クロム,銅,コバルトの原子吸光法における炎中のノイズ分布

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The distribution of the noise ascribed to the fluctuation of the flame transmission was discussed and the best condition of flame for atomic absorption measurements of chromium, copper, and cobalt was determined. An atomic absorption spectrophotometer (Japan Jarrell-Ash AA-1 MarkII) and hollow cathod lamps (Hamamatsu T.V.) were used for the measurement. Cr 357.9nm, Cu 304.7nm, Co240.7nm were used as the analytical lines. The atomic absorption and base line noise were observed in the air-acetylene flame at every 0.25 1/min of acetylene now rate, where the maximum fluctuation of base line signal recorded in the recorder-chart was adopted as the base line noise component. Air flow rate was maintained at 8.0l/min for all the measurements. After the obtained data were treated with usingc omputers (HITAC 8800/8700) the distributions concerning noise and ratio of signal to noise (S/N) were displayed in the response surface (signal display in the figure of which ordinate is the height above the burner and of which abscissa is the acetylene now rate) and in the cross-section of the flame. In the cross-section of the flame, the region in which the intense atomic absorption was obtained were coincident with the high S/N region. Conversely, at the edge and upper part of the flame, the intensity of noise increases and the S/N ratio decreases comparing with the apparent atomic absorption signal. In the response surfaces, the noise due to the fluctuation of flame transmission, increases toward the upper, acetylene-rich region regardless of the difference in analytical line. Consequently, the region which gives higher S/N ratio can be found at rather acetylene-lean part. Considering the pattern of noise distribution, the scattering of light source radiation due to the carbon particle might play important role as the cause of the flame transmission noise.
社団法人日本分析化学会の論文
1978-01-05

クロム,銅,コバルトの原子吸光法における炎中のノイズ分布

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