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In the context of radioactive waste disposal, Boom Clay (BC) is considered as one of the potential host rock formations for the storage of high-level and long-lived (HLW-LL) radioactive waste in Belgium. Boom Clay was deposited in seawater approximately 30 million years ago and is mainly composed of siliciclastic minerals, carbonates and organic matter. Significant part of the BC organic matter (up to 250 mg C/L) occurs in dissolved form, meaning it passes – by definition a 0.45 μm filter. This dissolved organic matter (DOM) differs in size (from hundreds to thousands of Da, Fig. 1), solubility at different pHvalues (humic and fulvic acids), structure (aliphatic versus aromatic) and reactivity (functional groups). Previous studies [1] showed that DOM can form complexes with uranium and thus, influence the geochemical behavior of uranium, however the complex structure of natural DOM was not taken into account so far.

How does the complex structure and size of Boom Clay natural dissolved organic matter affect its reactivity towards radionuclides?