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Asbestos Fiber Preparation Methods Affect Fiber Toxicity.
Ashkan Salamatipour1, Sanjay K Mohanty2, Ralph A Pietrofesa1
1Division of Pulmonary, Allergy, and Critical Care Medicine and the Department of Medicine, University of Pennsylvania Perelman School of Medicine, 3450 Hamilton Walk, Philadelphia, Pennsylvania 19104, United States.
Environmental Science & Technology Letters
|August 20, 2016
Summary
Asbestos fiber preparation methods impact toxicity. Dry-ground asbestos showed higher toxicity due to increased iron content, affecting reactive oxygen species generation in macrophages.
Area of Science:
- Environmental Health
- Toxicology
- Materials Science
Background:
- Asbestos fibers are known carcinogens causing lung diseases like mesothelioma.
- Standard asbestos preparation involves grinding, but its effect on toxicity is unclear.
Purpose of the Study:
- To investigate if asbestos grinding conditions alter fiber toxicity.
- To evaluate the role of iron content in asbestos-induced toxicity.
Main Methods:
- Chrysotile asbestos was ground with or without water for 5-30 minutes.
- Asbestos-induced reactive oxygen species (ROS) generation in murine macrophages was quantified.
Main Results:
- Dry-ground asbestos fibers exhibited higher toxicity than wet-ground fibers.
- Dry-ground fibers had significantly higher iron content (at least 7 times more).
- Mineralogical properties were not significantly altered by grinding methods.
Conclusions:
- Grinding methods critically influence asbestos fiber surface iron concentration.
- Surface iron levels mediate changes in asbestos-induced ROS generation and toxicity.
- Fiber preparation conditions must be standardized and reported for comparative toxicity studies.
