[Detection of Sulfur Dioxide in Preserved Fruits with High Resolution Continuum Source Atomic Absorption Spectrometry...

The CS diatomic molecules can be transformed from sulfur in fuel-rich air acetylene flame. The absorbance of CS can be detected with atomic absorption spectrometry as the CS line profile is similar to the atomic absorption. A novel method was established to detect the sulfur dioxide in preserved fruits with high resolution continuum source atomic absorption spectrometry. The sulfate ions can be transformed from the SO2 in preserved fruits after the experience of acidity, distillation and oxidation with H2O2.The instrumental parameters influencing on the sensitivity of SO2 determination were optimized, including the velocity of acetylene, the flame height, etc. And the interference of different S species, such as SO2-4, S2O2-3, etc on the SO2 recovery was observed. In the optimal conditions, the limit of detection under the wavelength of 257.961 nm was 52.4 mg·kg-1, and the relative standard deviation was below 10%. The average spiked recoveries between 85.7% and 115.7% were achieved when this method was used for real preserved fruits samples analysis. It’s proved that this method has the merits of high accuracy rapid analysis and low interference, and the application areas of atomic absorption spectrometry were extended.