Analysis of formic acid in air samples.

Area of Science:

• Environmental Chemistry
• Analytical Chemistry
• Occupational Health

Background:

• Formic acid is a volatile organic compound with potential health implications.
• Accurate measurement of airborne formic acid is essential for occupational safety and environmental monitoring.
• Existing methods may lack the sensitivity or practicality for routine air quality assessment.

Purpose of the Study:

• To develop and validate a sensitive method for quantifying formic acid in ambient air.
• To provide a reliable analytical technique for assessing airborne formic acid concentrations.

Main Methods:

• Air samples containing formic acid were collected using a midget impinger with sodium hydroxide solution.
• Collected formic acid was converted to volatile ethyl formate using an ethanol-sulfuric acid mixture.
• Ethyl formate was analyzed using gas chromatography with headspace analysis for quantification.

Main Results:

• The method demonstrated a relative standard deviation of 11 percent, indicating good precision.
• The gas chromatography analysis showed a direct proportionality between ethyl formate and formic acid quantities.
• The method is sufficiently precise for evaluating airborne formic acid at 0.1 of the Threshold Limit Value (9 mg/m³).

Conclusions:

• The reported method offers a precise and reliable approach for determining airborne formic acid concentrations.
• This technique is suitable for occupational health assessments and environmental monitoring of formic acid.
• The headspace gas chromatography method provides a practical tool for evaluating exposure to formic acid in the workplace.