• DOI:10.1524/ract.1968.10.12.78
• Corpus ID: 100313675

Zur Kristallchemie des Radiums

@inproceedings{Weigel1968ZurKD,
  title={Zur Kristallchemie des Radiums},
  author={Fritz Weigel and A. Trinkl},
  year={1968}
}

• F. Weigel, A. Trinkl
• Published 1968
• Chemistry

allowing simple analytical fluorine determination by direct titration or PbCIF precipitation. The low boiling point of trimethylfluorosilane (16.4 °C) was expected to be troublesome, but it was found that trimethylfluorosilane solutions in benzene are very stable even on heating to 80 °C, probably because of the formation of π-complexes. The fluorine yields obtained after radiochemical purification by CaS04 separation and subsequent NH4F sublimation varied between 40 and 60%. The radiochemical purity of 18F was very good (i1/2 = 110 + 2 min.). Sublimation alone is quite efficient for separating 18F from all activities except CI, which apparently cosublimes to a small extent. Cosublimation with NH4C1 provides a method for preparing carrier-free 18F. The sublimation method is very simple and many fluorine samples can be handled at the same time. The fluorine yields determined by either titration with the fluorine ion specific electrode or the. PcCIF method agreed well with each other.