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2 . Participation on an interlaboratory or "round-robin" <br /> quality assurance program. <br /> 3 . verification of results with an alternative method. For <br /> example, calcium may be determined by atomic absorption, <br /> ion chromatography, or titrimetric methods. Volatile or- <br /> ganics may be determined through either purge and trap or <br /> liquid-liquid extraction methods. <br /> 3 . 4 Miscellaneous Checks of Accuracy <br /> where trace analysis is involved, purity of the solvents, re- <br /> agents and gases employed is of great concern. The laboratory <br /> maintains a service contract on all major instrumentation; gas <br /> chromatograph, atomic absorption, ion chromatography, and total <br /> organic carbon analyzers are all serviced and maintained regular- <br /> ly. <br /> The above program is more than sufficient for most needs. Addi- <br /> tional quality assurance such as spikes and duplicates on all <br /> analyses, will be provided if requested. <br /> Papa! 3 <br />