表面活性剂对空气-乙炔火焰原子吸收法测定铝的增感效应研究

Study of the Sensitizing Effects of Surfactants on the Determination of Aluminum by Air-Acetylene Flame Atomic Absorption Spectrometry

研究了溴化十六烷基三甲基胺、氯化十六烷基吡啶等10种表面活性剂对测定铝时的增感效应。结果表明,在实验所选择的表面活性剂中,阳离子表面活性剂对铝有明显增感作用,阴离子表面活性剂对铝有抑制作用,而特殊表面活性剂对铝没有作用。以溴化十六烷基三甲基胺（CTMAB）为增感剂,研究了空气-乙炔火焰原子吸收法测定铝镍合金样品中铝的工作条件、CTMAB用量、溶液介质和浓度及共存离子干扰的影响。测定铝的线性范围为0.10-2.0 g·L^-1,方法的相对标准偏差为2.6%,标准加入回收率在97%-103%之间。

The sensitizing effects of ten surfactants,such as cetyl trimethyl ammonium bromide（CTMAB） and cetyl pyridinium chloride（CPC）,on the determination of aluminum were studied.The results showed that the cationic surfactants in the experiment were good sensitizers for the determination of aluminum,and the sensitization time was about 3.0.On the other hand,anionic surfactants had inhibition action,while particular surfactants had no action.With the sensitizing agent of CTMAB,the operating parameters of the spectrometer and the effects of CTMAB,solution medium and interfering elements in aluminum-nickel alloy sample were studied.The content of aluminum in aluminum-nickel alloy sample was determined by air-acetylene flame atomic absorption spectrometry,the linear range of aluminum of this method was 0.10-2.0 g·L-1,the relative standard deviation was 2.6%,and the recoveries were in the range of 97%-103%.