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火焰原子化法在原子吸收分析中,利用火焰使试样转化成自由原子,是一种简便、稳定的方法。通过空气-乙炔和一氧化二氮-乙炔两种火焰,可以实现大多数元素的原子吸收测定。分析的相对标准偏差一般为0.4～2%,最佳可达0.2%。目前火焰原子化法仍然是原子吸收光谱分析中主要的原子化法。火焰的结构和温度预混合火焰的结构如图1所示。燃气和助燃气在雾化室中混合后,从燃烧器的缝口喷出,进入火焰预热区,此区的温度不高,试样在这里被干燥,呈固态微粒;包围着预热区的是第一反应区,燃气和助燃气在这里
Flame Atomization In the atomic absorption analysis, the use of flame to make the sample into free atoms, is a simple and stable method. Through the air - acetylene and nitrous oxide - acetylene flame, can achieve most elements of the atomic absorption determination. Analysis of the relative standard deviation of 0.4 to 2%, the best up to 0.2%. Flame atomization is still the main atomization method in atomic absorption spectrometry. Structure and temperature of the flame Pre-mixed flame structure shown in Figure 1. After the gas and the auxiliary gas are mixed in the atomization chamber, they are ejected from the slit of the burner into the flame preheating zone. The temperature in this zone is not high. The sample is dried here and is in the form of solid particles. The first reaction zone, gas and co-gas here