Liquid nitrogen safety in a laboratory or clinical environment requires a structured approach encompassing engineering controls, administrative procedures, and personal protective equipment appropriate to the specific tasks performed. Before any work involving liquid nitrogen, employers are required to identify the hazards present and put in place controls sufficient to reduce risk to as low as is reasonably practicable.
Cryogenic gloves are an essential component of the personal protective equipment specification for liquid nitrogen handling. Standard laboratory nitrile or latex gloves provide no meaningful thermal protection against cryogenic liquids and must not be used when handling liquid nitrogen or liquid nitrogen-charged vessels. Purpose-designed cryogenic gloves are constructed from multilayer insulating materials rated to withstand brief contact with liquid nitrogen at minus 196 degrees Celsius. Cryogenic gloves should be loose-fitting to allow rapid removal if liquid nitrogen enters the glove, and should be complemented by a full-face shield or safety spectacles, non-absorbent footwear, and a laboratory coat or protective apron.
Additional liquid nitrogen safety controls required for UK laboratory settings include continuous atmospheric oxygen monitoring with audible alarms, mechanical ventilation in rooms where liquid nitrogen is stored or used, and prohibition on transporting unsealed liquid nitrogen dewars in passenger lifts. Documented emergency procedures for spill response and personnel injury must be in place before liquid nitrogen handling begins. Cryolab supplies UKCA and CE marked cryogenic storage vessels designed to minimise liquid nitrogen handling requirements in clinical settings. Further guidance is available at cryolab.co.uk.
