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' Section 4 <br /> 0NSM Environmental Laboratories, Inc Revision 0 <br /> Quality Assurance Plan February 15, 1996 <br /> ' Page 2 of 2 <br /> ' > Two years from opening for metals <br /> > T«o years from opening for all others <br /> 4 23 The follovLuig general guidelines appl4 to the storage and maintenance of reagents <br /> and solvents <br /> > Standard reagents and solvents are stored in accordance with <br /> manufacturer's recommendations <br /> ' > Standards are stored separately from samples to avoid possible cross- <br /> contamination <br /> ' r Organic reagent standards are stored at 4 = 2°C <br /> ' > Organic reference materials are stored at or belov, 0°C <br /> > When fresh stock solutions are required, dilutions of the new standard are <br /> M compared to the current standard or an independent Standard Reference <br /> Material to determine consistencv or to demonstrate traceability <br /> ' 42 Calibration/Certifications <br /> 42 1 All measuring containers used for the preparation of standards are Class A <br /> ' Volumetric flasks and pipettes and are not re-calibrated by the laboratory The <br /> calibration of Eppendorf and Oxford Micropipettors are checked on a periodic <br /> basis <br /> ' 4 2 2 Records and certificates of purity are maintained by the Laboratory Director <br /> Word 6 0\oeLsec4 doc <br />