| 摘要 |
PURPOSE:To atomize an analysis sample without the use of a combustible gas at all, by a method wherein air in an atmosphere pressure is brought into a plasma condition by means of a high frequency, and a brilliance-modulated light source is used. CONSTITUTION:An air plasma 4 is produced by a microwave generated by a magnetron 11. Air is fed by an air pump 14, and a solution sample 13, atomized by a atomizer 12, is mixed. The mixture is caused to flow so as to cover an electrode 9 to form the plasma. 4. A hollow cathode lamp 1 is lighted by a pulsating current of 1.5KHz, and a strength of radiant light is modulated to pass it through the plasma. Light, coming out from the plasma, selects an analysis ray by means of a spectroscope 5 to detect it by a photomultiplier 7. The detecting signal is amplified by a preamplifier 30, it passes through a band-pass filter 31 which passes only a full frequency component of 1.5kHz, and absorbance is displayed in a recorder 33 after passage of it through a logarithmic converter. |
