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本文探索了用富氧空气乙炔火焰原子吸收光谱法测定铝的可能性。比较了乙炔流量、空气压力,以及氧气流量与氧—乙炔比的影响。当富氧空气中含氧量为45—46％、氧—乙炔比为0.58时具有较高的灵敏度,且吸光度与乙炔流量成正比,当乙炔流量为4.17L/min时,其特征浓度为2.5μg/ml。并比较了不同有机试剂在此火焰中对铝的增感效应,观察到当有机试剂的结构在苯环的邻位均含有羟基及羧基的铝分析功能团,如铝试剂、铬天青S、磺基水杨酸、钛铁试剂及邻苯二甲酸氢钾等,均具有相似的及最大的增感效应,其增感倍数约为1.0,特征浓度可达1.2μg/ml。方法具有操作简单、耗气量小,火焰稳定、灵敏度高及不易回火等特点。
This article explored the possibility of determining aluminum with oxygen-enriched air acetylene flame atomic absorption spectrometry. The effects of acetylene flow rate, air pressure, oxygen flow ratio and oxyacetylene ratio were compared. When oxygen-enriched air has oxygen content of 45-46% and oxygen-acetylene ratio is 0.58, it has higher sensitivity and absorbance is proportional to acetylene flow rate. When acetylene flow rate is 4.17L / min, its characteristic concentration is 2.5 μg / ml. The effect of different organic reagents on the sensitization of aluminum in this flame was also compared. It was observed that when the structure of the organic reagent has both hydroxyl and carboxyl groups in the ortho-position of the benzene ring, such as aluminum reagent, chrome azure S, Sulfosalicylic acid, ferrotitanium reagent and potassium hydrogen phthalate all have similar and maximum sensitization effects, the sensitization factor is about 1.0 and the characteristic concentration is up to 1.2μg / ml. The method has the advantages of simple operation, small air consumption, stable flame, high sensitivity and no easy tempering.