National Institute for Occupational Safety and Health

“ The precision and recovery data were determined at 2.5 and 1000 μg of each element per sample on spiked filters. The m easurements used for the method evaluation in Issues 1 and 2 were determined with a Jarrell-Ash Model 1160 Inductively Coupled Plasma Spectrometer operated according to manufacturer's instructions. Issue 3 In this update of NIOSH Method 7300, the precision and recovery data were determined at approximately 3x and 10x the instrumental detection limits on comm ercially prepared spiked filters [12] using 25.0 mL as the final sample volume. ”

“ OTHER METHODS: This issue updates issues 1 and 2 of Method 7300, which replaced P&CAM 351 [3] for trace elements. Flame atomic absorption spectroscopy (e.g., Methods 70XX) is an alternate analytical technique for many of these elements. Graphite furnace AAS (e.g., 7102 for Be, 7105 for Pb) is more sensitive.
NIOSH Manual of Analytical Methods (NMAM) , Fourth Edition ELEM ENT S (ICP) : ME TH OD 7300, Issue 3, dated 1 5 March 2003 - Page 2 of 8 REAGENTS:
EQUIPMENT:
1. Nitric acid (HNO 3) , conc., ultra pure. 2. ”

“ Analyze a standard for every ten samples. 14. Check recoveries with at least two spiked blank filters per ten samples.
MEASUREMENT: 15. Set spec trome ter to conditions spe cified by manufac turer. 16. Analyze standards and samples. NOTE: If the values for the sam ples are a bove the rang e of th e standa rds, dilute the solutions w ith dilution acid, reanalyze and apply the appropriate dilution factor in the calculations. ”