Determination of Strontium in High Barium Optical Glass by Inductively Coupled Plasma Atomic Emission Spectrometry

0.100 0 g of the sample and 0.500 0 g of ammonium hydrogen fluoride powder were placed into a closed digestion tank, and few drops of water were added to wet. The mixture was digested at 200℃ for 2.0 h in 10 mL of hydrochloric acid, 5 mL of nitric acid and 2 mL of perchloric acid, and then evaporated to near dryness at 200℃ after cooling. The residue was extracted in 5 mL of nitric acid for 6-8 min, and the volume was made up to 100 mL with water. Strontium in the solution was determined by inductively coupled plasma atomic emission spectrometry under the analytical spectral line of 460.733 nm. The background was corrected by two-point correction method, and the working curve was drawn with the standard solution series matched with the matrix. As shown by the results, linear relationship between the mass concentration of strontium and the corresponding response intensity was found in the range of 0.50-20.00 mg·L^-1, with detection limit (3s) of 5 μg·g^-1. Strontium in a sample was determined 12 times, with RSD of the determined values of 2.5%. Test for recovery by the standard addition method was made on the actual sample, giving results of 98.0% and 101%, respectively.