| 摘要 |
PURPOSE:To quickly and easily analyze silicon by dissolving a silicon-contg. iron or steel sample in an acid, adding an ammonium molybdate to the soln. to form a silicomolybdic acid complex and analyzing the same by a flow analysis method. CONSTITUTION:The silicon-contg. iron or steel sample is dissolved in the acid and the sample soln. 1 thereof is passed through a valve 3 and is fed to a capillary 8 in a hot bath vessel 9. The ammonium molybdate 7 is fed through a capillary 6 to the sample soln. and is brought into reaction at about >=50 deg.C hot bath temp. to form the molybdic acid complex. A disturbance suppressor (oxalic acid, etc.) for phosphorus and arsenic is passed through a capillary 10 and is mixed with the molybdic acid complex to decompose the molybdic acid complex of the phosphorus and arsenic. A reducing agent 13 is passed through a capillary 12 and is mixed wit the sample soln. to form a molybdenum blue complex. The absorptivity is measured by an absorption photometer 15 by which the silicon is analyzed. Since the measurement is made by the flow analysis method in the above-mentioned manner, the time for the measurement is shortened.
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