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Region 9 Laboratory SOP 130
Glassware Cleaning Procedures
Summary
This method describes the procedures for cleaning laboratory glassware used for preparation of environmental samples for trace analysis of organic and inorganic analytes. The glassware is first rinsed by the analyst to remove sample, solvent and acid residues. Acetone is used to remove any labels written on the glassware. The glassware cleaning technician then detergent washes the glassware (either manually or using a dishwasher). Glassware used for analysis of trace organic compounds is heated in a high temperature oven or muffle furnace at 400°C to destroy all organic compounds. Glassware used for inorganic analysis is acid cleaned with 10% nitric acid to remove any metallic residue. Glassware used for chlorinated acid herbicide extractions and total Kjeldahl nitrogen analysis is acid rinsed with 10% sulfuric acid.