Headspace GC/MS testing for chlorodifluoromethane in two fatal cases

Area of Science:

• Forensic Toxicology
• Environmental Health

Background:

• Chlorodifluoromethane (Freon 22) is a widely used hydrofluorocarbon.
• Inhalation of high concentrations can lead to adverse health effects, including cardiac arrhythmias and central nervous system depression.

Purpose of the Study:

• To report two cases of fatal poisoning from chlorodifluoromethane (Freon 22) inhalation.
• To describe the analytical methodology used for detecting and quantifying chlorodifluoromethane in biological samples.

Main Methods:

• Case report of two fatalities linked to Freon 22 inhalation.
• Analysis of biological tissues (blood, urine, vitreous humor, bile) using headspace gas chromatography/mass spectrometry (GC/MS).
• Specific ion monitoring (m/z 67, 86, 51) for identification and quantification.

Main Results:

• Chlorodifluoromethane was identified as the cause of death in both cases.
• Blood concentrations of chlorodifluoromethane were measured at 26.0 and 37.1 µg/mL.
• The compound was also detected in urine, vitreous humor, and bile, albeit at lower levels.

Conclusions:

• Chlorodifluoromethane inhalation can be lethal.
• Headspace GC/MS is a suitable method for detecting Freon 22 in post-mortem biological samples.
• Monitoring specific ions is crucial for accurate quantification in toxicological analysis.