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