Analytical Study on Determination of Lanthanum,Cerium,and Yttrium in Rare Earth Reinforced Black Titanium Dioxide by ICP-AES
An inductively coupled plasma atomic emission spectrometry method for the determination of La,Ce and Y in rare earth reinforced black titanium dioxide was established by using HF-HNO3 mixed acid as dissolution reagent and Y:360.073 nm,La:408.672 nm and Ce:413.380 nm as analysis lines.Through a series of experiments,the influences of sample dissolution condition,matrix effect,coexisted elements and analytical spectrum lines on the determination of measured elements were discussed.The results indicated that the matrix titanium has an effect on de-termination when the concentration of the determination element in the sample solution is lower than 5.0 mg/L,and the effect should be eliminated by matrix matching.The interference experiments of coexisted elements indicated that they did not interfere with each other when the concentration of each coexisted element is is below 200 mg/L.The detection limits of each element were La:0.0009%,Ce:0.0013%,Y:0.0004% .The recoveries were 97.8%～102.6%,and the coefficient of variation CV were 0.56%～3.19% .This method is used for the determination of rare earth ele-ments in rare earth reinforced black titanium dioxide,and the measurement results are basically consistent with the theoretical values,and the measurement results are accurate and reliable.
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