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钡在空气-乙炔火焰中因受到多种因素干扰,直接测定钡难以得到正确结果並且灵敏度低,但在氧化亚氮-乙炔火焰中却有较高灵敏度且几乎消除了干扰。本文着重对氧化亚氮-乙炔火焰原子吸收法测定钡时的最佳原子化区的选择、共存元素的干扰、电离干扰、分子光谱干扰等进行了研究。方法简便、快速,准确度与精密度令人满意。一、主要仪器与试剂日立508型原子吸收分光光度计;氧化亚氮(钢瓶装)。钡标准溶液称取1.437克经110℃烘干的光谱纯碳酸钡,溶於20毫升硝酸(1+1)中,移入1升容量瓶并定容。此溶液为1毫克钡/毫升。钾盐溶液将5.18克硝酸钾(分析纯)溶於100
Barium is disturbed by many factors in the air-acetylene flame. Direct determination of barium results in poor results with low sensitivity, but higher sensitivity and almost no interference in nitrous oxide-acetylene flames. This article focuses on the selection of the best atomization region for the determination of barium by nitrous oxide-acetylene flame atomic absorption spectrometry, the interference of coexisting elements, the ionization interference and the interference of molecular spectroscopy. Method is simple, fast, accuracy and precision is satisfactory. First, the main instruments and reagents Hitachi 508 atomic absorption spectrophotometer; nitrous oxide (steel bottled). Barium standard solution Weigh 1.437 g of spectrally pure barium carbonate dried at 110 ° C., dissolved in 20 ml of nitric acid (1 + 1), transferred to a 1 liter volumetric flask and fixed. This solution is 1 mg barium / ml. Potassium salt solution 5.18 grams of potassium nitrate (analytical grade) was dissolved in 100