Abstract：The establishment of method for determination of arsenic in chromium ore is of great significance to improve the detection method and quality evaluation approach of chromium ore. 2 g of sodium peroxide was added into 0.5 g of chromium ore sample, and the mixture was fused at 650 ℃ for 20 min. The melt was acidified and dissolved with hydrochloric acid. A method for the determination of arsenic in chromium ore by hydride generation-atomic fluorescence spectrometry (HG-AFS) was established using 10% hydrochloric acid as the carrier and 15 g/L potassium borohydride as the reducing agent. The experiments showed that the mass concentration of arsenic in range of 0.025-100 μg/L had linear relationship with the corresponding fluorescence intensity. The correlation coefficient was 1.000 0. The limit of detection was 0.05 μg/g, and the limit of quantification was 0.17 μg/g. The composition statistics of 2 649 chromium ore samples from 19 countries including South Africa, Turkey and Pakistan were conducted. It was found that the main elements in chromium ore were chromium, iron, magnesium, aluminum and silicon. The interference tests indicated that the coexisting elements in samples had no interference with the determination. Three chromium ore samples with different contents of arsenic were used for precision and standard addition recovery tests according to the experimental method. The relative standard deviation (RSD, n=11) of determination results were between 1.4% and 6.0%. The recoveries were between 96% and 109%. The proposed method was applied for the determination of arsenic in certified reference materials of iron ore with similar matrix to the chromium ore, and the found results were basically consistent with the certified values.
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