Determination of four additives in aluminum electrolyte by ICP-OES with wet digestion

A method to quantify K, Ca, Mg and Li in aluminum electrolyte by ICP-OES with wet digestion was developed. The samples were digested using aqua regia in PTFE beakers and heated by electric hot plate. The levels of four additives, namely KF, CaF₂, MgF₂ and LiF in aluminum electrolyte were determined simultaneously by ICP-OES. The recovery rate of this method was 93.27%–103.51%. Accuracy was also proven through the measurement of standard sample of aluminum electrolyte. The developed method was applied to relative standard deviations for three digestion replicates of ten samples were in the range from 0.51% to 8.33%.