The NIOSH validated method for the determination of formic-acid (64186) is presented. Twenty four liters of air (flow rate at 0.05 to 0.20 liters per minute) are drawn through two glass tubes connected in series containing 60/80 mesh Chromosorb 103 to trap formic-acid vapors. The contents of each tube are transferred to a 20 milliliter (ml) container and the sample is desorbed with 10ml deionized water. The desorbant is injected into an ion chromatograph equipped with an electrolytic conductivity detector. The height of the sample peak is measured. The concentration of formic-acid in the sample is determined by reference to a calibration curve obtained by analyzing standards having concentrations of 0.1 to 3 times the OSHA standard of 9 milligrams per cubic meter (mg/m3). Sample tubes are stored and analyzed immediately or 7 days after collection. Average sample concentrations after 7 days are 91.5 percent of the average concentration found immediately after collection. The useful range is 4.4 to 21.6mg/m3 formic-acid with a standard deviation of formic-acid per sample tube.
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