Upon detection of phosphorus oxychloride poisoning, the following measures should be taken immediately:

Quickly move the patient to an area with fresh air and ensure the airway remains unobstructed.

Remove contaminated clothing and flush the affected areas with copious amounts of water.

Seek medical attention immediately and inform the physician of the details regarding the exposure.

In summary, phosphorus oxychloride is a highly toxic chemical; its handling and use must strictly adhere to safety regulations. We must fully understand its hazards and implement appropriate protective measures to ensure personal safety and environmental protection.