کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1240055 | 1495694 | 2015 | 8 صفحه PDF | دانلود رایگان |
• We optimized and compared two hydride atomizers for atomic fluorescence spectrometry.
• Miniature diffusion flame and flame-in-gas-shield atomizer were optimized.
• The limit of detection for arsenic was 1.0 ng l− 1.
A detailed optimization of relevant experimental parameters of two hydride atomizers for atomic fluorescence spectrometry: flame-in-gas-shield atomizer with a two-channel shielding unit and a standard atomizer for atomic fluorescence spectrometry, miniature diffusion flame, was performed. Arsine, generated by the reaction with NaBH4 in a flow injection arrangement, was chosen as the model hydride. Analytical characteristics of both the atomizers (sensitivity, noise, limits of detection) were compared. Under optimum conditions sensitivity obtained with flame-in-gas-shield atomizer was approximately twice higher than with miniature diffusion flame. The additional advantage of flame-in-gas-shield atomizer is significantly lower flame emission resulting in a better signal to noise ratio. The resulting arsenic limits of detection for miniature diffusion flame and flame-in-gas-shield atomizer were 3.8 ng l− 1 and 1.0 ng l− 1, respectively.
Journal: Spectrochimica Acta Part B: Atomic Spectroscopy - Volume 109, 1 July 2015, Pages 16–23