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用容量法测定催化剂中CaO、MgO时,因指示剂终点不明显,易使结果产生偏差。为此我们研究用原子吸收光谱的测定方法。方法原理: 当钙和镁空心阴极灯加热时,辐射出的钙和镁的特征谱线的光通过试样蒸汽时,被蒸汽中的钙和镁基态原子所吸收,由光被减弱的程度即可测定样品中CaO、MgO的含量。 A=KLN 式中:A—吸光度;K—吸收系数;L—燃烧器宽度;N—蒸汽中基态原子浓度。
When using the volumetric method to determine the CaO and MgO in the catalyst, the end result of the indicator is not obvious, which may easily result in the deviation of the result. To this end, we study the determination of atomic absorption spectrometry. Principle of the method: When the calcium and magnesium hollow cathode lamps are heated, the light of the characteristic lines of the emitted calcium and magnesium are absorbed by the ground state atoms of calcium and magnesium in the steam when they pass through the sample steam, Can determine the sample CaO, MgO content. A = KLN where: A-absorbance; K-absorption coefficient; L-burner width; N- ground state atoms in the vapor concentration.