Abstract：The sample was fused in high frequency fusion machine at 1 050 ℃ for 4 min using lithium metaborate as flux, lithium bromide as releasing agent and lithium nitrate as oxidizing agent. After acidification and extraction with nitric acid, the solution was diluted to the mark. The influence of matrix effect was eliminated by preparing calibration curves using matrix matching method. The high salt nebulizer injection was adopted for the direct determination of phosphorus pentoxide, magnesium oxide, iron oxide, aluminum oxide, silicon dioxide, calcium oxide, potassium oxide, sodium oxide, titanium dioxide, manganese oxide, strontium oxide and total sulfur in phosphate ores by inductively coupled plasma atomic emission spectrometry (ICP-AES). The conditional tests were conducted, including the dilution ratio between flux and sample, selection of releasing agent, selection of oxidizing agent, sample fusion temperature, sample fusion time, pH and stability of solution. The optimal experiment conditions were obtained. The detection limits of method were between 0.000 2 μg/g and 0.025 8 μg/g. The content of phosphorus pentoxide, magnesium oxide, iron oxide, aluminum oxide, silicon dioxide, calcium oxide, potassium oxide, sodium oxide, titanium dioxide, manganese oxide, strontium oxide and total sulfur in phosphate ore sample was determined according to the experimental method. The relative standard deviations (RSD, n=11) were between 0.48% and 1.3%. The content of phosphorus pentoxide, magnesium oxide, iron oxide, aluminum oxide, silicon dioxide, calcium oxide, potassium oxide, sodium oxide, titanium dioxide, manganese oxide, strontium oxide and total sulfur in three certified reference materials (GBW 07210, GBW 07211 and GBW 07212) was determined according to the experimental method. The found results were consistent with the certified values (or those obtained by national standard method GB/T 1880—1995).
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