Abstract：The industrial silicon sample was dissolved with hydrofluoric acid and nitric acid. After removing silicon and fluorine by perchloric acid fuming, ascorbic acid and the color developing solution were added successively for coloring followed by direct determination. Thus, an analysis method of phosphorus content (0.001%-0.27%) in industrial silicon by phosphomolybdenum blue spectrophotometry was established. The results showed that Beer’s law was obeyed for mass concentration of phosphorus in range of 0.05-1.40 μg/ mL. The detection limit of method was 0.000 46 μg/mL. The apparent molar absorptivity was ε825=2.75×104 L·mol－1·cm－1. Other coexisting ions in sample had no interference. The content of phosphorus in three industrial silicon industry reference materials was determined according to the experimental method in different laboratories, and the results were consistent with the certified values. The content of phosphorus in two industrial silicon industry reference materials was determined according to the experimental method, and the results were both consistent with those obtained by national standard methods GB/T 14819.4-2012 and GB/T 14819.5-2012. The proposed method was applied to the determination of phosphorus (0.001%-0.27%) in industry reference materials and actual samples of industrial silicon. The relative standard deviations (RSD, n=22) were between 1.4% and 4.5%.
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