Laboratory and analytical method performance of lead measurements in paint chips, soils, and dusts.
Schlecht-PC; Groff-JH; Feng-A; Song-R
Am Ind Hyg Assoc J 1996 Nov; 57(11):1035-1043
The performance of nearly 400 laboratories, sample preparation techniques, and instrumental methods of the Environmental Lead Proficiency Analytical Testing (ELPAT) program over the 1992 to 1995 period was summarized. Lead (7439921) (Pb) measurements were obtained from real world samples of paint chips, soils, and dusts. The proficiency rating criteria for the laboratories participating the in the ELPAT program were discussed. Up to 93% of the laboratories in the ELPAT program met the proficiency criteria established by NIOSH. Interlaboratory variability for paint chips was about 10% relative standard deviation (RSD) for Pb levels near 0.5%. For soil samples, RSDs were approximately 9 to 10% near federal soil standards and about 16% for the lowest state bare soil standard currently in existence. RSDs ranged from 10 to 16% for Pb levels near relevant Housing and Urban Development standards for dust wipe samples. Similar results were seen for a variety of methods. No statistically significant differences were seen in the three most commonly utilized instrumental methods, flame atomic absorption (FAA), inductively coupled plasma/atomic emission spectroscopy (ICP/AES), and graphite furnace atomic absorption, in their abilities to meet ELPAT performance standards. No clearly significant differences have been found among hotplate and microwave sample preparation techniques, and ultrasonic extraction methods have been successfully used by several laboratories. Small biases among principal instrumental techniques such as FAA and ICP/AES were found to exist.
NIOSH-Author; Laboratory-techniques; Analytical-methods; Quality-control; Heavy-metals; Laboratory-testing; Soil-analysis; Sample-preparation;
Author Keywords: Environmental Lead Proficiency Analytical Testing program; laboratory-to-laboratory variability; lead measurements; National Lead Laboratory Accreditation Program
American Industrial Hygiene Association Journal