石墨消解连续光源原子吸收法测定废气中重金属

Determination of heavy metal in waste gas by continuous light source atomic absorption spectrometry with graphite digestion

采用DEENA石墨消解仪对采集的废气样品进行前处理,利用contrAA700连续光源原子吸收光谱仪测定样品中重金属铜、锌、镍、铅、镉、锰。本试验优化了消解液的组合,使样品消解更完全,且克服了传统火焰原子吸收法需要更换空心阴极灯的缺陷,提高了分析速度。各元素的检出限分别为铜0.0025mg/m^3,锌0.0012mg/m^3,镍0.0038mg/m^3,锰0.0025mg/m^3,铅0.0075mg/m^3,镉0.0025mg/m^3。各元素的回收率分别为铜94.2%,锌102.5%,镍95.6%,锰104.1%,铅97.3%,镉95.3%。本方法具有较高的准确度,相比传统的火焰原子吸收法有更高的工作效率,适用于废气中多种重金属的同时测定。

The detection limits were 0. 0025mg/m3 for Cu, 0. 0012mg/m3 for Zn, 0. 0038mg/m3 for Ni, 0. 0025mg/m3 for Mn, 0. 0075mg/m3 for Pb, and 0. 0025mg/m3 for Cd. The recovery rates were 94.2% for Cu, 102.5%for Zn, 95.6% for Ni, 104.1% for Mn, 97.3% for Pb, and 95.3% for Cd. Compared to the traditional flame atomic absorption method, this method is more effective and suitable to determine the contents of multi-heavy metals in waste gas samples.