论文部分内容阅读
目的基于铬酸钡原子吸收法测定硫酸盐原理,探索出一套采用火焰原子吸收光谱法间接测定工作场所中二氧化硫浓度的方法。方法用高氯酸溶液收集空气中的二氧化硫,将空气中的亚硫酸根被氧化成硫酸根,用铬酸钡悬浊液使之生成硫酸钡沉淀,用火焰原子吸收光谱法吸收释放的铬酸根,间接求出二氧化硫含量,从而求得采集样品中二氧化硫浓度。结果工作标准曲线关系数为0.9992,检出限值为0.12μg/m L,加标回收率在95.0%~106.0%之间。结论采用火焰原子吸收光谱法测定工作场所中的二氧化硫,操作方法简单,检出限值较小,结果可靠。
OBJECTIVE To determine the sulfate principle based on barium chromate atomic absorption spectrometry and to explore a method for the indirect determination of sulfur dioxide concentration in the workplace by flame atomic absorption spectrometry. Methods The perchloric acid solution was used to collect the sulfur dioxide in the air. The sulphite in the air was oxidized to sulfate. The precipitated barium sulphate was formed by the suspension of barium chromate. The released chromate was absorbed by flame atomic absorption spectrometry , Indirectly determine the sulfur dioxide content, thus obtaining the concentration of sulfur dioxide in the collected samples. Results The calibration curve was 0.9992, the detection limit was 0.12μg / m L, and the recoveries ranged from 95.0% to 106.0%. Conclusion Determination of sulfur dioxide in the workplace by flame atomic absorption spectrometry has simple operation method, small detection limit and reliable results.