Abstract：The sample was decomposed by sodium peroxide fusion method. The matrix, chromium and silicon were separated by precipitation under strongly alkaline conditions. Then, the pH of solution was controlled to 6-7 to precipitate and separate interference elements (such as iron, aluminum and titanium) by hexamethylenetetramine and copper reagent. The calcium (in calcium oxide) and magnesium (in magnesium oxide) in filtrate were titrated using EDTA standard titration solution with two different concentrations. The determination method of calcium and magnesium in chromite was established. The content of calcium in filtrate after separating chromium by precipitation method was determined by inductively coupled plasma atomic emission spectrometry. The results showed that the content of calcium in filtrate could be ignored compared with the content of calcium in sample. The interference test indicated that the coexisting elements in sample did not interfere with the determination. The calcium and magnesium in GTK-1 chromite sample, GBW 07820GCr-3 chromite standard substance and GSBD 33001-94 chromite standard substance were determined according to the experimental method. The found results were consistent with the certified values. The relative standard deviations (RSD, n=8) were between 0.25% and 4.9%. The range of method was allowable according to the specification in GB/T 24221-2009.
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