Accession Number : ADB811140


Title :   Determination of Fluorine in Fluoro-Organic Compounds in Low Concentrations in Air


Corporate Author : VIRGINIA UNIV CHARLOTTESVILLE


Personal Author(s) : Yoe, J H ; Salabury, J M ; Cole, J W


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/b811140.pdf


Report Date : 27 Jun 1944


Pagination or Media Count : 27


Abstract : An apparatus for the preparation of mixtures of fluoro-organic compounds and air, and a method for the determination of fluorine in such compounds are described. The analysis involves (1) removing the fluoro-organic compounds by scrubbing the air mixture with l-hexanol, (2) decomposing the fluoro-organic compound by refluxing with sodium, (3) extracting with water the sodium fluoride thus formed and (4) titrating the fluoride ion with thorium nitrate solution, using Solochrome Brilliant Blue BS as indicator. This method has been tested in the concentration range of 0.002 to 2 mg. of fluoride which is equivalent to 0.01 to 8 mg. of fluoro-organic compound per liter of air. Three fluoro-organic compounds were analyzed. With methyl fluoroacetate in the range 0.01 to 8 mg. per liter, a recovery of about 90% was obtained. About 90% of 2-fluoroethanol was recovered from air mixtures when the concentration was 0.02 to 3 mg. per liter; when the concentration was 0.01 to 0.03 mg. per liter, the recovery was only about 75%. The recovery of di-isopropylfluorophosphate is 72% at a concentration of 0.02-0.04 mg. per liter, 84% at 0.07-0.15 mg. per liter, and 68% at 1-2 mg. per liter. By using two scrubbers in series, 90% of di-isopropyl fluorophosphate was recovered at a concentration of 1 to 2 mg. per liter.


Descriptors :   *FLUORINE , ACETATES , FLUORINE COMPOUNDS , METHYL RADICALS , NITRATES , ORGANIC COMPOUNDS , PREPARATION , RECOVERY , SCRUBBERS


Subject Categories : Organic Chemistry


Distribution Statement : APPROVED FOR PUBLIC RELEASE