EVALUATION OF METHOD:
Issues 1 and 2
Method, 7300 was originally evaluated in 1981 [2,3]. The precision and recovery data were determined at 2.5
and 1000 µg of each element per sample on spiked filters. The measurements 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. Tables 3 and 4 list the precision and recovery data, instrumental detection limits, and
analytical wavelengths for m ixed cellulose ester (MCE) and polyvinyl chloride (PVC) filters. PVC Filters which
can be used for total dust measurements and then digested for metals m easurem ents were tested and found
to give good results. The values in Tables 3 and 4 were determined with a Spectro Analytical Instruments
Model End On Plasma (EOP)(axial) operated according to manufacturer’s instructions.