Abstract：Much titanium is easily hydrolyzed during the decomposition of titanium dioxide to form fine precipitates. Even through filtration over and over again, a few fine precipitate particles are still residual in filtrate, which will influence the determination of phosphorus by spectrophotometry. In order to solve this problem, the titanium dioxide sample was fused with mixed flux of anhydrous sodium carbonate and boric acid, and the melted sample was dissolved with sulfuric acid medium at low temperature. In sulfuric acid medium, phosphorus was oxidized to orthophosphate for existing in solution by potassium permanganate, and sodium hydroxide was then added to react with matrix titanium to form sodium trititanate precipitate, realizing the separation of phosphorus with titanium by filtration. Consequently, a determination method of phosphorus in titanium dioxide was established by phosphomolybdate bismuth blue spectrophotometry. Under the optimized experimental conditions, the mass concentration of phosphorus in range of 0.009-0.382 μg/mL and the corresponding absorbance obeyed to Beer’s law. The correlation coefficient of calibration curve was 0.999 9. The titanium dioxide sample was determined parallelly according to the experimental method for eight times. The relative standard deviation(RSD, n=8) was less than 4.0%. The recoveries were between 98% and 103%. The comparison tested was conducted with microwave digestion-inductively coupled plasma mass spectrometry (ICP-MS). The results indicated that the results of the two methods were basically consistent.
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