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Quantitative and qualitative analysis of hydrosoluble organic matter in bitumen leachates

Abstract : Bitumen is currently used as an embedding matrix for low and intermediate level radioactive waste disposal in deep sediments. High impermeability and a great resistance to most chemicals are the two main properties sought. Indeed, the generation of water-soluble organic complexing agents could affect the integrity of the wasteform due to an increase of radionuclide solubility. Therefore, the aim of this study is the quantitative and qualitative characterisation of soluble organic matter in bitumen leachates. Different conditions of leaching solutions were tested such as various pHs, ionic strengths and S/V ratios), in order to simulate the expected deep environment of bitumen waste disposal. In water, at neutral pH, the amount of soluble organic matter released is very low. However, the amount of soluble total organic carbon released increased with pH. Nonetheless, in alkaline solutions (pH 13.5), the effect of the ionic strength leads to a decrease of soluble organic matter released. Several classes of organic compounds such as naphthalene, alcohols, linear carboxylic acids, aromatics, glycols, and nitrogen compounds were identified by GC-MS.
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Submitted on : Monday, January 1, 2001 - 10:00:00 AM
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Isabelle Walczak, Marie-Françoise Libert, Sylvie Camaro, Jean-Marie Blanchard. Quantitative and qualitative analysis of hydrosoluble organic matter in bitumen leachates. Agronomie, EDP Sciences, 2001, 21 (3), pp.247-257. ⟨10.1051/agro:2001121⟩. ⟨hal-00886113⟩



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