目的进行离子色谱法测定水中溴酸根离子含量的不确定度分析。方法按照测定程序,建立数学模型,根据不确定度传播规律,计算出相对和绝对扩展不确定度。结果水样中溴酸根离子的浓度为0.0638mg/L时,其绝对扩展不确定度为±0.0031mg/L。结论该方法在实际工作中有较强的应用价值。 Objective To determine the uncertainty of ionization of bromate in water by ion chromatography. Methods According to the measurement procedure, a mathematical model was established, and the relative and absolute expansion uncertainties were calculated according to the law of propagation of uncertainty. Results When the concentration of bromate ion in water sample was 0.0638mg / L, its absolute expansion uncertainty was ± 0.0031mg / L. Conclusion This method has strong application value in practical work.