What is the function of a sorbent used with an air purifying respirator?

The function of a sorbent used with an air purifying respirator is primarily to remove chemical contaminants from inhaled air. Sorbents are materials that have a high affinity for specific gases or vapors, allowing them to chemically or physically capture these harmful substances from the ambient air as it passes through the respirator.

By using sorbents, the respirator effectively filters out pollutants, ensuring that the person wearing the mask breathes cleaner air. This is crucial in environments where certain harmful chemicals are present, as it helps protect the respiratory system from potential damage or toxic exposure.

The other options do not reflect the primary role of a sorbent in an air purifying respirator. For example, while a respirator may provide a barrier from contaminants, this function is typically associated with the respirator's physical filter rather than a sorbent's chemical action. Enhancing breathing resistance and increasing filter lifespan are not direct functions of a sorbent; these factors are more about the design and condition of the respirator as a whole.