HYDRAZINE
H2NNH2
MW: 32.05
METHOD: 3503, Issue 2
CAS: 302-01-2
3503
RTECS: MU7175000
EVALUATION: FULL
OSHA : 1 ppm (skin) NIOSH: C 0.03 ppm/120 min(suspect carcinogen) ACGIH: 0.1 ppm (skin; suspect carcinogen) (1 ppm = 1.31 mg/m 3 @ NTP)
PROPERTIES:
Issue 1: 15 February 1984 Issue 2: 15 August 1994
liquid; d 1.004 g/mL @ 25 °C; BP 113.5 °C; MP 2 °C; VP 1.92 kPa (14.4 mm Hg; 18,900 ppm) @ 25 °C)
SYNONYMS: diamide; diamine
SAMPLING
MEASUREMENT
SAMPLER:
BUBBLER (15 mL 0.1 M HCl)
TECHNIQUE:
SPECTROPHOTOMETRY, ABSORPTION
FLOW RATE:
0.2 to 1.0 L/min
ANALYTE:
quinoid derivative of p-dimethylaminobenzaldazine [2]
VOL-MIN: -MAX:
7 L @ 1 ppm 100 L
SHIPMENT:
routine
COMPLEXATION: p-dimethylaminobenzaldehyde; stand 30 min; acetic acid
SAMPLE STABILITY:
≥ 6 days @ 25 °C
BLANKS:
2 to 10 field blanks per set
ACCURACY 0.59 to 3.4 mg/m [1] (91-L samples)
BIAS:
625 mL
WAVELENGTH:
480 nm
CALIBRATION:
hydrazine in methanol
RANGE:
9 to 400 µg per sample
PRECISION (Sr):
0.031 [1]
- 0.3%
ˆ ): OVERALL PRECISION (S rT ACCURACY:
FINAL VOLUME:
ESTIMATED LOD: 0.9 µg per sample 3
RANGE STUDIED:
VISIBLE
0.094 [1] ± 17.1%
APPLICABILITY: The working ranges are 0.07 to 3 ppm (0.09 to 4 mg/m 3) for 100-L air samples and 0.45 to 21 ppm (0.6 to 27 mg/m 3) for 15-L air samples. This method is applicable to hydrazine vapor. It has not been tested with aerosol forms. The free base cannot be distinguished from salts, such as hydrazine monohydrochloride and hydrazine sulfate, which are aeros ols.
INTERFERENCES: Methylhydrazine is an interference. Other hydrazines may interfere.
OTHER METHODS: This method is a modification of and replaces Method S237 [2]. Method P&CAM 248 is a gas chromatographic method which can be used for quantitation of hydrazine or substituted hydrazines [3]. Methods S143, S149 and S160 utilize a non-specific colorimetric method for substituted hydrazines [4].
NIOSH Manual of Analytical Methods (NMAM), Fourth Edition, 8/15/94
