CMP, UA, EKG, CXR (if inhalational)
Serum phosphorus level NOT helpful in diagnosing (though may want to monitor if concern for other electrolyte abnormalities)
Consider EGD if concern for GI burns
Phosphorus toxicity
Aluminum toxicity
Salicylate toxicity
Antimony toxicity
Organophosphate toxicity
Arsenic toxicity
White phosphorus toxicity
Barium toxicity