Digestion device and method for seawater COD (Chemical Oxygen Demand) detection

The invention relates to the technical field of marine monitoring equipment, in particular to a digestion device and method for seawater COD detection, the digestion device comprises a digestion outer sleeve and a digestion inner sleeve, a vertical cylindrical air interlayer is arranged between the digestion outer sleeve and the digestion inner sleeve, and a digestion inner cavity is formed in the digestion inner sleeve; the outer wall of the digestion outer sleeve is a metal shell, the inner wall is a thermal insulation layer, the outer wall of the digestion inner sleeve is a reinforced engineering plastic layer, and the inner wall is a polytetrafluoroethylene layer; an air inlet pipe and an air outlet pipe are arranged on the metal shell and extend into the air interlayer from the outer side wall of the metal shell; when the digestion device starts to work, the polytetrafluoroethylene liquid inlet pipe injects digestion liquid required by reaction into the digestion inner cavity, the magnetron emits microwa