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在原子吸收分析中,火焰原子吸收法仍占主导地位。众所周知,常规火焰原子吸收法是采用气动喷雾进行原子化的,该法雾化效率通常为7～12％,再加之大量载气的稀释,到达火焰供原子吸收测定的原子也就相当稀薄了。另一方面,由于火焰燃烧速度很快,原子在火焰中的停留时间很短(10~(-3)秒),因与供测定的时间也就极为有限。如设计出一种原子化装置,它能达到以下几点要求之一,都能提高火焰原子吸收法的灵敏度:(1)能增加吸收光程的长度;(2)能减少载气的稀释;(3)能增加原子在火焰中停留的时间;(4)能使原子在火焰中
In atomic absorption analysis, flame atomic absorption method is still dominant. As we all know, the conventional flame atomic absorption method is the use of aerodynamic atomization atomization, the method atomization efficiency is usually 7 ~ 12%, together with a large number of carrier gas dilution, to reach the flame for atomic absorption determination of the atoms will be quite thin. On the other hand, due to the rapid burning rate of the flame, the residence time of the atom in the flame is very short (10-3 seconds), and the time for the measurement is very limited. Such as the design of an atomization device, which can achieve one of the following requirements, can improve the flame atomic absorption spectrometry sensitivity: (1) can increase the length of the absorption optical path; (2) can reduce the carrier gas dilution; (3) can increase the time the atom stays in the flame; and (4) make the atom in the flame