National Institute for Occupational Safety and Health

“ The validated method was needed to provide air monitoring capabilities during methyltin chloride and stabilizer production. Table 2 lists the results of the validation experiments which followed the guidelines established by NIOSH [2] . However, fewer replicates and concentration levels were used than recomm ended. This method m et the NIOSH criteria for accuracy, bias and sample stability. The recom m ended sampling conditions are 250 ml/min for 5.5 hours maximum for time-weighted average (TW A) sampling and 1000 ml/min for 20 minutes maximum for short-term exposure limit (STEL) sampling. ”

“ L and 1.0 and 2.0 mL. 11. Refrigerant packs for shipping.
See SPECIAL PRECAUTIONS SPECIAL PRECAUTIONS: Concentrated acetic acid is corrosive and an irritant. Sodium Tetraethylborate is sensitive to air and m oisture. This chem ical should be stored and h andled unde r a nitrogen a tm osp here . Ace tonitrile, diethyl ether, and h exa ne a re all flam m able. W ear a ppro priate protective clothing and work with these compounds in a well ventilated hood. SAMPLING: 1. Calibrate each personal sampling pump with a representative sampler in line. 2. ”

“ NOTE: If peak area is above the linear range of the working standards, dilute with hexane, reanalyze, and apply the appropriate dilution factor in the calculations. 15. Mea sure the area s of th e pe aks of th e m ethyltin chlorides . A sample chromatogram is shown in Figure 1.
CALCULATIONS: 16. Determine the m ass , :g (corrected for DE) , for each m ethyltin chloride found in the sam ple front (W f) and back (W b) sorbent sections, and in the averag e m edia blank front (B f) and back (B b) sorbent sections. NO TE: If W b > W f/10, report breakthrough and possible sample loss. 17. ”