石墨炉原子吸收光谱中氯化铕和硝酸铕背景吸收来源与特点的研究

Studies of the Background Absorption of Europium Matrix in GFAAS

研究了石墨炉原子吸收中氯化铕和硝酸铕背景吸收的来源、特点和消除方法。氯化铕背景吸收来源于其分解产物EuCl_2蒸气和Cl_2,而硝酸铕背景吸收来源于其分解产物NO和Eu_2O_3蒸气。测定铕中微量元素时,可通过选择灰化温度、记录原子吸收峰时间或加硝酸作基体改进剂等方法米减少、甚至完全消除背景吸收的干扰。

The nature and source of the background absorption of curopium matrix and the methodof eliminating the background were studied. The results showed there is one background peakof EuCL_3. It arises from evaporation of EuCl_2. There are two peaks of the background ofEu(NO_3)_3. The first peak arises from NO and the second peak arises from Eu_2O_3. Thebackground interferences can be decreased or eliminated by the choice of an appropriatesignal recording time, appropriate ashing time and adding matrix modifiers.