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The spiking occurs prior to sample preparation and analysis. They are used to document the precision and bias of a method in a given sample matrix. An analyte free matrix to which all reagents are added in the same volumes or proportions as used in sample processing.

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The full text of the Code of Federal Regulations, the LSA (List of CFR Sections Affected), The United States Government Manual, the Federal Register, The Office of the Federal Register also offers a free service on the National Archives and Records Administration's (NARA) World Wide Web site for public law numbers, Federal Register finding

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The British Asbestos Research Council recommended filter membrane counting in 1969. In July 1969, the Bureau of Occupational Safety and Health published a filter membrane method for counting asbestos fibers in the United States. This method was refined by NIOSH and published as P CAM 239.

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