Magnetic properties of the road dusts from two parks in Wuhan city, China: implications for mapping urban environment

Abstract

Magnetic parameters and heavy metal concentrations of road dusts collected from two parks with distance about 16 km in Wuhan city, China, were measured. The Guishan Park is circled by main roads with heavy traffic, and the Moshan Park is located on the downwind hills of steelworks and a power plant. Mean values of magnetic susceptibility (χ) and saturation magnetization (M (s)) of the dusts from the Moshan Park are 1.31 and 1.57 times those from the Guishan Park, respectively. Their magnetic mineralogy is dominated by pseudo-single domain magnetite; however, minor hematite was also identified in those from the Guishan Park. The dominant sources of non-natural magnetic particles and heavy metals were inferred as windblown emissions from the steelworks and the power plant for the Moshan Park, and road/railway traffics for the Guishan Park, respectively. Spatial variation in magnetic properties of road dust in the two parks and their different magnetic behavior propose that the magnetic measurements are sensitive to the different pollutant origins, as well as the urban environment, and that magnetic techniques have a high efficiency in mapping urban environment. Correlation between magnetic parameters and heavy metal concentrations is strongly site-specific: strong correlations were observed in the Moshan Park with correlation coefficients generally higher than 0.800, whereas correlations are poor in the Guishan Park. Therefore, it is strongly recommended that these relationships should be examined thoroughly before magnetic mapping.

Spatial distribution and ecological risk assessment of trace metals in urban soils in Wuhan, central China

“…Wuhan is the largest metropolis in central China, with fast economic growth, high population density, abundant water resources, strong industrial foundation, and highly developed transportation network. Although several studies about trace metals in soil in this city have been done, most of them were restricted to small specific areas (Qu et al 2013;Yang et al 2011) or water bodies (Jiang et al 2014;Liu et al 2008;Yang et al 2009Yang et al , 2010. For example, Qu et al (2014) recently studied the trace metal contamination status in the Wuhan Donghu High-tech Development Park and assessed the potential ecological risk of trace metals in soil to human health.…”

Spatial Distribution and Risk Assessment of Heavy Metals in Urban Road Dust From Shenyang, a Heavy Industrial City in Northeast China

“…Correlations between heavy metals can reflect their sources and pathways (Yang et al, 2011;Lu et al, 2017a). Pearson correlation analysis results are shown in Table 2.…”

“…The Cu content of road dust may come from engine and brake wear, as well as mechanical abrasion of vehicle parts, while Zn mainly originates from lubricating oil and attrition of automobile tires (Dehghani et al, 2017). Historically, Pb has been an important gasoline additive and although China banned the addition of Pb to gasoline since the early 2000's, Pb has a long half-life and a low leaching rate, leading to its accumulation in urban environments over time (Yang et al, 2011). It has also been reported that Cu, Pb, and Zn are related to industrial activities as they can be released during metal processing and smelting (Dietrich et al, 2018).…”

Tendencias metodológicas en la evaluación del grado de contaminación y de riesgos por metales pesados presentes en sedimentos viales urbanos

“…Gracias a su uso, estos métodos han revelado que las concentraciones de MP en el SV de áreas alrededor de autopistas, industrias, comercios y zonas mixtas presentan elevadas concentraciones, afectando probablemente a los usuarios y residentes de estas zonas [13]- [15]. Existen también otros métodos tales como el grado de contaminación (Cdeg) y el índice de carga multielemento (PLI), que se han utilizado frecuentemente para evaluar de manera integral la contaminación a partir de todos los MP asociados con el SV [16], [17].…”