Graphite cuvette null for atomic absorption analysis device

摘要

PURPOSE:To optimize the detection threshold at the time of a blank test and to remove errors by decreasing the impurity content in a carbon material to enhance the purity of the carbon material. CONSTITUTION:Gaseous halogen and gaseous H2 are passed in and under a vacuum and reduced pressure while the gases are heated by a high-frequency heating method and the impurities, particularly metallic impurities, contained in graphite are converted to halogen salts. The vapor pressure is then increased to enhance the purity of the graphite by the evaporation and dissipation thereof. As a result, the high-purity graphite of =1ppm is obtd. The resulted high-purity graphite material is suitable for the graphite cuvette for the atomic absorption spectroscopic analysis apparatus.