Absorption and Accumulation of Heavy Metal Pollutants in Roadside Soil-Plant Systems - A Case Study for Western Inner Mongolia

Xi'an-Baoji Highway is one of the oldest and most important highways in northwest China. In this study, the concentrations (0-20 cm) of Pb, Zn, Cu and Cr at 5-1000 m distances in the roadside soils along Xi'an-Baoji Highway were experimentally determined to analyze their spatial distribution and evaluate their contamination levels. The spatial distribution (mg·kg -1 ) of Pb, Zn, Cu and Cr at 5-1000 m distances from the both roadsides (North/South) is, respectively, 23. 81-38.45/24.54-36.90, 72.79-121.98/ 76.91-130.60, 24.58-41.60/23.82-37.31, and 63.83-85.26/64.30-85.94 at Chencang District section, while it is 23. 41-45.76/20.95-42.50, 74.62-135.54/75.15-127.25, 23.94-35.71/22.04-36.91, and 63.82-85.84/64.33-88.53, respectively, at Caijiapo section. Regarding the Pb, Zn, Cu and Cr at Mei County section, it is 25. 47-40.89/23.56-32.72, 74.15-131.24/72.67-118.15, 24.00-37.61/25.68-44.99, and 64.00-89.22/61.90-85.58, respectively. Integrated evaluation via the contamination factor (C f ), contamination degree (C d ) and pollution level index (PLI) showed the moderate pollution level. While geoaccumulation index (I geo ) revealed that all evaluated metals were almost unpolluted (0＜I geo ), only part heavy metal of individual sampled sites were unpolluted to moderately polluted (0≤I geo ＜1). The correlation analysis shown these metals are significantly associated with each other. Interelement correlation is as follows: Pb-Cr＞Pd-Cu＞Zn-Cu＞Pd-Zn＞Zn-Cr＞Cu-Cr. Moreover, the hierarchical cluster analysis suggested that Pb and Zn might be from the identical anthropogenic and natural source while Zn and Cr might have the same original source in the roadside soils along Xi'an-Baoji Highway in Northwest China.

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Ecological risk assessment of some heavy metals in roadside soils at traffic circles in Gombe, northern Nigeria

Sulaiman¹,

Santuraki²,

Babayo³

2018

Journal of Applied Sciences and Environmental Management

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The study evaluated the levels of some heavy metals in the roadside soils at different traffic circles using geo-accumulation index, ecological risk and Hakanson method to assess the overall ecological risk and identify ecological potential risk of heavy metals pollution. The top soil samples were collected at three different traffic circles from edge and at 50 m distance from the roadside, and analysed for heavy metal (Pb, Cd, Cu and Zn) using atomic absorption spectrophotometer. The mean concentrations of heavy metals (mg/kg) ranged from (15.0-45.07) Pb, (0.35-2.60) Cd, (19.05-38.0) Cu and (58.10-101.0) Zn. The abundance of metals was found in declining order: Zn > Pb > Cu > Cd. The metals concentrations were found to be higher in the soil samples from edge due to high traffic volume and human activities, and there was significantly decrease in concentration with increase in roadside distance. The Geoaccumulation index (Igeo) examined in this study revealed that soil samples from edge and 50 m distance from the roadside were polluted with cadmium. Ecological risk assessment carried out showed that the metals posed low ecological risk and cadmium contributed 66.63-94.21% of the total potentially ecological risk.

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Absorption and Accumulation of Heavy Metal Pollutants in Roadside Soil-Plant Systems - A Case Study for Western Inner Mongolia

Cited by 3 publications

References 11 publications

Soil heavy metals contamination and ecological risk assessment in Rohtak urban area, Haryana (India)

Soil heavy metals contamination and ecological risk assessment in Rohtak urban area, Haryana (India)

Assessment of Spatial Distribution and Pollution With Heavy Metals in Roadside Soils Along Xi'an-Baoji Highway in Northwest China

Ecological risk assessment of some heavy metals in roadside soils at traffic circles in Gombe, northern Nigeria

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