Electrothermal atomic absorption determination of silicon in single crystals based on alkali metal halides

摘要

Conditions for determining silicon in cesium iodide and potassium chloride by atomic absorption spectrometry with electrothermal atomization were examined. The Measurements were performed using a Saturn spectrophotometer with a Grafit-2 atomizer. It was shown that the sensitivity of silicon determination is a maximum when graphite tubes are pretreated with a solution of zirconyl chloride and, an addition, ferric nitrate is added to the test solution as a matrix modifier. The tolerable concentrations of cesium iodide and potassium chloride in the test solution are 50 and 20 g/L, respectively. Procedures were developed for determining 3 X 10~(-5) mass % of silicon in cesium iodide and 2 X 10~(-4) mass % of silicon in potassium chloride.