CaF帯スペクトルによる天然産炭酸カルシウム中のフッ素の分光分析

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タイトル別名
  • Spectrochemical determination of fluorine in natural calcium carbonates using a band spectrum of CaF
  • CaFタイ スペクトル ニ ヨル テンネンサン タンサン カルシウム チュウ ノ フッソ ノ ブンコウ ブンセキ

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抄録

Limestones and calcareous sinters often contain small amounts of fluorine. To determine spectrochemically the fluorine contents of these samples, a visual method was applied, in which use was made of a band spectrum of CaF in the visible region.<BR>The outer fringe of an arc column was observed with a spectroscope of constant deviation type. A series of standards for fluoride was prepared by diluting pure calcium fluoride with pure precipitated calcium carbonate.Optimum conditions for the visual method were investigated and a suitable procedure was established as follows: The sample was excited with a D. C. arc of 10A from 100V D.C.source, and the time of duration of the CaF band head at 5291Å(green) in the field of the telescope was measured. A calibration curve could be drawn for the range between 0.001 and 0.1% fluorine, within which the curve was approximately linear. Thus, within experimental errors of ±20% can be determined the fluorine contents of natural calcium carbonates.<BR>Small amounts of magnesium, phosphorus, sulfur and silicon gave no interference. Alkali metals gave low values. Large amount of iron impaired the test, the sample being often spattered on arcing.

収録刊行物

  • 分析化学

    分析化学 9 (12), 989-992, 1960

    公益社団法人 日本分析化学会

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