Characteristics of potentially toxic elements and multi-isotope signatures (Cu, Zn, Pb) in non-exhaust traffic emission sources

Hyeryeong Jeong; Jong-Sik Ryu; Kongtae Ra

doi:10.1016/j.envpol.2021.118339

Characteristics of potentially toxic elements and multi-isotope signatures (Cu, Zn, Pb) in non-exhaust traffic emission sources

Environ Pollut. 2022 Jan 1;292(Pt A):118339. doi: 10.1016/j.envpol.2021.118339. Epub 2021 Oct 9.

Authors

Hyeryeong Jeong¹, Jong-Sik Ryu², Kongtae Ra³

Affiliations

¹ Marine Environmental Research Center, Korea Institute of Ocean Science and Technology (KIOST), Busan, 49111, Republic of Korea; Department of Ocean Science (Oceanography), KIOST School, University of Science and Technology (UST), Daejeon, 34113, Republic of Korea.
² Department of Earth and Environmental Sciences, Pukyong National University, Busan, 48513, Republic of Korea.
³ Marine Environmental Research Center, Korea Institute of Ocean Science and Technology (KIOST), Busan, 49111, Republic of Korea; Department of Ocean Science (Oceanography), KIOST School, University of Science and Technology (UST), Daejeon, 34113, Republic of Korea. Electronic address: ktra@kiost.ac.kr.

PMID: 34637824
DOI: 10.1016/j.envpol.2021.118339

Abstract

Non-exhaust emissions (e.g., particles from brake pads, asphalt, curb, road paint, tire) are important sources of potentially toxic elements (PTEs) pollution in urban environments and are potential causes of PTEs pollution in road dust. We present the PTEs concentrations (Cr, Ni, Cu, Zn, As, Cd, Sn, Sb, Pb) of non-exhaust emission sources and pollution degree of PTEs. Isotopic signatures of Cu, Zn, and Pb were also analyzed to distinguish these sources. Among PTEs, the Cu concentration in all brake pads was significantly high and brake pads from Korea showed remarkably high Sb concentrations. Asphalt had a higher Pb concentration than other non-exhaust emission sources. Mean of δ⁶⁵Cu_AE647, δ⁶⁶Zn_IRMM3702, and ²⁰⁶Pb/²⁰⁷Pb values of non-exhaust emission sources in this study ranged from -0.49‰ to +0.19‰, -0.24‰ to +0.16‰, and 1.1535 to 1.4471, respectively. Non-exhaust emission sources could be discriminated by plotting the concentration and isotopic composition of Cu. Cu isotopic compositions (δ⁶⁵Cu_AE647) were clearly distinguished between brake pads including domestic and imported products and tires. Zn isotope values (δ⁶⁶Zn_IRMM3702) of brake pads, tires, and asphalt overlapped, but discriminated from road paint and curb. Our results indicate that the combination of Cu and Zn isotopic signatures can distinguish various non-exhaust traffic emissions, especially brake pads and tires.

Keywords: Brake pad; Multi-isotopes; Tire; Tracing pollution sources; Urban pollution.

MeSH terms

Dust / analysis
Environmental Monitoring
Environmental Pollution
Isotopes
Lead*
Metals, Heavy* / analysis
Risk Assessment
Zinc

Substances

Dust
Isotopes
Metals, Heavy
Lead
Zinc