National Institute for Occupational Safety and Health

“ Laboratory-based methods include atomic spectrophotometric methods following hot plate acid digestion: NIOSH methods 7082 (flame atomic absorption spectrophotometry) [2] , 7105 (graphite furnace atomic absorption spectrophotometry) [3] , and 7300 (inductively coupled plasma atomic emission spectrophotometry) [4] . A field-portable analytical method for lead air filter samples using ultrasound/ASV has been developed, NIOSH Method 7701 [5] . A field-portable screening method by spot test kit has been developed, NIOSH Method 7700 [6] . ”

“ Laboratory prepared aerosol samples would be expected to give better precision. Additionally, the XRF method is non-destructive; samples analyzed in the field can subsequently be analyzed in a laboratory using a method with greater accuracy, as needed. The filter sleeve used with the NITON® 700 Series XRF used a Mylar film to cover and seal the 37-mm filter. The lead particulate on the surface of the filter came into contact with the MylarTM film. Both the MylarTM film and the filter were digested with nitric acid and hydrogen peroxide as is specified in NIOSH Method 7105 [3] . ”

“ NOTE: When the thin film standard measurements are not within the specified parameters, the instrument may need to be recalibrated at the factory. 9. Analyze one thin film standard every 2 hours to check for instrument drift. 10. Repeat step 7 when all analyses are completed as a post-calibration check. MEASUREMENT: NIOSH Manual of Analytical Methods (NMAM) , Fourth Edition LEAD BY FIELD PORTABLE XRF: METHOD 7702, Issue 1, dated 15 January 1998 - Page 3 of 4
11. Set instrument parameters and analyze filter samples as specified by the manufacturer. ”