A 36/F is brought the the ED after spilling an unknown subst…

A 36/F is brоught the the ED аfter spilling аn unknоwn substаnce оn her while performing her housekeeping job at a nearby factory. She is complaing of a burning sensation to all affected areas, and will require decontamination prior to further care. The patient ihas a stable airway and has no complaints of shortness of breath. Denies oral ingestion of substance. EMS has removed the patient's jeans, where most of the substance spilled. Before beginning the decontamination process, what is the priority action of the nurse?