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Lead migration from lead crystal wine glasses
1Elemental Research Branch, US Food and Drug Administration, Washington, DC 20204, USA.
Food Additives and Contaminants
|October 1, 1996
Summary
Lead leaches from lead crystal wine glasses into wine and acetic acid, with higher release in acidic conditions. Lead release decreases with repeated use, following a predictable model.
Area of Science:
- Materials Science
- Analytical Chemistry
- Food Science
Background:
- Lead crystal glassware is commonly used for serving wine.
- Concerns exist regarding lead migration from crystal into beverages.
- Understanding lead release kinetics is crucial for consumer safety.
Purpose of the Study:
- To quantify lead release from lead crystal wine glasses.
- To compare lead release in wine versus acetic acid solutions.
- To investigate lead release under simulated consumer usage conditions.
Main Methods:
- Lead release measurements at 15 time points (1 min to 24 h).
- Analysis using 4% acetic acid and red wine as extractants.
- Simulated consumer use experiments (chilled/room temp wine, variable/constant contact area).
Main Results:
- Significant lead release observed, with early release being a substantial portion of cumulative release.
- Higher lead release in acetic acid (pH 2.39) than in wine (pH 3.14).
- Repeated leaching showed decreased total lead release, fitting a 1/L^2 model.
Conclusions:
- Wine's higher pH and ethanol content reduce lead release compared to acetic acid.
- Simulated consumer use did not significantly alter lead release compared to static conditions.
- Lead release kinetics can be modeled using the square root of time, applicable to repeated leaching scenarios.