Methylene blue and characterization of activated carbon adsorption value another important indicator of liquid phase adsorption performance.Together with iodine value evaluation of liquid phase adsorption of activated carbon.Because of methylene blue molecular diameter greater than iodine molecular diameter, so the iodine value is commonly used in characterization of activated carbon microporous quantity, using methylene blue hole quantity in the characterization of activated carbon.Specified in GB/T 7702. 6-1997 of the methylene blue test method is said to take a certain amount of grinding, drying of the activated carbon samples and make a good mix of known concentration of methylene blue solution absorption, filtered using spectrophotometer of filtrate wavelength in the 6655 m and absorbance, and copper sulfate standard color liquid aqueous solution (mass fraction 0.4%), the absorbance of phase contrast, adjust the amount of methylene blue solution, until the measured sample filtrate and copper sulfate standard color difference is not more than 0.02 soil solution's absorbance readings.Calculate the per gram of activated carbon adsorption of methylene blue quality (mg).