原子荧光光谱法测定汽油中的汞含量

利用氧化燃烧将汽油中的汞释放出来,并用硝酸溶液收集,在还原剂(SnCl_2)和原子化器的作用下生成原子态汞。最终通过原子荧光光谱检测荧光强度对汽油中汞含量进行测定。汞原子的荧光强度与其浓度在0~20μg/L的范围内具有很好的线性关系。其线性相关系数为0.999 7,检出限为0.004μg/L。加标回收率达到86%,相对标准偏差小于3.0%。通过对大量汽油样品的检测,结果表明,汽油中汞的含量极少,一般为ppb级。

Determination of Mercury in Gasoline by Atomic Fluorescence Spectrometry

The mercury in gasoline was released by oxidative combustion, and collected with nitric acid solution. Then the mercury was atomized in the role of reductant (SnCl2) and atomizer. The content of mercury was determined by measuring the fluorescence intensity with AFS. The results show that the fluorescence intensity of mercury has a good linear relationship with its concentration in the range of 0~ 20 μg/L. The linear correlation coefficient is 0.9997 and the detection limit is 0.004 μg/L. The recovery rate of mercury is 86% and the relative standard deviation is less than 3.0%. Through the detection of a large number of gasoline samples, the results show that the content of mercury in gasoline is very low, with ppb level.