Evaluation of Metal Mobility and Bioaccessibility in Soils of Urban Vegetable Gardens Using Sequential Extraction

Szolnoki, Zsuzsanna; Farsang, Andrea

doi:10.1007/s11270-013-1737-4

Cited by 46 publications

(27 citation statements)

References 36 publications

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“…This effect demonstrates a high affinity of Pb to organic matter and is in line with the commonly accepted theory that it is chelation by low molecular weight compounds rather than acidification that determines the high solubility of anthropogenic Pb in acid forest soils (Tyler 1978;Steinnes and Friedland 2006). High shares of the mobile (F1) and potentially soluble (F2) fractions of Pb in ectohumus, which reach up to 50% in the Oi horizon of the I/1 profile, confirm an anthropogenic origin of the Pb in these soils (Abollino et al 2002b;Lu et al 2003;Neel et al 2007;Agbenin et al 2010;Szolnoki and Farsang 2013).…”

Section: Resultssupporting

confidence: 84%

The distribution of sequentially extracted Cu, Pb, and Zn fractions in Podzol profiles under dwarf pine of different stages of degradation in subalpine zone of Karkonosze Mts (central Europe)

et al. 2017

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Purpose Here, we aimed to assess the contamination of Podzol soils in a subalpine zone of the Karkonosze Mountains. Cu, Pb, and Zn concentrations in the soil and the patterns of their speciation are discussed in relation to the possible influence of airborne industrial emissions and the stage of degradation of dwarf mountain pine stands. Materials and methods The study was conducted in the Karkonosze, a mountain range in the Sudetes, on the boundary between Poland and the Czech Republic. We examined Podzols derived from granites under dwarf mountain pine stands at two stages of degradation (without visible degradation vs. dead). These two sites were 100 m apart, at an altitude of 1400 m above sea level (upper mountain forest zone). Soil samples were collected from all distinguished soil horizons and their basic soil properties and heavy metal (Cu, Pb, and Zn) concentrations (and their speciation) determined by sequential extraction according to the method of Zeien and Brümmer. Results and discussion The Cu concentrations in these soils were relatively low, typical for soils derived from granite and did not differ considerably within soil profiles. The residual Cu fraction was a predominant one in all mineral horizons.The Pb concentrations in the surface organic horizons were clearly higher than those in similar horizons of European lowland forest soils. This distribution of Pb in the mineral horizons was apparently associated with soil colloid distribution that developed in the process of podzolization, indicating the minimum concentrations in eluvial E horizons and enhanced concentrations in illuvial Bh horizons. The organically bound fraction made up about 40% of total Pb in the Bh horizons. Zn concentrations were highest in the deepest parts of the soil, where the predominant fraction was residual, while relatively high amounts of easily mobilizable Zn were present in ectohumus.Conclusions Very high concentrations of Pb in ectohumus have most likely been caused by a long-distance transport of anthropogenic emissions. The concentrations of Pb or other metals found in soils cannot be considered to have been the principal causes of the ecological disaster observed in the Karkonosze Mountains. The highest concentrations of Pb in ectohumus, as well as its high contributions in the organically bound fraction, confirm a crucial role of organic matter in Pb accumulation in soils.

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Section: Resultssupporting

confidence: 84%

The distribution of sequentially extracted Cu, Pb, and Zn fractions in Podzol profiles under dwarf pine of different stages of degradation in subalpine zone of Karkonosze Mts (central Europe)

et al. 2017

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“…Indeed, lead mobility is generally low in reducing environments where sulphides such as galena form (PbS) (Batista et al 2013). On the contrary, Szolnoki and Farsang (2013) demonstrated that in case of anthropogenic Pb, the part of available Pb is much higher. Nonetheless, these results show that the natural origin of Pb does not prevent any accumulation by vegetables.…”

Section: Contamination Of Vegetables By Leadmentioning

confidence: 94%

Origin of trace elements in an urban garden in Nantes, France

et al. 2014

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International audienceDue to their location on old urban sites, impacted by human activities or road traffic, soils in urban gardens are often contaminated with a range of contaminants that could pose health risks. The aim of this study is to determine the origin of high trace element concentrations (arsenic and lead) in an urban community garden.Trace elements were quantified in situ in the topsoil (0–20 cm) of the 95 plots of the garden and in four soil profiles, using a portable X-ray fluorescence spectrometer. The accuracy of the spectrometer results was checked by measuring trace element concentrations by inductively coupled plasma mass spectrometry (ICP-MS) after an acid digestion (HF and HClO4). Leafy and root vegetables were sampled to assess lead transfer in vegetables. The accumulation of lead in vegetables was measured by ICP-MS after an aqua regia digestion. The bioaccessibility of lead was estimated by a calcium chloride extraction.Three anomaly levels could be defined from the mapping of arsenic and lead on the whole garden. The increase of trace elements content with depth, in correlation with pedological/geological characteristics, supports the hypothesis of a geogenic origin of these anomalies. The enrichment of the topsoil is related to the pedogenesis of soil, from micaschists as parent material. The geogenic origin of lead does not prevent its accumulation by vegetables.Although trace element anomalies have generally an anthropogenic origin, some anomalies may also have a natural (geogenic) origin, as shown in this study. The comprehension of lead origin, the mapping of its spatial distribution in the garden and the characterisation of its accumulation in vegetables were used as a basis for operational decisions including soil management. X-ray fluorescence spectrometry is a well-adapted method for this purpose. It allows an in situ and fast semiquantitative investigation on a lot of sampling points, saving time and laboratory analysis cost

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“…3). In this study, the residual phase is believed to consist mainly of primary and secondary minerals, which hold metals within their crystalline structure (Murray et al 1999;Szolnoki and Farsang 2013). The mobility and toxicity of metals are mainly dependent on metal speciation in soil.…”

Section: Geochemical Speciation Of Metals In Soilmentioning

confidence: 99%

Metal speciation in soil and health risk due to vegetables consumption in Bangladesh

Islam

Ahmed

Habibullah-Al-Mamun

2015

Environ Monit Assess

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This study was conducted to investigate the contamination level of heavy metals in soil and vegetables, chemical speciation, and their transfer to the edible part of vegetables. Metals were analyzed using inductively coupled plasma mass spectrometer (ICP-MS). The ranges of Cr, Ni, Cu, As, Cd, and Pb in agricultural soils were 3.7-41, 3.9-36, 3.7-46, 2.3-26, 0.6-13, and 4.5-32 mg/kg, respectively. The metals were predominantly associated with the residual fractions of 39, 41, 40, 40, 34, and 41 % for Cr, Ni, Cu, As, Cd, and Pb, respectively. Considering the metal transfer from soil to the edible part of vegetables, the mean transfer factors (TFs) were in the descending order of Cu > Ni > Cr > Pb > As > Cd. In the edible tissues of vegetables, the concentrations of As, Cd, and Pb in most vegetable samples exceeded the maximum permissible levels, indicating not safe for human consumption. Total target hazard quotient (THQ) of the studied metals (except Cr) from all vegetables were higher than 1, indicated that if people consume these types of vegetables in their diet, they might pose risk to these metals. Total values of carcinogenic risk (CR) were 3.2 for As and 0.15 for Pb which were higher than the US Environmental Protection Agency (USEPA) threshold level (0.000001), indicating that the inhabitants consuming these vegetables are exposed to As and Pb with a lifetime cancer risk.

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Evaluation of Metal Mobility and Bioaccessibility in Soils of Urban Vegetable Gardens Using Sequential Extraction

Cited by 46 publications

References 36 publications

The distribution of sequentially extracted Cu, Pb, and Zn fractions in Podzol profiles under dwarf pine of different stages of degradation in subalpine zone of Karkonosze Mts (central Europe)

The distribution of sequentially extracted Cu, Pb, and Zn fractions in Podzol profiles under dwarf pine of different stages of degradation in subalpine zone of Karkonosze Mts (central Europe)

Origin of trace elements in an urban garden in Nantes, France

Metal speciation in soil and health risk due to vegetables consumption in Bangladesh

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