▎ 摘　　要

NOVELTY - Adsorbent film is formed from a solution, where solution in turn prepared from raw materials comprising graphene power and/or modified graphene powder, collodion solution, and dispersing agent. The modified graphene powder is ammonia-modified graphene oxide powder or sulfuric acid-modified graphene oxide powder, both of which are prepared in accordance with an impregnation method, or a combination, and each of the graphene powder and the modified graphene powder has a particle size within a range of 50 to 150 mu m. The dispersing agent is sodium dodecyl benzene sulfonate, polyvinylsulfonate, or polyvinyl alcohol. USE - Adsorbent film used for measurement of scale content in wastewater by coating film forming solution onto wall of vessel for holding sample of wastewater (claimed). ADVANTAGE - The adsorbent film is used in measurement of the scale content in wastewater, which effectively avoid measurement error caused by the crystals that are deposited on the vessel wall and fail to be taken into account by the conventional static method. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing adsorbent film, involves: (A) allowing film forming solution to dry or is dried to form the adsorbent film on the wall; (B) introducing into the vessel the wastewater sample to conduct a reaction at 35-70 degrees C for 60-80 hours while the wastewater in the vessel is vibrated at a frequency of 15-40 times per minute, after completion of the reaction, pouring the wastewater sample out of the vessel, followed by washing of the adsorbent film with clear water and then removal; and (C) drying the film under vacuum and weighing for calculating the scale content, which is the difference between the weight of the film before the reaction and the weight after the reaction.