20151117-Survey injection self-suction buckle background graphite furnace atomic absorption spectrometry determination of copper, iron and sodium in high purity alumina -

Determination of Copper, Iron, and Sodium in High-Purity Alumina Using Graphite Furnace Atomic Absorption Spectrometry with Suspension Injection

This study presents a reliable and efficient method for determining trace amounts of copper, iron, and sodium in high-purity alumina using graphite furnace atomic absorption spectrometry (GFAAS) with suspension injection. The technique utilizes a self-priming background correction system, which enhances the accuracy and precision of the measurements by effectively reducing non-specific absorption. The experimental conditions, including ashing temperature, atomization temperature, and the operation parameters of the graphite furnace, were optimized to achieve the best analytical performance. A standard aqueous solution was used for calibration, and the accuracy of the method was validated using alumina AKP-30 samples dissolved under high-temperature and high-pressure conditions with concentrated sulfuric acid. The results were compared with those obtained from other established methods reported in the literature, confirming the reliability and applicability of this approach. The method demonstrated excellent linearity, with a correlation coefficient greater than 0.999, and low detection limits of 0.66 ng·g⁻¹ for copper, 2.5 ng·g⁻¹ for iron, and 0.13 ng·g⁻¹ for sodium. The relative standard deviation was below 5.2%, indicating good repeatability. High-purity alumina is a critical material in advanced ceramics, widely used in high-tech industries such as electrical insulation and integrated circuit substrates. Its properties—such as strength, thermal stability, and optical performance—are significantly influenced by trace impurities like Fe, Cu, and Na. Therefore, precise and rapid determination of these elements is essential for quality control and process optimization. Currently, traditional analytical methods for trace elements in high-purity alumina often involve complex sample preparation and carry risks of contamination. In contrast, the suspension injection technique offers advantages by avoiding complete digestion of the sample, thus preserving the integrity of the material while maintaining high sensitivity. This method is particularly suitable for analyzing solid samples that are difficult to dissolve. The self-priming background correction, also known as the Smith-Hieftje (S-H) method, is an effective way to reduce background interference during atomization. By applying alternating power to the hollow cathode lamp, it allows for accurate measurement even in complex matrices. In this work, we applied the self-priming background correction method in GFAAS to determine the trace element content in alumina through direct suspension injection. This approach provides a simple, accurate, and robust analytical tool for the characterization of high-purity materials. Keywords: Graphite furnace atomic absorption spectrometry; Self-priming background correction; Copper, iron, and sodium content in alumina; AA-1800.

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