... forOccupational Safety and Health, Publication No. 77-206, August 1977.5. “OSHA Safety and Health Standards, General Industry,” (29 CFR Part 1910),Occupational Safety and Health Administration, ... Wheneverpossible, the laboratory should analyze standard reference materials and participate inrelevant performance evaluation studies.9. Sample Collection, Preservation, and Handling9.1 All samples must ... shipment and storage. A field reagent blank prepared from reagent water and carried through the sampling and handling protocol can serve as a check on suchcontamination.3.3 Contamination by carry-over...