Related Experiment Videos
Environmental Conditions in a Chamber with Dry Ice
James E. Artwohl1, Mark Kovacs, B. Taylor Bennett
1University of Illinois at Chicago, Biologic Resources Laboratory, 1840 W. Taylor Street, M/C 533, Chicago, IL 60612-7348.
Contemporary Topics in Laboratory Animal Science
|June 28, 2002
Summary
This study found that 500g of dry ice is needed for effective rodent euthanasia in a bell jar. Replacing the lid for one minute between animals ensures optimal carbon dioxide (CO2) levels.
Area of Science:
- Laboratory Animal Science
- Veterinary Medicine
- Environmental Monitoring
Background:
- Dry ice is commonly used in research for rodent euthanasia, providing a source of carbon dioxide (CO2).
- Standard laboratory procedures require evaluation of environmental conditions during euthanasia to ensure efficacy and adherence to guidelines.
- Optimizing CO2 delivery and maintenance is crucial for humane animal research practices.
Purpose of the Study:
- To assess the environmental conditions within a standard 9-liter bell jar when using dry ice for rodent euthanasia.
- To determine the optimal quantity of dry ice required to achieve recommended CO2 concentrations.
- To evaluate the impact of repeated use and lid removal on chamber conditions.
Main Methods:
- Utilized a portable gas analyzer to measure CO2 levels at 7.5 cm above the platform within a 9-liter bell jar.
- Measured ambient chamber temperature and platform temperature over an 80-minute period.
- Quantified the dry ice necessary to achieve and maintain a 70% CO2 concentration, simulating euthanasia conditions.
Main Results:
- A minimum of 500g of dry ice was required to maintain CO2 levels recommended by the American Veterinary Medical Association Panel on Euthanasia.
- Replacing the bell jar lid for 1 minute between animal removals is recommended to sustain adequate CO2 concentration.
- While chamber ambient temperature remained above 17°C, the platform temperature dropped to 0°C during the study period.
Conclusions:
- The study provides specific recommendations for using dry ice in a bell jar for rodent euthanasia, emphasizing the quantity of dry ice and chamber management.
- Findings suggest that for prolonged use (over 1 hour), alternating between two chambers is advisable to allow for temperature recovery and consistent CO2 levels.
- Proper environmental monitoring and adherence to recommended procedures are essential for humane and effective euthanasia in laboratory settings.