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Standard Interpretation

Standard: 2003 NELAC
Section: (c)


Analysis of screening method 505 for 8 aroclors and Toxaphene. We have a question about Continued Proficiency. Is it necessary to perform continued proficiency for all 8 aroclors and toxaphene? Would it be acceptable to perform continued proficiency for only one pattern to meet this requirement?


(Chemistry Expert Committee and NELAP AC, 9-23-15)

For initial demonstrations of capability all analytes of interest would need to be analyzed: In this case all aroclors and Toxaphene. For the continuing demonstration of capability only the method required spiking analytes would be necessary.