微波消解–石墨炉原子吸收光谱法测定空气中碲

Determination of tellurium in air by Microwave Digestion–Graphite Furnace Atomic Absorption Spectrometry

建立微波消解–石墨炉原子吸收光谱法测定空气中的碲。采用微孔滤膜收集样品,以硝酸–双氧水混合体系微波消解滤膜,氯化钯为基体改进剂,在优化的仪器工作条件下测定。碲的质量浓度在0~15μg/L范围内与吸光度线性关系良好,相关系数为0.999 5,方法检出限为0.14μg/L。样品加标回收率在95.6%~104.0%之间,测定结果的相对标准偏差为1.15~1.37%(n=7)。该方法操作简单、灵敏度高,适用于空气中微量碲的测定。

A method for the determination of tellurium in air by microwave digestion–graphite furnace atomic absorption spectrpmetry was established. Microporous membrane was used to collect samples, microwave digestion filter was carried out with nitric acid hydrogen peroxide mixture system. Palladium chloride was used as matrix modifier and sample was determined under the optimized instrument working conditions. The mass concentration of tellurium had good linear relationship with the absorbance in the range of 0–15 g/L, and the correlation coefficient was 0.999 5, the detection limit was 0.14 g/L. The sample standard addition recovery was 95.6%–104.0%, the relative standard deviation of determination results was 1.15%–1.37%（n=7）. The method is simple and sensitive, and it is suitable for the determination of trace tellurium in air.