STUDY ON THE RADIONUCLIDE ELUTION FROM QUARTZ SAND SOURCE AND THEIR SPECIATION

The study of the elution of the radionuclide from quartz sand source and their speciation is carried out by column method. The colloid form of nuclides in the eluted solution is studied by ultra-filtration method. The existing form of the nuclides on the sand after elution is studied with sequential extraction method. When the volume of eluted solution is up to 110 times of the column volume, the nuclide 237Np of more than 90% is eluted, and in the exchangeable form. The nuclide 237Np remained in the sand is mainly in the form of being coincident with the matrix of carbonate(5.5%) and the transition metals, iron and manganese( 1.3%). The elution of 238Pu from sand is more difficult than that of 237Np. 238Pu may exist in colloid form in eluted solution.