The factors impacting the uncertainty in the measurement results of Cr2O3 in chromite samples were discussed, and the uncertainty of determination was evaluated. It was found that, when ferrous ammonium sulfate titration method was used to determine Cr2O3 in chromite samples, an expanded uncertainty of 0. 32% was recorded at Cr2O3 concentration of 43.78%.%讨论了影响铬铁矿中三氧化二铬测定结果不确定度的各种因素,并评定了地质样品中三氧化二铬测定结果的不确定度.结果表明,采用硫酸亚铁铵溶液滴定方法,当样品三氧化二铬的含量为43.78％时,其扩展不确定度U=0.32％.
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