VANADIUM OXIDES
(1): V2O5 MW: (2): V2O3 (3): NH4VO3
(1): 181.88 (2): 149.88 (3): 116.99
METHOD: 7504, Issue 2
CAS: (1) 1314-62-1 (2) 1314-34-7 (3) 7803-55-6
7504
RTECS: (1) YW2450000 (dust) (1) YW2460000 (fume) (2) YW3050000 (3) YW0875000
EVALUATION: PARTIAL
C 0.5 mg/m 3 (as V) (V 2O 5 Dust); C 0.1 mg/m 3 (as V) (V 2O 5 Fume); 1 mg/m 3 (FeV) NIOSH: C 0.05 mg/m 3/15 min (as V 2O 5) ACGIH: 0.05 mg/m 3 (respirable, as V 2O 5) OSHA:
Issue 1: 15 August 1987 Issue 2: 15 August 1994
PROPERTIES: solids; MP 658 °C (1); MP 1967 °C (2)
SYNONYMS: (1): vanadic anhydride; vanadium pentoxide; (2): vanadic oxide; vanadium sesquioxide; vanadium trioxide. SAMPLING SAMPLER:
FLOW RATE:
MEASUREMENT
CYCLONE + FILTER (10-mm cyclone or Higgins-Dewell (HD) + 5-µm PVC membrane) HD cyclone: 2.2 L/min nylon cyclone: 1.7 L/min
VOL-MIN: -MAX:
200 L @ 0.5 mg/m 3 1000 L
SHIPMENT:
routine
SAMPLE STABILITY:
stable
BLANKS:
2 to 10 field blanks per set
BULK SAMPLE:
X-RAY POWDER DIFFRACTION
ANALYTE:
vanadium pentoxide, vanadium trioxide, or ammonium metavanadate
SAMPLE PREPARATION:
Cu target X-ray tube optimize for intensity; 1° 2 θ slit graphite monochromator scintillation detector integrated intensity with background subtraction slow step scan (10 seconds/0.02° 2 θ)
CALIBRATION:
standard suspensions deposited on Ag filter
RANGE:
0.1 to 2 mg V per sample
of
analytes
ESTIMATED LOD: Table 1
RANGE STUDIED:
(1): 0.8-2.6 mg/m 3; (2): 0.2-2.6 mg/m 3 [1]
BIAS:
Table 1
ˆ ): OVERALL PRECISION (S rT
dissolve filter in tetrahydrofuran; redeposit on Ag filter
XRD:
high-volume respirable (preferred) or settled dust to identify interferences
ACCURACY
ACCURACY:
METHOD:
PRECISION (Sr):
Table 1
Table 1 ± 26 to 62%
APPLICABILITY: The working range is 0.2 to 4 mg/m 3 (as V) for a 500-L air sample. The method will determine V 2O 5, V2O 3, and NH 4VO 3 separately on the same sample. INTERFERENCES: α-Quartz (likely to be found in mineral samples) interferes (Table 1) but alternative diffraction lines are available. Most other compounds likely to be in the sample do not interfere [1].
OTHER METHODS: This replaces P&CAM 364 [2]. Methods S391 (Vanadiaum by graphite atomizer AAS) and 7300 (Elements by ICP-AES) determine total V.
NIOSH Manual of Analytical Methods (NMAM), Fourth Edition, 8/15/94
