Determination of Tin in Copper-Tin Alloy by AA-1800 Atomic Absorption Spectrometry
Key words: atomic absorption spectrometer; tin in copper-tin alloy; aesthetic analyzer; AA1800C Abstract: This study presents a method for determining the tin content in copper-tin alloys using flame atomic absorption spectrometry (FAAS). The sample was prepared using a wet digestion method with nitric acid, and the resulting solution was analyzed on an AA-1800 atomic absorption spectrophotometer. The results were compared to those obtained from the UV-Vis spectrophotometric method specified in GB/T 5121.10-2008. It was found that both methods yielded consistent results, but the FAAS method is simpler, faster, and uses fewer reagents. Copper-tin alloys are widely used in various industrial applications, such as shipbuilding, chemical processing, machinery, and instrumentation. They are particularly suitable for manufacturing components that require corrosion resistance, wear resistance, and magnetic properties, such as bearings, springs, and pump parts. The tin content directly influences the mechanical properties and microstructure of the alloy, making accurate determination essential for quality control during production. In this experiment, the AA-1800 atomic absorption spectrometer was used with a tin hollow cathode lamp. The operating conditions included a wavelength of 286.6 nm, a current of 7 mA, a slit width of 0.2 nm, and a burner height of 10 mm. Standard solutions of tin were prepared, and the standard addition method was employed to construct a calibration curve. The sample solution was measured three times, and the average absorbance value was used to calculate the tin concentration. The results showed that the FAAS method provided reliable and reproducible data, effectively eliminating matrix interference through the standard addition technique. Compared to traditional UV-Vis methods, the FAAS approach reduces the need for complex pretreatment and colorimetric reactions, making it more efficient and cost-effective. This method is recommended for laboratories seeking a fast, accurate, and environmentally friendly way to analyze tin in copper-tin alloys. Key words: atomic absorption spectrometer; tin in copper-tin alloy; aesthetic analyzer; AA1800C
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