US Patent 11360006 Method for separating microplastics from animal excrement

A method for separating microplastics from an animal feces, the method including: 1) freeze-drying an animal fecal sample; 2) transferring the animal fecal sample dried in 1) into a beaker, adding a Fenton's reagent; stirring a mixture of the animal fecal sample and the Fenton's reagent until no bubbles were produced; constantly adding the Fenton's reagent to the mixture; filtering the mixture through a plurality of cellulose nitrate-cellulose acetate (CN-CA) membranes, and transferring the plurality of CN-CA membranes into a plurality of 500 mL beakers; adding 100 mL of 65% HNO