Heavy metal distribution in soil aggregates: a comparison of recent and archived aggregates from Russia

Ilg, Katrin; Wilcke, Wolfgang; Safronov, Grigorij; Lang, Friederike; Fokin, A. D.; Kaupenjohann, Martin

doi:10.1016/j.geoderma.2004.02.006

Cited by 27 publications

(6 citation statements)

References 16 publications

(24 reference statements)

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“…For the determination of the water content, field‐moist samples were dried at 105°C until they reached constant weight. To measure total acid‐soluble As, Pb, Fe, Mn, and Al the soil was digested with concentrated HNO 3 in closed vessels (two replicates), following the procedure described by Ilg et al (2004) The digested samples were filtered, transferred into volumetric flasks and filled to the volume with deionized water. This solution was analyzed as described in the analysis section.…”

Section: Methodsmentioning

confidence: 99%

Mobilization of Soluble and Dispersible Lead, Arsenic, and Antimony in a Polluted, Organic‐rich Soil – Effects of pH Increase and Counterion Valency

Klitzke

Lang

2009

J of Env Quality

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Liming is a common technique suggested for the stabilization of shooting range sites. We investigated the effect of an increase in pH on the mobilization of soluble and dispersible (colloidal) Pb, As, and Sb. Our hypothesis was that the addition of divalent cations counteracts the pH-induced mobilization of soluble and colloidal metal(loid)s. We determined soluble (operationally defined as the fraction < 10 nm obtained after centrifugation) and dispersible (filter cut-off 1200 nm) As, Pb, Sb, Fe, and C(org) concentrations in the filtered suspensions of batch extracts of topsoil samples (C(org): 8%) from a former shooting range site following a pH increase to values between 3.5 and 7 by adding a monovalent (KOH) or a divalent (Ca(OH)(2)) base. In the Ca(OH)(2)-treated samples, dissolved metal(loid) concentrations were 62 to 98% lower than those titrated with KOH to similar pH. Similarly, Ca reduced the concentration of dispersible Pb by 95%, but had little or no impact on dispersible As and Sb. We conclude that the counterion valency controls the mobility of metal(loid)s by affecting the mobility and sorption capacity of the sorbents (e.g., colloids, organic matter).

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Section: Methodsmentioning

confidence: 99%

Mobilization of Soluble and Dispersible Lead, Arsenic, and Antimony in a Polluted, Organic‐rich Soil – Effects of pH Increase and Counterion Valency

Klitzke

Lang

2009

J of Env Quality

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“…We may not rule out that the soils have been contaminated by deposition from the air and will consider the possible error in our discussion. The identity of the archived and recently collected samples at Lesnaja Dacha, Bronnitsi, and Nenashevo has been previously proven by detailed analysis of the mineralogical composition (Ilg et al, 2004). Although this early soil sampling was not designed to capture the spatial variation, we consider the opportunity to study these samples as unique because they contain important information on a climatic region, which is clearly underexplored with respect to the dynamics of persistent organic pollutants.…”

Section: Methodsmentioning

confidence: 99%

Polycyclic Aromatic Hydrocarbons (PAHs) in Soils of the Moscow Region— Concentrations, Temporal Trends, and Small‐Scale Distribution

et al. 2005

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The knowledge of the environmental fate of polycyclic aromatic hydrocarbons (PAHs) is restricted to few climatic regions of the world almost excluding the Taiga. Our objectives were to (i) separate anthropogenic from background contributions to PAH concentrations and (ii) determine temporal trends in PAH concentrations during the last century including the change in distribution of PAHs in interior and exterior portions of aggregates in soils of the Moscow region. Along a southeast-bound transect from Moscow (windward in winter) and at a background location northeast of Moscow (leeward in winter), seven topsoil samples were collected in 1910-1954 and 35 in 1998-2003. We fractionated the soils in interior and exterior portions of aggregates > 10 mm and remaining soil without aggregates. The sum of 21 PAHs (sigma21PAHs) concentrations in recent bulk soil ranged from 59 to 1350 ng g(-1). The concentrations of all PAHs were lower outside than in Moscow. The range of the concentrations of the sigma21PAHs in archived soil samples (159-1280 ng g(-1)) was similar as in recent soils. In most recent and archived samples, naphthalene and phenanthrene, were most abundant. The concentrations of low-molecular-weight PAHs decreased during the last century at most sites; those of high-molecular-weight compounds increased. The sigma21PAHs concentrations were accumulated in the exterior of aggregates (109%) and depleted in the interior (95%) relative to the concentration in bulk soil (defined as 100%), which was similar to that in the soil without aggregates (99%). The differences between aggregate interior and exterior did not change during the last century. The dominance of naphthalene and phenanthrene is typical of remote regions. The urban influence on PAH concentrations in the last century was small.

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“…For the determination of the water content, field-moist samples were dried at 105°C until they reached constant weight. To measure total acid-soluble Fe and Pb concentrations the soil was digested in closed vessels (two replicates), following the procedure described by Ilg et al (2004). Ten millilitres of concentrated nitric acid were added to 2 g of field-moist soil.…”

Section: Soil Sampling and Soil Characterizationmentioning

confidence: 99%

Increasing pH releases colloidal lead in a highly contaminated forest soil

Klitzke

Lang

Kaupenjohann

2008

European J Soil Science

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Colloids can play an important role in the leaching of lead (Pb) in soils, and liming to increase pH may produce conditions conducive to colloid release. We studied the effect of pH and the role of counterion valency on the mobilization of Pb in two topsoil horizons of a former shooting range. In batch experiments, the release of both dissolved and colloidal Pb was studied at a pH range between 3 and 7. The pH was adjusted with solutions of nitric acid (pH 3) and KOH and Ca(OH) 2 (pH 4-7) and the chemical composition, size and charge of the mobilized colloids were determined. In the presence of the monovalent K þ -ion concentrations of colloidal and dissolved Pb increased markedly with increasing pH. Colloids were stabilized not only by electrostatic but also by steric repulsion. Organic colloids seem to dominate at low pH of the KOH-treatment; at pH > 4 mineral particles were also dispersed. Even though the presence of the Ca 2þ ion reduced the concentrations of colloidal Pb more than did the K þ ion, our results of the Ca(OH) 2 treatment show that the relevance of both colloidal and dissolved Pb increases at a pH of about 5.8. Risk assessment on limed sites should therefore take into account both dissolved and colloidal Pb in judging the likelihood of Pb leaching.

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Heavy metal distribution in soil aggregates: a comparison of recent and archived aggregates from Russia

Cited by 27 publications

References 16 publications

Mobilization of Soluble and Dispersible Lead, Arsenic, and Antimony in a Polluted, Organic‐rich Soil – Effects of pH Increase and Counterion Valency

Mobilization of Soluble and Dispersible Lead, Arsenic, and Antimony in a Polluted, Organic‐rich Soil – Effects of pH Increase and Counterion Valency

Polycyclic Aromatic Hydrocarbons (PAHs) in Soils of the Moscow Region— Concentrations, Temporal Trends, and Small‐Scale Distribution

Increasing pH releases colloidal lead in a highly contaminated forest soil

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