用萃取分光光度法测定工业废气中的游离溴,并对样品的采集与保存、萃取条件的选择进行了研究。结果表明,当溴的含量在18.0～450.0μg/mL范围内时,吸光度与浓度具有良好的线性关系。方法的采样效率大于99％,精密度和准确度较好。当采集气体为100L时,最低检出浓度为0.14mg/m~3。 Determination of free bromine in industrial waste gas by extraction spectrophotometry, and the selection of sample collection and preservation and extraction conditions were studied. The results showed that there was a good linear relationship between absorbance and concentration when the content of bromine was in the range of 18.0-450.0 μg / mL. The sampling efficiency of the method is more than 99%, the precision and accuracy are better. When the collected gas is 100L, the lowest detected concentration is 0.14mg / m ~ 3.