National Institute for Occupational Safety and Health

“ Atomize cycle: 10 sec at 2700 to 3000 °C; atomization is too slow for reproducible results below 2600 °C; "maximum power" feature will increase sensitivity. Inject sample aliquot manually or with autosampler. Measure peak height. Analyze a series of standards before and after each set of samples and analyze one mid-range standard after each ten samples. ”

“ Mean recovery was 93% (24 samples) in the range 5 to 121 μg/m 3 (0.0007 to 0.017 ppm) . Breakthrough (effluent = 5% of test concentration) did not occur after sampling for 240 min at 0.475 L/min from an atmosphere containing 34 μg/m 3 (0.005 ppm) Ni (CO) 4 in air at 22 °C and 19% RH. Desorption efficiency for eighteen samples containing 0.08 to 0.5 μg Ni (nickel nitrate standard solution added to 120 mg charcoal) averaged 0.934 with S r = 0.029. Nickel carbonyl was observed to pass quantitatively through 0.8-μm cellulose ester membrane filters in these experiments. ”

“ The prefilter must be used when particulate nickel is present in the air to be sampled. Connect prefilter to sorbent tube with a short section of plastic tubing. 2. Personal sampling pump, 0.05 to 0.2 L/min, with flexible connecting tubing. 3. File, triangular. 4. Atomic absorption spectrophotometer equipped with: a. Heated graphite atomizing rod, tube or furnace (either non-pyrolitic or pyrolitic; better sensitivity with pyrolitic) . NOTE: Reproducible control of times and temperatures during dry, char, and atomize cycles is essential ”