New Possibility for REE Determination in Oil

Table 5

Measured REE concentration in Tengizskaya, West Siberian, and composite oils by ICP-MS after CCC preconcentration.

Element	Concentration in oils, μg/kg
	Tengizskaya	West Siberian	Composite
Y	𝟎.𝟎𝟏𝟗±0.004	𝟎.𝟎𝟎𝟕±0.001	𝟎.𝟎𝟏𝟐±0.002
La	𝟎.𝟏𝟑𝟑±0.023	𝟎.𝟐𝟎𝟖±0.036	𝟎.𝟎𝟑𝟕±0.004
Ce	𝟎.𝟎𝟔±0.01	𝟎.𝟎𝟏𝟐±0.002	𝟎.𝟎𝟎𝟒𝟎±8𝐸−4
Pr	𝟎.𝟎𝟎𝟔±0.001	𝟎.𝟎𝟎𝟐𝟎±4𝐸−4	𝟎.𝟎𝟎𝟐𝟎±4𝐸−4
Nd	<0.001	𝟎.𝟎𝟎𝟕±0.002	𝟎.𝟎𝟎𝟑𝟎±6E−4
Sm	𝟎.𝟎𝟎𝟔±0.001	𝟎.𝟎𝟎𝟐𝟎±4𝐸−4	𝟎.𝟎𝟎𝟐𝟎±4𝐸−4
Eu	𝟎.𝟎𝟏𝟖±0.004	𝟎.𝟎𝟎𝟐𝟎±4𝐸−4	𝟎.𝟎𝟎𝟎𝟒±1𝐸−4
Gd	𝟎.𝟎𝟏𝟏±0.003	<0.0002	𝟎.𝟎𝟎𝟎𝟒±1E−4
Tb	𝟎.𝟎𝟎𝟐𝟎±4𝐸−4	𝟎.𝟎𝟎𝟑𝟎±6𝐸−4	𝟎.𝟎𝟎𝟎𝟐±5𝐸−5
Dy	𝟎.𝟎𝟎𝟑𝟎±6𝐸−4	𝟎.𝟎𝟎𝟏𝟎±2𝐸−4	𝟎.𝟎𝟎𝟎𝟓±1𝐸−4
Ho	𝟎.𝟎𝟎𝟏𝟎±2𝐸-4	𝟎.𝟎𝟎𝟏𝟎±2𝐸−4	𝟎.𝟎𝟎𝟎𝟑±1𝐸−5
Er	𝟎.𝟎𝟎𝟐𝟎±4𝐸−4	𝟎.𝟎𝟎𝟏𝟎±2𝐸−4	𝟎.𝟎𝟎𝟎𝟐±1𝐸−5
Yb	𝟎.𝟎𝟎𝟓±0.001	𝟎.𝟎𝟎𝟏𝟎±2𝐸−4	𝟎.𝟎𝟎𝟎𝟓±1𝐸−4
Lu	<0.0005	<0.0005	<0.0005