グラファイトファーネスアトマイザーを用いたフレームレス原子吸光法による鉄鋼中微量アルミニウムの定量

抄録

Atomic absorption spectrometry with the HGA-2100 graphite furnace atomizer was used for the determination of aluminum greater than 0.0002% in iron and steel. Analytical sensitivity for aluminium was about ten times in comparison to that by the flame atomization method and the precision and accuracy were also satisfactory. Sample solution prepared by sulfuric acid decomposition was dried for 30 sec at 100°C, ashed for 60 sec at 1200°C, and atomized for 8 sec at 2700°C. The absorption signal at 309.3 nm was observed with a deuterium arc back ground corrector. Acid soluble aluminium of carbon steel and stainless steel was determined directly by an identical calibration curve without elimination of the bluk iron in sample solution. It was indispensable to use the standard addition method for the determination of acid insoluble aluminium to reduce the serious interferences due to coexisting elements in sample. Simple standard addition method, which is specific for the graphite furnace atomization, is especially recommended as a good method because sample solution volume for the measurement is very small and sample preparation is easy.