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• • <br /> 1. U S. Environmental Protection Agency and State certification programs. <br /> I 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, ton chromatography, or titrimetnc methods. Volatile organics may be <br /> determined through either purge and trap or liquid-liquid extraction methods. <br /> 1.4 Miscellaneous Checks of Accura <br /> Where trace analysis is involved,purity of the solvents,reagents,and gases employed is of great cd-hcein <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 />