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联合应用几种改善火焰原子吸收分析性能的技术可显著地改善火焰原子吸收的灵敏度和检出限,我们称这种方法为微量火焰原子吸收技术。提出了微量火焰原子吸收技术的理论模式。以矿石及其加工产品中微量金的测定和水中铅与砷的测定为例,详细地讨论了微量火焰原子吸收技术的应用效果。联合应用高效雾化器、高性能空心阴极灯、石英缝管和流动注射在线富集的系统,使测定微量金的信噪比改善950倍,检测限达到0.2ng/ml(3σ),可以测定矿石及其加工产品中0.005g/t以上的金。联合应用高效雾化器、高性能空心阴极灯和石英缝管的系统,使测定铅的信噪比改善67倍,检测限达1.6ng/mL(3σ),可以直接测定水体中ng/ml级的铅。采用联合应用高性能空心阴极灯、石英缝管和HG-3简易氢化物发生器的系统,使测定砷的信噪比改善了430倍,检出限达3.0ng/ml(3α),可以直接测定水体中ng/ml级的砷。
The combination of several techniques for improving flame atomic absorption spectrometry can significantly improve the flame atomic absorption sensitivity and the detection limit, which we call the trace flame atomic absorption technique. A theoretical model of flame atomic absorption spectrometry was proposed. Taking the determination of trace gold in ore and its processed products and the determination of lead and arsenic in water, the application effects of trace flame atomic absorption spectrometry are discussed in detail. The combination of high efficiency nebulizer, high performance hollow cathode lamp, quartz slit tube and flow injection on-line enrichment system can improve the signal-to-noise ratio of micropore by 950 times and the detection limit to 0.2ng / ml (3σ) Ore and its processing products in more than 0.005g / t gold. The combination of high efficiency nebulizer, high performance hollow cathode lamp and quartz slit tube system can improve the signal-to-noise ratio of lead by 67 times and the detection limit of 1.6ng / mL (3σ), which can directly determine the ng / ml level Lead. The combination of high-performance hollow cathode lamp, quartz slit tube and HG-3 simple hydride generator system improved the signal-to-noise ratio of arsenic by 430-fold and the detection limit of 3.0 ng / ml (3α) Determination of ng / ml arsenic in water.