▎ 摘　　要

NOVELTY - Preparing a graphene oxide modified magnetic polypropylene imine polymer material comprises mixing iron salt and ammonia water and heating to reacting to obtain magnetic nanoparticles, where the magnetic nanoparticles are modified with amino groups to obtain amino-modified magnetic nanoparticles, grafting the amino-modified magnetic nanoparticles with n-generation polypropylene imine polymers to obtain magnetic nanoparticles grafted with different generations of polypropylene imine polymers, using N-hydroxysuccinimide and 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride to activate graphene oxide and polymerizing the activated product with polypropylene imine, carrying out the reaction on the magnetic nano-particles grafted with the substance, magnetically separating the reaction product, cleaning and drying, where the value of n is 1 or 2. USE - The material is useful as solid phase extraction adsorbent in the magnetic solid phase extraction detection of polychlorinated biphenyl in environmental water sample (claimed). ADVANTAGE - The material: has excellent linear relationship with correlation coefficient. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) graphene oxide modified magnetic polypropylene imine polymer material prepared y the above mentioned method; and (2) detecting polychlorinated biphenyls in environmental water samples by magnetic solid phase extraction comprising using the graphene oxide modified magnetic polypropylene imine polymer material as solid phase extraction, dispersing the adsorbent in the test sample solution containing PCBs and adding sodium chloride to the solution at the same time at the constant temperature oscillation reaction, separating the solid phase extraction adsorbent by an external magnetic field and eluting the solid phase extraction adsorbent by ethanol, PCBs, and detect PCBs by high performance liquid chromatography, preferably, the ratio of the amount of the graphene oxide modified magnetic polypropylene imine polymer material and sample solution to be tested is (30-90) mg: (30-100) ml, preferably, the mass concentration of the sodium chloride in the sample solution to be tested is 5-28%, preferably, the temperature for performing solid phase extraction is 15-35 degrees C and the speed of constant temperature oscillation is 100-300 rotations/minute (rpm) and the time is 20-60 minutes.