80%。 Acetic acid activated biomass charcoal is a porous solid particulate matter. At the temperature of 20 degrees Celsius, the concentration of the substance refers to the ratio of the mass of acetic acid activated biomass charcoal contained in the solution to the total mass of acetic acid activated biomass charcoal solution, and the concentration of the substance is calculated to be 80%. This material contains a lot of carbon and plant nutrients, with rich pore structure, large specific surface area and many oxygen-containing active groups on the surface, so it is a multifunctional material.