Page:NIOSH Manual of Analytical Methods - 7102.pdf/1
BERYLLIUM and compounds, as Be
Be
MW: 9.01
METHOD: 7102, Issue 2
CAS: 7440-41-7
RTECS: DS1750000
EVALUATION: FULL
OSHA : 2 µg/m 3; C 5 µg/m 3; P 25 µg/m 3/30 min NIOSH: not to exceed 0.5 µg/m 3 (suspect carcinogen) ACGIH: 2 µg/m 3 (suspect carcinogen)
7102
PROPERTIES:
Issue 1: 15 February 1984 Issue 2: 15 August 1994
hard, light metal; valence +2; MP 1284 to 1300 °C
SYNONYMS: Vary as to compound.
SAMPLING
MEASUREMENT
SAMPLER:
FILTER (0.8 µm cellulose ester membrane)
TECHNIQUE:
ATOMIC ABSORPTION, GRAPHITE FURNACE
FLOW RATE:
1 to 4 L/min
ANALYTE:
beryllium
VOL-MIN: -MAX:
25 L @ 2 µg/m 3 1000 L
ASHING REAGENTS:
HNO 3 , 10 mL; H 2 SO 4 , 1 mL
CONDITIONS: SHIPMENT:
routine
150 °C until brown fumes disappear; 400 °C to dense fumes of H 2 SO 4
SAMPLE STABILITY:
stable
BLANKS:
2 to 10 field blanks per set
FINAL SOLUTION:
GRAPHITE FURNACE: 110 °C dry 20 sec; 900 °C char 10 sec; 2800 °C atomize 18 sec WAVELENGTH:
ACCURACY RANGE STUDIED:
2.7 to 11.8 µg/m 3 [1] (40-L samples)
BIAS:
- 0.39%
ˆ ): 0.064 [1] OVERALL PRECISION (S rT ACCURACY:
± 12.42%
2% Na 2SO 4/3% H 2SO 4; 10 mL
234.9 nm
BACKGROUND CORRECTION: D 2 or H 2 continuum INJECTION VOLUME: 10 µL CALIBRATION:
Be 2+ in 2% Na 2 SO 4 /3% H 2 SO 4
RANGE: ESTIMATED LOD: PRECISION (Sr):
0.05 to 1 µg per sample [2] 0.005 µg per sample [2] 0.008 [2]
APPLICABILITY: The working range is 0.5 to 10 µg/m 3 for a 90-L air sample. The method is applicable to ceiling measurements using a 25-L air sample.
INTERFERENCES: Calcium interference is masked by 3% (v/v) sulfuric acid. Sodium, potassium, and aluminum enhance beryllium absorbance; this effect is overcome by addition of 2% (w/v) sodium sulfate to both standards and samples. Perc hloric, phosphoric, and hydrofluoric acids produce interfering non-atomic peaks. These must be removed by digesting to dryness.
OTHER METHODS: This revises Method P&CAM 288 [2], which replaced Method S339 [3]. Flame atomic absorption and plasma emission (ICP-AES) are not sensitive enough for beryllium at these concentrations.
NIOSH Manual of Analytical Methods (NMAM), Fourth Edition, 8/15/94