间接火焰原子吸收法测定水中铝的含量

Determination of Aluminum in Water by Indirect Air-Acetylene Flame Atomic Absorption Spectrometry

采用普通的空气-乙炔直接火焰原子吸收法较难测定水中的铝含量,因铝在该火焰中形成耐高温铝化合物致难以分析。本文采用的间接火焰原子吸收法是利用铜络合物置换反应,使用空气-乙炔火焰间接测定了难于原子化的铝元素含量,在分离干扰物质后实验效果优良,且仪器设备投资和运转成本较低。本文初步探讨了酸度、萃取剂、加热温度、加热时间和静置时间以及仪器参数对间接火焰原子吸收法测定水中铝的影响,并进行了干扰实验、检出限、精密度和加标回收试验,最终结果满足地表水监测需求。

It is difficult to determine the aluminum content in water by ordinary air acetylene direct flame atomic absorption spectrometry. Indirect flame atomic absorption spectrometry used in this paper is through copper complex replacement reaction, using air acetylene flame indirectly determines the aluminum content difficult for atomization with excellent experiment effect after separating interference material and low cost for equipment investment and operation. This paper discusses the acidity, solvent, heating temperature, heating time and the static time and instrument parameters effect on the determination of aluminum in water by indirect flame atomic absorption spectrometry, and the interference experiment, detection limit, precision and recovery test, the final results of which meet the requirements of surface water monitoring.