Phosphorus bromide is a light yellow smoke colorless liquid, pungent odor, corrosive. Can dissolve in acetone, bisulfide, chloroform, carbon tetrachloride. Currently used for chemical analysis and organic synthesis, or as catalysts. Phosphorus trioxide has a strong irritant to the eyes, skin, mucous membranes and respiratory tract. After inhalation, ingestion or skin contact, the human body produces a burning sensation, cough, wheezing, laryngitis, shortness of breath, headache, nausea and vomiting.