TY - JOUR
T1 - Nanoplastic Analysis by Online Coupling of Raman Microscopy and Field-Flow Fractionation Enabled by Optical Tweezers
AU - Schwaferts, Christian
AU - Sogne, Vanessa
AU - Welz, Roland
AU - Meier, Florian
AU - Klein, Thorsten
AU - Niessner, Reinhard
AU - Elsner, Martin
AU - Ivleva, Natalia P.
N1 - Publisher Copyright:
© 2020 American Chemical Society.
PY - 2020/4/21
Y1 - 2020/4/21
N2 - Nanoplastic pollution is an emerging environmental concern, but current analytical approaches are facing limitations in this size range. However, the coupling of nanoparticle separation with chemical characterization bears potential to close this gap. Here, we realize the hyphenation of particle separation/characterization (field-flow fractionation (FFF), UV, and multiangle light scattering) with subsequent chemical identification by online Raman microspectroscopy (RM). The problem of low Raman scattering was overcome by trapping particles with 2D optical tweezers. This setup enabled RM to identify particles of different materials (polymers and inorganic) in the size range from 200 nm to 5 μm, with concentrations in the order of 1 mg/L (109 particles L-1). The hyphenation was realized for asymmetric flow FFF and centrifugal FFF, which separate particles on the basis of different properties. This technique shows potential for application in nanoplastic analysis, as well as many other fields of nanomaterial characterization.
AB - Nanoplastic pollution is an emerging environmental concern, but current analytical approaches are facing limitations in this size range. However, the coupling of nanoparticle separation with chemical characterization bears potential to close this gap. Here, we realize the hyphenation of particle separation/characterization (field-flow fractionation (FFF), UV, and multiangle light scattering) with subsequent chemical identification by online Raman microspectroscopy (RM). The problem of low Raman scattering was overcome by trapping particles with 2D optical tweezers. This setup enabled RM to identify particles of different materials (polymers and inorganic) in the size range from 200 nm to 5 μm, with concentrations in the order of 1 mg/L (109 particles L-1). The hyphenation was realized for asymmetric flow FFF and centrifugal FFF, which separate particles on the basis of different properties. This technique shows potential for application in nanoplastic analysis, as well as many other fields of nanomaterial characterization.
UR - http://www.scopus.com/inward/record.url?scp=85082655008&partnerID=8YFLogxK
U2 - 10.1021/acs.analchem.9b05336
DO - 10.1021/acs.analchem.9b05336
M3 - Article
AN - SCOPUS:85082655008
SN - 0003-2700
VL - 92
SP - 5813
EP - 5820
JO - Analytical Chemistry
JF - Analytical Chemistry
IS - 8
ER -