National Institute for Occupational Safety and Health

“ Remove and discard back sorbent section of a media blank sampler. Inject a known amount (1 to 20 μL) of calibration stock solution or a dilution thereof directly onto front sorbent section with a microliter syringe. c. Cap the tube. Allow to stand overnight. d. Desorb (steps 5 through 7) and analyze together with working standards (steps 11 and 12) . e. Prepare a graph of DE vs. mg methyl iodide recovered. Analyze three quality control blind spikes or three analyst spikes to ensure that the calibration graph and DE graph are in control. ”

“ Methyl iodide is an acute neurotoxin and may produce severe narcosis. It is a suspected carcinogen [4,5] .
SAMPLING: 1. 2. 3. 4.
Calibrate each personal sampling pump with a representative sampler in line. Break the ends of the sampler immediately before sampling. Attach sampler to personal sampling pump with flexible tubing. Sample at an accurately known flow rate between 0.01 and 1 L/min for a total sample size of 15 to 50 L. Cap the samples. Pack securely for shipment. ”

“ Inject sample aliquot manually using solvent flush technique or with autosampler. NOTE: If peak area is above the linear range of the working standards, dilute with toluene, reanalyze, and apply the appropriate dilution factor in calculations. ”