摘要
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。
The possibility for determination of Al using mixed oxygen air-acetylene flame AAS has been studied and the effects of the acetylene flows, air pressures, oxygen flows and ratio of O_2/C_2H_2 on the absorbance have been compared. When the amount of oxygen is 45～46% in mixed gas and the ratio of O_2/C_2H_2 is about 0.58, it was observed that higher sensitivity would be given and the absorbance was direetly proportional to the acetylene flows. If acetylene flow was 4.17L/min, the characteiistic concentraction was 2.5μg/ml. In addition, the enhancement effect caused by adding various organic reagents has been investigated. it was observed that the reagents containing such functional groups as hydroxy-and/or carboxy-in ortho-position of benzene ring e.g. Aluminon, CAS, sulfosalicylic acid and potassium acid phthalate, had similar and maximal enhancement effect. The sensitivity increased by 100% and characteristic concentraction could reach 1.2gμg/ml. This method is simple with a stable flame, a low consumption of fuel gas and a high sensitivity, and is hardly in fire-back. It is a safe flame for determination of Al fn AAS.
出处
《分析化学》
SCIE
EI
CAS
CSCD
北大核心
1990年第1期72-74,共3页
Chinese Journal of Analytical Chemistry
关键词
铝
富氧空气
乙炔火焰
AAS法
Atomic absorption spectrometry
Oxygen-air-acetylene flame
Aluminium
