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11 <br />I. U.S. Environmental Protection Agency and State certification programs. <br />Z. Participation in an inter -laboratory or "round-robin" quality assurance program. <br />3. Verification of results with an alternative method. For example, calcium may be determined <br />by atomic absorption, ion chromatography, or titrimetric methods. Volatile organics may be <br />determined through either purge and trap or liquid -liquid extraction methods. <br />1.4 Miscellaneous Checks of Accuracy <br />Where trace analysis is involved, purity of the solvents, reagents, and gases employed is of great cahcern. <br />The laboratory maintains a service contract on all major instrumentation; gas chromatographs, atomic <br />absorption, ion chromatography, and total organic carbon analyzers are all serviced and maintained <br />regularly. <br />