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Related Concept Videos

Refrigerators and Heat Pumps01:07

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Refrigerators or heat pumps are heat engines operating in a reverse direction. For a refrigerator, the focus is on removing heat from a specific area, whereas, for a heat pump, the focus is on dumping heat into one particular area. A refrigerator (or heat pump) absorbs heat Qc from the cold reservoir at Kelvin temperature Tc and discards heat Qh to the hot reservoir at Kelvin temperature Th, while work W is done on the engine’s working substance.
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Related Experiment Video

Updated: May 5, 2026

Measurement of Outgassing Rates of Steels
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UDS-test with freon 11 (R-11).

N Winker1, W Klein, P Weniger

  • 1Allgemeine Unfallversicherungsanstalt, Adalben-Stifter-Straße 65, A-1200, Wien, Austria.

Environmental Science and Pollution Research International
|November 16, 2013
PubMed
Summary
This summary is machine-generated.

Trichlorofluoromethane (Freon 11) exposure increased DNA damage in rat lung cells. While spleen and liver cells showed a trend towards increased DNA synthesis, these results were not statistically significant.

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Area of Science:

  • Toxicology
  • Genotoxicity
  • Environmental Health

Background:

  • Trichlorofluoromethane (CFC-11) is an ozone-depleting substance with potential health implications.
  • Understanding the genotoxic potential of CFC-11 is crucial for assessing occupational and environmental risks.
  • The MAK value (Maximale Arbeitsplatz-Konzentration) provides a reference for safe workplace exposure levels.

Purpose of the Study:

  • To investigate the genotoxicity of trichlorofluoromethane (Freon 11) following inhalation exposure in rats.
  • To evaluate unscheduled DNA synthesis (UDS) in pulmonary epithelial cells, hepatocytes, and spleen lymphocytes.
  • To compare exposure levels with established occupational exposure limits (MAK value).

Main Methods:

  • Sprague Dawley rats of both sexes were exposed via inhalation to trichlorofluoromethane at concentrations of 80, 400, 2,000, 10,000, and 50,000 ppm.
  • Unscheduled DNA synthesis (UDS) was assessed in isolated hepatocytes, pulmonary epithelial cells, and spleen lymphocytes.
  • A negative control group was used for comparison.

Main Results:

  • Significant increases in mean silver grain counts, indicative of DNA damage, were observed in pulmonary cells at 2,000, 10,000, and 50,000 ppm.
  • In spleen and liver cells, higher concentrations of trichlorofluoromethane showed a trend towards increased thymidine incorporation into DNA.
  • The observed increases in UDS in spleen and liver cells did not reach statistical significance.

Conclusions:

  • Inhalation exposure to trichlorofluoromethane induces genotoxic effects in rat pulmonary epithelial cells.
  • The study suggests a potential, though not statistically confirmed, impact on DNA synthesis in spleen and liver cells.
  • Results highlight the need for caution regarding occupational exposure to trichlorofluoromethane, especially at concentrations exceeding MAK values.