| 摘要 |
PURPOSE:To obtain a method which exhibits high detection sensitivity and reproducibility by adding a metal compd. forming a composite compd. with stannic oxyacid ion in a 0.5-5% range to a sample and ashing the sample. CONSTITUTION:The sample prepd. to a liquid state is injected from a sample injection port 1b into a graphite tube 1 and after the soln. of Al hydroxide is added thereto, the graphite tube 1 is heated up to about 1,200 deg.C, then the stannic oxyacid ion generated in the ashing process of the sample reacts with the Al liberated from the Al hydroxide and forms the Al oxyacid stannate of the composite compd. Since the Al oxyacid stannate is the material thermally stable at about 1,200 deg.C which is the ashing temp., the tin ion does not dissipate from the tube 1 in the ashing stage. The Al oxyacid stannate is then dissociated to the tin ion and Al ion to form the tin atom maintaining the concn. at the time of sampling when the current to the tube 1 is increased and the temp. thereof is increased to about 2,600 deg.C. The light absorbance is thus detected.
|
