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Direct solid sampling electrothermal atomic absorption spectrometry for the analysis of high-purity niobium
Fresenius' Journal of Analytical Chemistry
|February 28, 2001
Summary
A new direct solid sampling electrothermal atomic absorption spectrometry (SoS-ETAAS) method effectively analyzes ultratrace elements in niobium pentaoxide. Converting the matrix to niobium carbide overcomes interferences, achieving extremely low detection limits.
Area of Science:
- Analytical Chemistry
- Materials Science
Background:
- Niobium pentaoxide (Nb2O5) analysis presents challenges due to matrix interferences.
- Existing methods for ultratrace element determination in Nb2O5 are often complex or lack sensitivity.
Purpose of the Study:
- To develop a direct solid sampling electrothermal atomic absorption spectrometry (SoS-ETAAS) method for ultratrace elemental analysis of Nb2O5.
- To overcome matrix-induced interferences in the determination of specific elements.
Main Methods:
- Direct solid sampling electrothermal atomic absorption spectrometry (SoS-ETAAS).
- Matrix modification by converting Nb2O5 to niobium carbide using a methane atmosphere during pyrolysis.
- Quantification using calibration curves from aqueous standard solutions.
Main Results:
- Elements K, Mg, Na, and Zn determined without chemical modification.
- Conversion to niobium carbide successfully eliminated non-spectral interferences and background issues for Al, Co, Cr, Cu, Fe, Mn, and Ni.
- Achieved extremely low limits of detection (0.5-2 ng/g) due to minimal blank and high sample mass (up to 15 mg).
Conclusions:
- The developed SoS-ETAAS method with methane-assisted pyrolysis is a powerful tool for ultratrace analysis of Nb2O5.
- The method offers improved limits of detection, accuracy, simplicity, and reduced analysis time compared to conventional techniques.