Differentiating and quantifying carbonaceous (tire, bitumen, and road marking wear) and non-carbonaceous (metals, minerals, and glass beads) non-exhaust particles in road dust samples from a traffic environment
Journal article, 2022

Tires, bitumen, and road markings are important sources of traffic-derived carbonaceous wear particles and microplastic (MP) pollution. In this study, we further developed a machine-learning algorithm coupled to an automated scanning electron microscopy/energy dispersive X-ray spectroscopy (SEM/
EDX) analytical approach to classify and quantify the relative number of the following subclasses contained in environmental road dust: tire wear particles (TWP), bitumen wear particles (BiWP), road markings, reflecting glass beads, metallics, minerals, and biogenic/organics. The method is non-destructive, rapid, repeatable, and enables information about the size, shape, and elemental composition of particles 2–125 μm.

The results showed that the method enabled differentiation between TWP and BiWP for particles > 20 μm with satisfying results. Furthermore, the relative number concentration of the subclasses was similar in both analyzed size fractions (2–20 μm and 20–125 μm), with minerals as the most dominant subclass (2–20 μm x̄ = 78%, 20–125 μm x̄ = 74%) followed by tire and bitumen wear particles, TBiWP, (2–20 μm x̄ = 19%, 20–125 μm x̄ = 22%). Road marking wear, glass beads, and metal wear contributed to x̄ = 1%, x̄ = 0.1%, and x̄ = 1% in the 2–20-μm fraction and to x̄ = 0.5%,
x̄ = 0.2%, and x̄ = 0.4% in the 20–125-μm fraction.

The present results show that road dust appreciably consists of TWP and BiWP within both the coarse and the fine size fraction. The study delivers quantitative evidence of the importance of tires, bitumen, road marking, and glass beads besides minerals and metals to wear particles
and MP pollution in traffic environments based on environmental (real-world) samples

Field samples

Road dust differentiation

TRWP

Machine learning

Tire wear particles

Automated single-particle SEM/EDX analysis

Author

Ida Järlskog

The Swedish National Road and Transport Research Institute (VTI)

Chalmers, Architecture and Civil Engineering, Geology and Geotechnics

David Jaramillo-Vogel

Particle Vision

Juanita Rausch

Particle Vision

Sébastien Perseguers

Gradiom Sàrl

Mats Gustafsson

The Swedish National Road and Transport Research Institute (VTI)

Ann-Margret Hvitt Strömvall

Chalmers, Architecture and Civil Engineering, Water Environment Technology

Yvonne Andersson-Sköld

The Swedish National Road and Transport Research Institute (VTI)

Chalmers, Architecture and Civil Engineering

Water, Air, and Soil Pollution

0049-6979 (ISSN) 1573-2932 (eISSN)

Vol. 233 9

Load and measures to reduce the load of traffic related persistent organic pollutants (POP) and micro/nanoplastics

The Swedish National Road and Transport Research Institute (VTI), 2019-01-01 -- 2021-12-31.

Formas (2017-00720), 2019-01-01 -- 2021-12-31.

Subject Categories

Analytical Chemistry

Earth and Related Environmental Sciences

DOI

10.1007/s11270-022-05847-8

More information

Latest update

9/27/2022