissues and interacting almost exclusively with cancer cells. Beta decay...

1222. Scrubbing of radium from a loaded organic phase in milliflow reactors: detection challenges and performance optimization for medical radioisotope purification by solvent extraction

Mr Samuele Servici (SCK CEN & KU Leuven)

14/05/2026, 14:24

Separation Methods, Speciation

Verbal

Objective and method

Actinium-225 (²²⁵Ac) is a promising radionuclide for targeted radionuclide therapy (TRNT), but current production methods cannot meet market demand. Innovative selective transmutation pathways have been researched to increase the market supply, particularly those exploiting the ²²⁶Ra photonuclear reaction. A novel solvent extraction...

1254. Extraction of radon from spring water into vegetable oils: Production of highly active preparations for medicinal purposes

Viktor Goliáš (Charles University in Prague, Faculty of Science, Department of Geochemistry, Mineralogy and Mineral ressources)

14/05/2026, 14:42

Separation Methods, Speciation

Verbal

The carcinogenicity of residential radon (222Rn) has long been scientifically discredited.
Positive correlation between radon and lung cancer is based on LNT (Linear-no-threshold-theory) only. No correlation here, when assumption-free statistics applied. On the other hand, radon is successfully used in balneology due to its strong hormetic effects.
In radon balneotherapy, in some cases, the...

1260. Spectroscopic Insights into Cm(III) Coordination with Unsymmetrically Substituted Diglycolamides

Thomas Sittel (Karlsruhe Institute of Technology (KIT))

15/05/2026, 10:30

Separation Methods, Speciation

Verbal

Diglycolamides (DGAs) are an important class of extractants due to their modular chemical structure which enables systematic tuning of steric and electronic properties. They are used in americium selective extraction processes such as the AmSel process to facilitate the separation of trivalent ions from spent nuclear fuel. The TODGA/SO$_3$-Ph-BTBP system, for example, allows selective...

1275. Innovative and sustainable TODGA-based solvents: redesigning the organic phase for SNF recycling

Massimiliano Federico Silvio Tentorio (Politecnico di Milano)

15/05/2026, 10:48

Separation Methods, Speciation

Verbal

Hydrometallurgical reprocessing of Spent Nuclear Fuel (SNF) relies on liquid–liquid extraction systems whose safety and sustainability are largely dictated by the organic diluent. While significant efforts have focused on ligand design, the diluent matrix remains a critical bottleneck due to toxicity concerns and incomplete compliance with the CHON principle. In recent years, research has...

1278. Assessment of TODGA degraded solvent in the AmSel process

Iván Sánchez-García (Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT))

15/05/2026, 11:06

Separation Methods, Speciation

Verbal

The reprocessing of spent nuclear fuel is currently moving towards advanced cycles that contemplate the recycling of minor actinides, in particular americium (Am), as a strategy to minimise the radiotoxicity of the waste that must be stored [1]. Most of the recycling strategies developed to achieve an advanced closed cycle use the PUREX raffinate as a starting point. In this context, the...

1234. Ab initio study of thermodynamic properties of ruthenium–nitrosyl system

LORIS GELIN

15/05/2026, 11:24

Separation Methods, Speciation

Verbal

For nuclear safety of spent fuel reprocessing plant, special attention must be paid to the volatile ruthenium species, particularly in case of the High-Level Liquid Waste (HLLW) storage tank accident scenario. The behavior of gaseous ruthenium therefore requires a detailed understanding of the successive stages of ruthenium volatilization and its chemical speciation, from liquid solutions up...

1237. Volatilization of Ru to RuO4 and liquid-liquid extraction methods for its recovery from spent nuclear fuel

Michael Seidel (FJFI ČVUT)

15/05/2026, 11:42

Separation Methods, Speciation

Verbal

Isolating ruthenium from spent nuclear fuel is essential both for reducing the environmental and technological burdens of high-level liquid waste management, particularly during vitrification, and for recovering a highly valuable platinum-group metal. Ruthenium poses a considerable challenge during its separation from spent nuclear fuel. That can be attributed to its high yield, wide range of...

1219. Reduction of ²²⁶Ra in Moroccan phosphogypsum using combined CaCl₂ treatment and acid leaching

Loubna El Faroudi (Green Energy Park (IRESEN, UM6P), Benguerir, Morocco)

Separation Methods, Speciation

Verbal

Phosphogypsum (PG), a by-product of phosphate fertilizer production, is generated in large quantities in Morocco and worldwide and is classified as a naturally occurring radioactive material (NORM). Moroccan phosphogypsum contains minor impurities such as residual phosphoric acid, heavy metals, and rare earth elements; however, the presence of radionuclides remains the principal barrier to its...