US 12,247,916 B2
Identification method of plastic microparticles
Chihhao Fan, Taipei (TW); Jhen-Nan Lin, Taipei (TW); Jun-Wei Li, Taipei (TW); and Ya-Zhen Huang, Taipei (TW)
Assigned to National Taiwan University, Taipei (TW)
Filed by National Taiwan University, Taipei (TW)
Filed on Jun. 7, 2022, as Appl. No. 17/833,936.
Claims priority of application No. 111101852 (TW), filed on Jan. 17, 2022.
Prior Publication US 2023/0228678 A1, Jul. 20, 2023
Int. Cl. G01N 33/00 (2006.01); G01J 3/42 (2006.01); G01N 21/3563 (2014.01); G01N 33/44 (2006.01); G01J 3/28 (2006.01); G01N 21/35 (2014.01)
CPC G01N 21/3563 (2013.01) [G01J 3/42 (2013.01); G01N 33/442 (2013.01); G01J 2003/2859 (2013.01); G01N 2021/3595 (2013.01)] 5 Claims
OG exemplary drawing
 
1. An identification method of plastic microparticles, comprising:
performing a solvent extraction on the plastic microparticles to extract a part of plastics; and
performing an infrared analysis on the extracted plastic microparticles and crystals from an extract liquid obtained by the solvent extraction to identify whether the extracted plastic microparticles comprise at least one plastic selected from a group consisting of polyethylene terephthalate, polyethylene, polypropylene and nylon 66, and whether the crystals comprise polyvinyl chloride,
wherein the identification is to determine whether the extracted plastic microparticles and the crystals have characteristic peaks of each of the at least one plastic, and the characteristic peaks are selected from signals that do not overlap and interfere with each other among infrared spectral signals of each of the at least one plastic,
wherein the characteristic peak of the polyethylene terephthalate is at 793±5 cm−1, the characteristic peaks of the polyethylene are selected as two peaks that do not overlap at 1472±5 cm−1 and 1462±5 cm−1, the characteristic peak of the polypropylene is at 841±5 cm−1, the characteristic peak of the nylon is at 3295±5 cm−1, and the characteristic peak of the polyvinyl chloride is at 712±5 cm−1.