Several metals are found in tears, albeit in trace amounts. The specific metals present and their concentrations can vary depending on factors like individual health, environment, and even the type of tears being analyzed (e.g., basal tears vs. reflex tears).
Metals Commonly Found in Tears
Research indicates that tears contain various trace elements including:
- Zinc: Studies have measured zinc levels in tears, with one study reporting a mean level of 1.537 ppm (PubMed).
- Copper: Found in higher concentrations in tears from individuals in rural areas compared to urban areas, according to a study comparing trace element levels in tears from both groups. (MDPI)
- Chromium: Similar to copper, chromium shows higher levels in tears from rural populations in the same study. (MDPI)
- Iron: Also present in tears, with higher concentrations observed in rural populations in the aforementioned study. (MDPI)
- Aluminum: This metal has been detected in tears, with higher concentrations found in rural groups compared to urban groups. (MDPI)
- Potassium, Titanium: These are other trace elements detected in tears. (MDPI)
It's important to note that the presence and concentrations of these metals can be influenced by various factors. Further research is needed to fully understand the significance of these metallic components in tear fluid.
