Determination of Rare Earth Impurities in High Purity Zirconium Dioxide by Electrothermal Vaporization Inductively Coupled Plasma Atomic Emission Spectrometry Using 1-Phenyl-3-Methyl-4-Benzoyl-5-Pyrazone as Extractant and Chemical Modifier

ABSTRACT

A novel method has been developed for the determination of trace La, Eu and Y in high purity ZrO₂ by electrothermal vaporization inductively coupled plasma atomic emission spectrometry (ETV-ICP-AES) with 1-phenyl-3-methyl-4-benzoyl-5-pyrazone (PMBP) as extractant and chemical modifier. The matrix was quantitatively separated from the selected elements in 6M HNO₃ medium by extraction with 0.1M PMBP in chloroform. The vaporization behaviors, effect factors and analytical characteristics of above selected elements were investigated in detail. Under the optimized conditions, the detection limits were 8.0, 0.9 and 1.0ng ml⁻¹ for La, Eu and Y with the relative standard deviations of 3.3, 3.4 and 4.0% (n=7, c=0.5 μg ml⁻¹), respectively. The proposed method has been applied to determine trace impurities in ZrO₂.

Keywords::

• Electrothermal vaporization
• inductively coupled plasma atomic emission spectrometry
• high purity zirconium dioxide
• rare earth element
• rare earth–PMBP chelate