Method for determining phenolic compounds in water

The invention belongs to the technical field of environment detection (monitoring), and particularly relates to a method for determining phenolic compounds in water. According to the method, the extraction liquid obtained through liquid-liquid extraction is subjected to nitrogen blowing concentration, the concentration multiple is greatly reduced in the nitrogen blowing concentration process as long as a target detection object in the concentrated extraction liquid reaches the detection limit or above, and then the concentrated extraction liquid is diluted and subjected to phase change through acetone; acetone dilution and phase change are matched with subsequent ultrasonic-assisted derivatization treatment, so that the pretreatment time can be shortened, the efficiency can be improved, the nitrogen blowing concentration loss of the low-boiling-point phenolic compound can be effectively avoided, the detection accuracy is improved, and the problem of low recovery rate of the low-boiling-point compound caused b