FORMIC ACID
HCOOH
MW: 46.03
METHOD: 2011, Issue 1
CAS: 64-18-6
2011
RTECS: LQ4900000
EVALUATION: PARTIAL
OSHA : 5 ppm NIOSH: 5 ppm ACGIH: 5 ppm (1 ppm = 1.882 mg/m 3 @ NTP)
PROPERTIES:
Issue 1: 15 August 1994
liquid; BP 107 °C; d 1.22 g/mL (90% solution) @ 20 °C; VP 4.7 kPa (33 mm Hg); vapor density (air = 1) 1.6; colorless; pungent odor
SYNONYMS: hydrogencarboxylic acid; methanoic acid
SAMPLING SAMPLER:
FILTER + SOLID SORBENT TUBE (PTFE membrane, 5-µm + washed, silica gel, 400 mg/200 mg)
FLOW RATE:
0.05 to 0.2 L/min
VOL-MIN: -MAX:
1 L @ 5 ppm 24 L
SHIPMENT:
routine
SAMPLE STABILITY:
1 week @ 25 °C
BLANKS:
2 to 10 field blanks per set
ACCURACY RANGE STUDIED:
not studied
BIAS:
not determined
ˆ ): not determined OVERALL PRECISION (S rT ACCURACY:
not determined
MEASUREMENT TECHNIQUE:
ION CHROMATOGRAPHY, CONDUCTIVITY DETECTION
ANALYTE:
formate ion
DESORPTION:
10 mL deionized water; stand 5 minutes
INJECTION VOLUME:
50 µL
ELUENT:
2.5 mM Na 2B4O 7·10 H 2O, 2.0 mL/min
COLUMN:
Dionex HPIC-AG4 guard, HPIC-AS4 anion separator, anion micromembrane suppressor
DETECTOR:
conductivity, 10 µS full scale
CALIBRATION:
standard solutions of formate spiked onto sample media
RANGE:
6 to 100 µg formate per sample [1]
ESTIMATED LOD: 2 µg formate per sample [2,3] PRECISION(Sr):
0.026 @ 106 to 426 µg per sample [2] 0.097 @ 10 to 80 µg per sample [3]
APPLICABILITY: The working range is 0.13 to 12 ppm (0.25 to 22 mg/m 3) for a 24-L air sample.
INTERFERENCES: None identified.
OTHER METHODS: This is a modification of Method 7903 (Acids, inorganic) and revises Method S173 [1,3].
NIOSH Manual of Analytical Methods (NMAM), Fourth Edition, 8/15/94
