Heavy metals speciation analysis was carried out on sediment samples accumulated within soakaways in an old stormwater infiltration facility in Tokyo, Japan and on a soil core sample collected near the facility. Heavy metals content in soakaways sediments were much elevated compared to nearby surface soil with the content for Zn, Pb and Cd reaching about 5 to 10 times the content in surface soil. Speciation results revealed that significant amount of the accumulated heavy metals were present in potential mobile fractions, posing threat of release to underlying soil with changing environmental conditions. Detail analyses of soil characteristics indicated significant heterogeneity with depth, especially between the surface soil and underlying soil at site. Decrease in potential adsorption sites with depth was observed in case of underlying soil. Reduced adsorption capacity for heavy metals was evidenced for underlying soil when compared with surface soil. Furthermore, less capability of the soil organic matter to bind heavy metals was evidenced through speciation analyses, which raises concern over the long-term pollution retention potential of the underlying soil receiving infiltrated runoff.
"The residues on filters were investigated for VSS, PAHs and heavy metals. VSS were measured by heating the sediment at 450˚C for 15 min . Selected event samples were used for PAH and heavy metals analysis. "
[Show abstract][Hide abstract] ABSTRACT: Road run-off water quality can be significantly impacted by many pollutants deposited on road surfaces through vehicular activities. Any control strategy for the improvement of water quality relating to organic and inorganic pollutants should be based on a detailed knowledge of pollutant built-up processes and the relationship of pollutants to one another. Total volatile suspended solids (VSS), polycyclic aromatic hydrocarbons (PAHs) and heavy metals were estimated in total suspended solids (TSS) collected in two catchments. This study found a good relationship between total VSS and TSS and between TSS and PAHs. This relationship information can be utilized for the development of effective Best Management Practices for TSS control. However, the relationship between TSS and heavy metals was identified as being strong in only some cases.
Desalination and water treatment 05/2015; 54(4-5). DOI:10.1080/19443994.2014.955827 · 1.17 Impact Factor
"Sample collection and treatment Hossain et al. (2007) observed significant differences between surface and underlying soil at the site. Even through the surface soil does not receive infiltrated runoff from the facilities (Figure 1), the sharp difference in "
[Show abstract][Hide abstract] ABSTRACT: Accumulation of heavy metals at elevated concentration and potential of considerable amount of the accumulated heavy metals to reach the soil system was observed from earlier studies in soakaways sediments within an infiltration facility in Tokyo, Japan. In order to understand the competitive adsorption behaviour of heavy metals Zn, Ni and Cu in soil, competitive batch adsorption experiments were carried out using single metal and binary metal combinations on soil samples representative of underlying soil and surface soil at the site. Speciation analysis of the adsorbed metals was carried out through BCR sequential extraction method. Among the metals, Cu was not affected by competition while Zn and Ni were affected by competition of coexisting metals. The parameters of fitted 'Freundlich' and 'Langmuir' isotherms indicated more intense competition in underlying soil compared to surface soil for adsorption of Zn and Ni. The speciation of adsorbed metals revealed less selectivity of Zn and Ni to soil organic matter, while dominance of organic bound fraction was observed for Cu, especially in organic rich surface soil. Compared to underlying soil, the surface soil is expected to provide greater adsorption to heavy metals as well as provide greater stability to adsorbed metals, especially for Cu.
"A majority of recent works on concerning sediment metal pollution focuses on potential mobility of sediment bound metals on the basis of speciation results derived through application of widely used sequential extraction schemes (e.g., Durand, 2004; e.g., Hossain et al., 2007, etc.). The other studies focus on vulnerability to some specific environmental stress or events like long term inundation or water logging or low pH runoff water reaching the soakaways (e.g., Emmerson et al., 2000; Murakami et al., 2008, etc.). "
[Show abstract][Hide abstract] ABSTRACT: Soakaways sediment samples, differentiated on the basis of accumulated sediment depth, were collected from an infiltration facility in Tokyo, and subject to heavy metals content and speciation analysis for the metals Cr, Ni, Zn, Cu, Cd and Pb. The heavy metals content were found several times higher in sediments compared to surface soil indicating considerable pollution from Zn, Cd and Pb present in runoff. The percentages of heavy metals existing in mobile fractions were significantly higher in sediment samples than soil even when contents were comparable signifying the role of environmental processes occurring within the soakaways. The sediment samples were subject to batch leaching experiments to assess the vulnerability of adsorbed metals in soakaways sediments while interacting with road runoff water under different acid rain scenarios. Only Zn and Cu in sediments exhibited significant desorption. Zn desorption showed rapid increasing tendency with increasing acidity in rainwater. Positive relationship was observed between accumulated sediment depth and heavy metals content as well as relative proportion of the mobile fractions. The vulnerability of the bound heavy metals to increasing acidity in rainwater was greater for sediment samples corresponding to high accumulated sediment depth.
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