PHENYLHYDRAZINE
C6H5NHNH2
MW: 108.14
METHOD: 3518, Issue 1
CAS: 100-63-0
3518
RTECS: MV8925000
EVALUATION:
OSHA : 5 ppm (skin) NIOSH: C 0.14 ppm/120 min (skin) ACGIH: 5 ppm, STEL 10 ppm, suspect carcinogen (1 ppm = 4.42 mg/m 3 @ NTP)
PROPERTIES:
Issue 1: 15 August 1994
solid; MP 19.5 °C; d 1.098 g/mL @ 20 °C; VP 5 Pa (0.04 mm Hg; 50 ppm) @ 25 °C
SYNONYMS: hydrazinobenzene, hydrazine-benzene
SAMPLING SAMPLER:
GLASS MIDGET BUBBLER (containing 15 mL 0.1 M hydrochloric acid)
FLOW RATE:
0.2 to 1 L/min
VOL-MIN: -MAX:
25 L @ 5 ppm 120 L
SHIPMENT:
hand delivery or use of bubbler shipping cases
SAMPLE STABILITY: BLANKS:
MEASUREMENT TECHNIQUE:
VISIBLE ABSORPTION SPECTROPHOTOMETRY
ANALYTE:
phenylhydrazine hydrochloride/ phosphomolybdic acid complex
SAMPLE WORKUP:
transfer bubbler solution, two 5-mL rinses, and 10 mL phosphomolybdic acid to 50-mL volumetric flask
DILUTION:
3-mL aliquot diluted to 10 mL
at least 5 days at room temperature [1]
COLORIMETRY:
absorbance @ 730 nm
2 to 10 field blanks per set
CALIBRATION:
phenylhydrazine hydrochloride in 0.1 M hydrochloric acid
RANGE:
0.5 to 4.4 mg per sample [1]
ACCURACY RANGE STUDIED:
10.4 to 44.8 mg/m 3 [1] (100-L samples)
BIAS:
4.8%
ESTIMATED LOD: 0.2 mg per sample [2] PRECISION (Sr):
0.023 [1]
ˆ ): 0.060 [1] OVERALL PRECISION (S rT ACCURACY:
± 16.6%
APPLICABILITY: The working range is 1.1 to 11 ppm (5 to 45 mg/m 3) for a 100-L air sample.
INTERFERENCES: Other hydrazines may interfere in the analysis; reducing agents such as ferrous salts may interfere also [2].
OTHER METHODS: This is Method S160 [2] in a revised format. Feinsilver et al. [3] provided the basis for this method. Murty et al. [4] used photometry and photometric titrations with cacotheline as a reagent to determine phenylhydrazine i n the range of 0.1 to 2 mg. Hasan [5] determined phenylhydrazine spectrophotometrically over a range of 0.1 to 3.0 mg using copper (II) nitrate.
NIOSH Manual of Analytical Methods (NMAM), Fourth Edition, 8/15/94
