抄録
A method for the quantitative determination of barium (Ba), magnesium (Mg), aluminium (Al), and europium (Eu) in the blue phosphor for fluorescent lamps was investigated by means of an alkaline fusion method, followed by inductively coupled plasma atomic emission spectrometry (ICP-AES). About 200 mg of samples were weighed in the Pt crucibles, 3.0 g of sodium carbonate (Na2CO3) and 1.0 g of sodium tetraborate (Na2B4O7•10H2O) added, followed by the fusion. After cooling, 10-20 ml of water and 20 ml of hydrochloric acid (1 : 1) was added. The contents heated on the hot plate were dissolved. After cooling, the solutions were adjusted with water to 250 ml. Ten milliliters aliquot of solutions were diluted with water to 100 ml, sample solutions measured by ICP-AES. Working standard solutions were prepared by addition the amount of Na2CO3, Na2B4O7•10H2O and hydrochloric acid (1 : 1) as same as sample. The four calibration curves obtained from the emission intensities were linear with high correlation coefficient of more than 0.999, respectively, and a good relative standard deviations (RSD, %) of 0.69(Ba15 μg ml-1), 0.66(Mg5.0 μg ml-1), 0.84(Al30 μg ml-1), and 0.47(Eu1.0 μg ml-1). This method was successfully applied to the determination of four elements in the experimental samples.
