原子吸光分析法による有機化合物中のフッ素の間接定量

概要

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In order to determine fluorine in organic compounds, the authors attempted the indirect determination of fluorine by decomposing fluorine-containing derivatives with sodium biphenyl, followed by atomic absorption spectrometry of iron in MIBK phase. The recommended procedure is as follows: The aqueous solution seperated after the decomposition with sodium biphenyl, was adjusted its pH at 3.0 with 0.2 N hydrochloric acid. To 5 ml of this solution, was added one ml of an excess of a ferric chloride solution which contains 10 μg/ml of Fe and then one ml of 2.5% ammonium thiocyanate solution. Excess iron was extracted with 2 ml of MIBK as ferric thiocyanate and the iron content extracted was measured by atomic absorption spectrometry. Fluorine is determined indirectly by this method and the calibration curve was linear in the range of (0.5〜6.0) μg/ml. Metals which form more stable fluorine complexes than Fe(III) interfer, but the anions except CN^- does not disturb the measurement.
1976-01-10