National Institute for Occupational Safety and Health

“ Calibrate daily with at least six working standards over the range 0.005 to 1 μg Be per sample. a. Use serial dilutions of known amounts of calibration stock solution in 2% Na 2SO 4/ 3% H 2SO 4 to prepare working standards. Store in polyethylene bottles. Stable at least four weeks. b. Analyze together with samples and blanks (steps 11 and 12) . NOTE: Analyze working standards alternately with the samples to compensate for the increasing Be signal as the graphite tube ages. Analyze three quality control blind spikes and three analyst spikes. ”

“ Set spectrophotometer and graphite furnace according to manufacturer's recommendations and to conditions on page 7102-1. Inject 10-μL aliquots of samples into graphite tube. Record absorbance (peak height mode) . ”

“ Beryllium is very toxic and a suspected human carcinogen [4] . Perform all acid digestions in a fume hood.
SAMPLING: 1. 2.
Calibrate each personal sampling pump with a representative filter in line. Sample at an accurately known flow rate between 1 and 4 L/min for a sample size of 25 to 1000 L. Do not exceed 2 mg total dust loading on the filter.
SAMPLE PREPARATION: 3. 4. 5. ”