Properties and suitability of liquid electrode plasma optical emission spectrometry (LEP-OES) for the determination of potassium, lithium, iron, and zinc in aqueous sample solutions

The effects of different parameters and the nitric acid concentration on sensitivity repeatability elemental analysis were characterized for liquid electrode plasma optical emission spectrometry (LEP-OES). In addition, internal standardization LEP-OES was investigated. developed method used determination lithium, potassium, iron, zinc in aqueous solutions samples with high concentrations after microwave-assisted digestion. results compared those obtained by inductively coupled – spectrometry. improved when optimized. some improvement accuracy reproducibility achieved gold employed. However, due to strong matrix effects, calibration standards should be made as similar possible sample matrix.