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Table 1: Physical and chemical properties of perfluorocarbon tracers
Property | PFMCH | PFMD | PFD |
CAS Number | 306-94-5 | ||
Molecular Formula | C7F14 | C11F20 | C10F18 |
Molecular Weight (g/mol) | 350.05 | 512.09 | 462.08 |
Boiling Point °C | 76 | 160 | 142 |
Density (g/mL) | 1.788 | 1.972 | 1.908 |
Solubility in Water (mg/L) | ~2 | ~10 | |
Solubility in Methanol (mg/L) | 104 | ||
Solubility in Hexane (mg/L) | 470,000 | ||
Vapor Pressure @ 25C (kPa) | 14.11 | 0.29 |
Notes on PFMD and PFMCH
Both perfluoromethyldecalin (PFMD) and perfluoromethylcyclohexane (PFMCH) are miscible in each other. The vapor pressure of PFMCH is fairly high so it evaporates readily and quickly at standard room pressure and temperature. The evaporation of PFMD is less significant. The low solubility in water for either compound facilitates gas-phase partitioning and quantitative headspace analysis.
The purity of PFMD purchased from Oakwood Chemical is approximately 80-90%. The predominant contaminants tend to be perfluorodecalin and perfluoro-tert-cyclohexane. The purity of a batch may be found by navigating to Oakwood Chemical's website, searching for "decalin", selecting perfluoromethyldecalin, going to the CofA tab and entering the LOT # located on the bottle label.
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