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本文研究了标准石墨管、涂钨和涂锆石墨管中锗原子吸光度,吸收信号形状和原子消失速度的变化。实验表明,在涂钨和涂锆石墨管中锗的分析灵敏度有较大的提高。同时实验测得在涂钨石墨管中锗的出现温度为1770K。按公式ΔH°=γTapp求得锗的ΔH°=106.2kcal/mol。它与锗的升华热89.5kcal/mol相近。因此,在涂钨石墨管中锗原子的形成是GeO_2被碳化钨还原成金属锗,随后锗的升华。
In this paper, the changes of absorbance, absorption signal shape and atomic vanishing speed of germanium atoms in standard graphite tube, tungsten coated tube and zirconium coated zirconium tube were studied. Experiments show that the analysis of germanium in tungsten-coated and zirconium-coated graphite tubes has a greater sensitivity. At the same time experimentally measured in the tungsten-coated graphite tube in the emergence of germanium temperature 1770K. According to the formula ΔH ° = γTapp find germanium ΔH ° = 106.2kcal / mol. It is similar to germanium’s sublimation heat of 89.5 kcal / mol. Therefore, the formation of germanium atoms in the tungsten-coated graphite tube is the reduction of GeO 2 by tungsten carbide to metallic germanium, followed by the sublimation of germanium.