New Possibility for REE Determination in Oil

Table 6

Comparative REE ratios of Tengizskaya, West Siberian, and composite oils obtained by ICP-MS after CCC preconcentration.

Oil	Elements ratios
	La/Ce	Nd/Sm	Eu/Gd	Dy/Ho
Tengizskaya	2.1	—	1.8	3.0
West Siberian	17	3.5	—	1.0
composite	9.3	1.5	1.0	1.7