Fluorine, determination oxygen flask combustion

Another destructive method for the determination of organic fluorine is oxygen-flask combustion [3,16,17]... 

Method 2.4 Determination of Fluorine in Fluorinated Polymers. Oxygen Flask Combustion - Spectrophotometric Procedure [39]... 

METHOD 79 - DETERMINATION OF FLUORINE IN FLUORINATED POLYMERS. OXYGEN FLASK COMBUSTION - SPECTROPHOTOMETRIC... 

While in these laboratories the oxygen flask combustion method has been used without any difficulty for the determination of fluorine in triamcinolone and other fluorinated steroids use of the Pregl-Roth distillation method has also been recommended . 

For an idea of some historic and more recent applications of electrochemical techniques, the reader is referred to Table 2.11 of applications providing examples of applications of electrochemical analytical techniques to elemental determinations in a variety of materials. Shearer and Morris (1970) report on the microdetermination of fluorine in organic compounds with a fluoride ion electrode following an oxygen flask combustion based on the careful work of Morris. Dabeka et al. (1979) developed a microdiffusion and fluoride-specific electrode determination of fluoride in foods. Determination of lead and cadmium in foods by anodic stripping voltammetry ... 

A method for the determination of fluorine in fluorinated polymers such as polytetrafluoroethylene (PTFE) is based on decomposition of the sample by oxygen flask combustion followed by spectrophotometric determination of the fluoride produced by a procedure involving the reaction of the cerium(III) complex of alizarin complexan (1,2-dihydroxy-anthraquinone-3-ylmethylamine N,N-diacetic acid). The blue colour of the fluoride-containing complex (maximum absorption, 565 nm) is completely distinguishable from either the yellow of the free dye (maximum absorption, 423 nm) or the red of its cerium(III) chelate (maximum absorption, 495 nm). 

A method has been described [17] for the determination of chlorine in polymers containing chlorine, fluorine, phosphorus and sulfur, which involves oxygen flask combustion over water, addition of ethanol, and titration to the diphenylcarbazide indicator end point with 0.005 M mercuric nitrate ... 

Method 2.1 Determination of Chlorine in Polymers Containing Chloride and Sulfur and/or Phosphorus and/or Fluorine. Oxygen Flask Combustion - Mercurimetric Titration... 

This oxygen flask combustion - titration method is capable of determining down to 5 ppm chlorine in polymers without interference from any fluorine, phosphorus, or... 

This oxygen flask combustion spectrophotometric procedure is capable of determining fluorine in fluorinated polymers such as PTFE in amounts down to 0.5%. 

Determination of chlorine in polymers containing chlorine and sulphur and/or phosphorus and/or fluorine. Oxygen flask combustion - mercurimetric titration... 

Determination of fluorine in polymers. Oxygen flask combustion spectrophotometric procedure... 

Application of the oxygen-flask combustion method to the determination of fluorine in organic combination has now been made by a number of workers. The fluoride in solution after combustion may be determined by thorium nitrate titration or colorimetrically as the alizarin complexan chelate or with a chloranilate (see Halogen Acids and Salts, p. 302). A method based upon the alizarin complexan chelate is given in Appendix IV. 

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