What is the appropriate first step if a patient has powdered agricultural product spilled on their arms and complains of burning?

The appropriate first step when dealing with a patient who has a powdered agricultural product spilled on their skin and is experiencing burning sensations is to brush off the substance. Many powders, particularly agricultural chemicals, can continue to react with moisture, which may only exacerbate the situation if water is applied immediately. By brushing off the powder, you help to remove as much of the harmful substance as possible before proceeding with further decontamination.

In emergency situations involving chemicals, the primary goal is to limit the contact of the substance with the skin. Water applied too soon could activate certain chemicals, leading to further injury. Once the bulk of the powder is removed, rinsing with copious amounts of water can then be safely performed.

Following this initial step, other supportive measures can be undertaken, such as monitoring for symptoms or applying dressings if wounds form, but the removal of the substance is crucial in preventing further harm.