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Water and Heavy Metal Transport in Roadside Soils 被引量:26
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作者 B. KOCHER G. WESSOLEK H. STOFFREGEN 《Pedosphere》 SCIE CAS CSCD 2005年第6期746-753,共8页
Roads with very high traffic loads in regions where soils are low in both pH and sorption capacity might be a source of percolation water loaded with heavy metals. Looking at some "worst case" scenarios, thi... Roads with very high traffic loads in regions where soils are low in both pH and sorption capacity might be a source of percolation water loaded with heavy metals. Looking at some "worst case" scenarios, this study focused on the input of traffic related pollutants and on Pb, Cd, Cu, Zn, Ni and Cr concentrations in the soil matrix and soil solution, respectively. The analysis also included pH and electrical conductivity and at some sites DOC. The investigations were carried out on sandy soils with more or less low pH values at four motorway sites in Germany. The average of daily traffic was about 50 000 up to 90 000 vehicles. Soil pore water was collected in two soil depths and at four distances from the road. The pH in general decreased with increasing distance from the roadside. The elevated pH near the roadside was presumably caused by deposition of dust and weathering residues of the road asphalt, as well as by infiltration of salt that was used during winter time. At these road sites, increased heavy metal concentrations in the soil matrix as well as in the soil solution were found. However, the concentrations seldom exceeded reference values of the German Soil Protection Act. The soil solution concentrations tended to increase from the road edge to 10 m distance, whereas the concentration in the soil matrix decreased. Elevated DOC concentrations corresponded with elevated Cu concentrations but did not substantially change this tendency. High soil water percolation rates were found near the roads. Thus, even low metal concentrations of percolation water could yield high metal loads in a narrow area beside the road. 展开更多
关键词 heavy metals percolation water roadside soils TRAFFIC
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Concentrations of anthropogenic Pt and Pd in urban roadside soils in Xuzhou,China 被引量:1
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作者 Xuesong WANG Cheng SUN 《Frontiers of Environmental Science & Engineering》 SCIE EI CSCD 2008年第4期475-479,共5页
The potential accumulation of platinum group elements(PGE)in the environment from automobile catalysts is high in urban areas,with the major sinks being roadside soils.Therefore,this investigation presented the detail... The potential accumulation of platinum group elements(PGE)in the environment from automobile catalysts is high in urban areas,with the major sinks being roadside soils.Therefore,this investigation presented the detailed study on characterized concentrations of Pt and Pd and their enrichment ratios in urban roadside soils in Xuzhou,China in March 2003.Data from 21 roadside topsoil samples analyzed by inductively coupled plasmamass spectrometer(ICP-MS)illustrated that the medians of concentrations of Pt and Pd were 2.9 and 2.8 ng/g,respectively.Hierarchical clustering analysis indicated that Pt and Pd were mainly from traffic emissions.Compared to unpolluted soils,computation of Pt and Pd enrichment ratios suggested that the Xuzhou roadside soils had average enrichment factors of 3.53 for Pt(in range of 1.22–5.73)and of 3.37 for Pd(in range of 1.35–4.46).Lower Pt/Pd ratios(in range of 0.35–2.86)in relation to similar studies in other countries were observed,which might be due to the different Pt/Pd ratios in Chinese automobile catalytic converters.Moreover,fine fraction(,250 mm)contained higher concentrations of Pt and Pd compared to the coarse fraction(250–500 mm). 展开更多
关键词 platinum PALLADIUM ENRICHMENT contamination urban roadside soil hierarchical cluster analysis Xuzhou of China
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Magnetic Properties as Indicators of Cu and Zn Contamination in Soils 被引量:7
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作者 LU Sheng-Gao BAI Shi-Qiang FU Li-Xia 《Pedosphere》 SCIE CAS CSCD 2008年第4期479-485,共7页
Concentrations of copper (Cu) and zinc (Zn) and various magnetic parameters in contaminated urban roadside soils were investigated using chemical analysis and magnetic measurements. The results revealed highly ele... Concentrations of copper (Cu) and zinc (Zn) and various magnetic parameters in contaminated urban roadside soils were investigated using chemical analysis and magnetic measurements. The results revealed highly elevated Cu and Zn concentrations as well as magnetic susceptibility in the roadside soils. The mean concentrations of Cu and Zn in these roadside soils were almost twice those in average Chinese soils, with the mean magnetic susceptibility of the roadside soils reaching about 179 ×10^-8 m^3 kg^-1. This enhanced magnetic susceptibility was attributed to the presence of anthropogenic soft ferrimagnetic particles. A low frequency-dependent susceptibility (2.5%± 1.0%) observed in the roadside soils indicated the coarse multidomain (MD) ferrimagnetic grains to be the dominant contributor to magnetic susceptibility. The Cu and Zn concentration of the soils had highly significant linear correlations with magnetic susceptibility (P 〈 0.01), anhysteretic remanent magnetization (P 〈 0.01), and saturation isothermal remanent magnetization (P 〈 0.01). This suggested that heavy metals were associated with ferrimagnetic particles in soils, which were attributed to input of traffic emissions and industrial activities. Scanning electron microscopy and energy dispersive X-ray spectra of magnetic extracts of the roadside soils further suggested the llnk between the magnetic signal and concentrations of heavy metals. Thus, the magnetic parameters could provide a proxy measure for the level of heavy metal contamination and could be a potential tool for the detection and mapping of contaminated soils. 展开更多
关键词 ferrimagnetic minerals heavy metals magnetic susceptibility roadside soils
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