New Possibility for REE Determination in Oil

<table class="table-group" id="tab7"><tr><td><table class="table"><tr><td class="thead-hr" colspan="5"><hr/></td></tr><tr><td align="left" rowspan="2">Method</td><td align="center" colspan="4">Elements ratios</td></tr><tr><td align="center">La/Ce</td><td align="center">Nd/Sm</td><td align="center">Eu/Gd</td><td align="center">Dy/Ho</td></tr><tr><td align="left" colspan="5"><hr/></td></tr><tr><td align="left">NAA</td><td align="center"><b>1.8</b></td><td align="center"><b>4.2</b></td><td align="center"><b>1.6</b></td><td align="center"><b>3.0</b></td></tr><tr><td align="left">ICP-MS</td><td align="center"><b>2.1</b></td><td align="center">—</td><td align="center"><b>1.8</b></td><td align="center"><b>3.0</b></td></tr><tr class="table-tr"><td colspan="5"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

Comparative REE ratios of Tengizskaya oil obtained by ICP-MS after CCC preconcentration and by NAA.

International Journal of Spectroscopy

New Possibility for REE Determination in Oil

Table 7