Determination of rare earth elements in crude oil by ICP-MS

摘要

Sc, Y. La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu Rare Earth Elements in crude oil were determined by ICP-MS. The oil sample was treated with high-pressure digestion. The digestion degree of the crude oil was monitored by determining the intensity of C element at 193.027 nm by ICP, which solved the problem of equipment damage and pollution or result deviations caused by incomplete digestion. The polyatomic ion effect was eliminated by collision cell technique and the matrix effect was compensated by selecting suitable elements as the internal standard elements for the determination. The results showed that the detection limits were 0.01 μg/kg -0.7 μg/kg, and values of recovery were in the ranges of 80.4%%~105.2%. The method was suitable for determining the trace rare earth elements in crude oil with the features of low detection limit, rapid determination and convenience.