Selective separation of cesium by crown ethers and method of 135Cs assay using this separation mode.

摘要

The invention relates to a process for the selective separation of cesium using a crown ether and sodium tetraphenylborate. BR/ According to this process, the cesium is separated by means of an immiscible phase comprising the crown ether tBB21C7 and sodium tetraphenylborate. The cesium can then be re-extracted in 0.01 to 5N nitric acid. BR/ This method can be used for the determination of 1 3 5 Cs in aqueous solutions resulting from the reprocessing of spent nuclear fuels.