Abstract：The determination of iron in iron ores (especially the ores which were hardly decomposed completely by conventional acid and base decomposition method) by iodometry was analyzed and studied. Total iron was determined using sodium peroxide alkali fusion method. Moreover, the traditional determination method of magnetic iron was modified. The effect of acidity, addition amount of potassium iodide and placing time on the determination results was investigated. The influence and elimination method of interference elements were studied. For the analysis of total iron in experiments, the addition amount of sodium peroxide was 3.0g. For the analysis of magnetic iron, the addition amount of hydrogen peroxide solution (300g/L) was one drop. The initial acidity was controlled at 0.5-1.0mol/L for the analysis of total iron and magnetic iron. The pH was controlled at about 3.0-4.0 near the endpoint of reaction. The addition amount of potassium iodide solution (250g/L) was 10mL. The interference elements were successfully separated. The content of total iron and magnetic iron in certified reference materials and actual samples of iron ore with different types and contents were determined using the experimental method and traditional potassium dichromate mercury-free titration for comparison. The found results of experimental method were basically consistent with the certified values or those obtained by potassium dichromate mercury-free titration method. The relative standard deviations (RSD) of determination results of total iron and magnetic iron were 0.076%-0.19% and 0.083%-0.13%, respectively. Both correctness and precision could meet the requirements of quality management standard in DZ/T 0130-2006.
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