ELPAT program report: background and current status (January 1997).
Am Ind Hyg Assoc J 1997 Apr; 58(4):302-306
The background and status as of January 1997 of the Environmental Lead Proficiency Analytical Testing (ELPAT) program were discussed. Interested laboratories were evaluated by comparing their analytical results with those of preselected reference laboratories. Lead (7439921) was analyzed in paint chip, dust and soil samples. Primarily, the data from reference laboratories were collected and treated statistically for outliers. The acceptable performance range for the participating laboratories was +/-3 standard deviations of the treated reference laboratory findings. A laboratory was considered proficient for lead analysis if all four results of the last two rounds of testing were documented and acceptable or if at least three fourths of the results documented within the most recent four rounds were acceptable. ELPAT Round 17 was conducted in November 1996. Paint chips, soil samples and dust wipes were sent to 394 laboratories for analysis. Results were returned by 364 laboratories. The relative standard deviations (RSDs) among the reference laboratories ranged from 6.7 to 8.4% for paint chips, 5.4 to 13.1% for soil samples, and 9.9 to 17.9% for dust wipes. Less than 8.4% of the participating laboratory analyses were outliers. Of the 361 laboratories that submitted paint chip results, 333 to 338 laboratories were considered acceptable. Of the 309 laboratories that submitted soil results, 283 to 295 were acceptable. Of the 330 laboratories that submitted dust wipe results, 315 to 319 were acceptable. The capabilities of various analytical methods to detect lead in paint, soil or dust did not differ significantly. Regarding sample preparation techniques, the microwave digestion method resulted in higher acceptability than the hotplate digestion method, with a maximum difference of 23%. Information concerning the upcoming ELPAT round and details concerning laboratory accreditation were provided.
NIOSH-Author; Analytical-chemistry; Chemical-analysis; Paints; Analytical-methods; Soil-analysis; Dust-analysis; Lead-compounds; Quantitative-analysis; Statistical-analysis; Lead-dust; Laboratory-testing
DHHS/PHS/CDC/ NIOSH, Robert A. Taft Laboratories, 4676Columbia Parkway (MS/ R8), Cincinnati, OH45226
American Industrial Hygiene Association Journal