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随着石墨炉原子吸收光谱分析技术的发展和广泛应用,发现普通石墨制作的石墨管存在若干缺欠,许多干扰与普通石墨管在高温下连续使用有一定的关系.例如石墨与某些元素在高温时发生强烈的作用,形成难熔碳化物或石墨化的中间化合物等,造成记忆效应,或者给某些元素的测定带来困难,甚至无法测定;在高温下连续使用,其强度因为石墨的挥发或升华而降低,以致出现裂纹,因此使用寿命短,测定灵敏度变化显著而重现性亦恶化;从炽热的管壁飞溅出的石墨微粒造成光散射,增加背景吸收;溶液渗入多
With the development and extensive application of graphite furnace atomic absorption spectrometry, it is found that there are some shortcomings in graphite tubes made of ordinary graphite, and many of the interferences are related to the continuous use of ordinary graphite tubes at high temperatures, such as graphite and some elements at high temperature When the strong role of the formation of refractory carbide or graphitized intermediate compounds, resulting in memory effect, or to some elements of the determination of the difficulties, or even impossible to measure; continuous use at high temperatures, the intensity of graphite as the volatility Or sublimation reduce, resulting in cracks, so the service life is short, significant changes in measurement sensitivity and reproducibility also deteriorated; graphite particles splashed from the hot tube wall caused by light scattering, increased background absorption; solution infiltration and more