フツ素に関する衛生学的研究

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タイトル別名
  • Studies on fluoride from hygienic standpoint of view
  • フッソ ニ カンスル エイセイガクテキ ケンキュウ 1
  • Report 1: On the determination of fluoride in water and biological materials
  • 第1編: フッ素の定量法に関する研究

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Colorimetric methods for fluoride, particularly using SPADNS-zirconium (proposed by Bellack and Schouboe) and modified Sanchromine-zirconium lake (by the author), were studied in this paper. Preliminary treatments suitable for various biological samples were also reported.<br>1) Both the SPADNS-Zr and modified Sanchromine-Zr methods were simple, stable and sensitive. As these lake have relatively high tolerance to interfering ions, there was no need for the preliminary clean up method for determining fluorine in drinking water. Thus they are far superior to the routine alizarin-zirconium method in the accuracy, sensitivity and simplicity.<br>2) For the accurate determination of fluorine in ion-rich water, such as mineral water of hot spring, the preliminary treatment with cation-exchange resin was recommended. However, in the case of anion-exchange resin there was found a little leakage of fluorine in the effluent, so that the re-passing through was necessary in some cases.<br>3) In case of heavily polluted sewage, industrial sewage or highly colored and turbid hot spring water, the dry-ashing and steam-distillation procedure were recommeded as the preliminary treatment.<br>4) For the dermination of fluoride in hard tissues, such as bone or teeth, the direct steam-distillation of powedered samples gave satisfactory results, thus enabling to omit the dry-ashing.<br>5) For animal soft tissues, body fluids, milk or urine and agricultural samples, which are all very poor in alkaline earth minerals, the dry-ashing procedure was to be done after mixed with refined CaO and later the steam-distillation was employed.

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