Microanalysis for Flame Atomic Absorption Spectroscopy in Determination of High Content Sodium

A new method using Flame Atomic Absorption Spectroscopy (FAAS) and Microanalysis to determine high content sodium is developed. The developed method involves the choosing of suitable absorption line of sodium, the optimization of testing parameters and the evaluation of the linearity of the method. The linearity is 0~5mg/L, the detection limit is 0.02mg/L and the repeatability is 0.5% RSD. By comparing the measured sodium content with its truth value in some known organic and inorganic compounds, the absolute error is less than 0.3%, the relative error is less than 1%, and the recovery is 99.2%~100.6%.