Infection Control · single question
In which solution should scrap dental amalgam waste be stored?
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Correct answer: B. In a sealed, airtight container (dry storage preferred; historically also stored under water or fixer)
Current best management practices (per the ADA and EPA) recommend storing scrap dental amalgam waste in tightly sealed, airtight containers labeled as hazardous waste. Dry storage is now preferred because pouring liquid (such as fixer or water) from containers down the drain releases mercury into wastewater systems. Historically, amalgam was stored under photographic fixer or water to prevent mercury vapor release - this practice is now discouraged because the liquid cannot be safely disposed of down drains. Mercury vapor release is the primary concern, as amalgam releases vapor at room temperature. Bleach and oxidizing agents must not be used as they increase mercury vapor release. All amalgam waste must be sent to a certified amalgam recycler.
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