Des solutions plus ou moins riches en complexes nitro ont été préparées en trai tant une solution de mononitrato nitrosyl-ruthénium sans entraîneur avec des oxydes d'azote. Ces solutions ont été diluées dans des eaux de mer simulées, tamponnées à pH 8,4, la concentration finale en ruthénium étant environ 10-9 M.L'évolution dans le temps des complexes nitro a été comparée à celle des com plexes nitrato en utilisant leurs propriétés d'ultrafiltration et de sorption comme indice de leur état physico-chimique. Certains complexes nitro restent à l'état soluble et sont très peu retenus par les sorbants argileux, Les complexes nitrato se transforment en espèces colloïdales rapidement adsorbées par toute particule solide en suspension. Ces observations peuvent servir de point de départ à des études ultérieures sur le comportement chimique et radioécologique du nitrosyl-ruthénium marin. ABSTRACTSolutions more or less enriched in nitro complexes have been produced by treating a solution of the nitrosyl mononitrate of carrier-free ruthenium 106 with oxides of nitrogen. These solutions have been diluted with simulated seawaters buffered at pH 8.4 the final ruthenium concentration being about 10-9 M. The evolution of nitro complexes has been compared with that of nitrato complexes using their ultrafiltration and sorption properties as an indication of their physico-chemical form. Some nitro complexes are soluble and poorly retained by argillaceous sorbents, in contrast to the nitrato complexes producing colloïdal species and being easily adsorbed by any solid suspended matter. These observations may guide further studies on the chemical and radioecological behaviour of the marine nitrosyl-ruthenium. * Département de la Protection Sanitaire, Centre d'Etudes Nucléaires de Fontenay-aux-Roses, B.P. 6, 92-Fontenay-aux-Roses.
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