Influence of organic acids on the transport of heavy metals in soil

Schwab, A. P.; Zhu, Dongyong; Banks, M. Katherine

doi:10.1016/j.chemosphere.2008.02.047

Cited by 124 publications

(53 citation statements)

References 24 publications

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“…It was found that citric acid could significantly reduce Cd adsorption on soils due to the formation of soluble Cd-organic complexes (Zhou et al 2003). Schwab et al (2008) found that citric acid greatly enhanced the movement of Zn and Cd in soils, but had little influence on Pb movement. And some researchers also found that citrate had the most efficiency in releasing Cd, Pb and Zn than other organic acids (Wuana et al 2010;Vesely et al 2011).…”

Section: Introductionmentioning

confidence: 99%

Interaction of organic acids and pH on multi-heavy metal extraction from alkaline and acid mine soils

Ding

Song

Feng

et al. 2013

Int. J. Environ. Sci. Technol.

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Vegetation at mining sites can produce increased heavy metal leaching by the organic acids and protons originating from root secretion and litter degradation. Batch experiments were conducted to investigate the effects of organic acids and pH on the extraction of Pb, Cd, Zn and Cu from an alkaline mine soil (sampled from a mining site of Chenzhou City, Hunan Province) and an acid mine soil (sampled from a mining site of Daxin county, Guangxi Province). The results showed that in the presence of organic acids (acetic, oxalic, malic, fumaric, tartaric and citric acids) at pH 7, the extraction of Pb, Cd, Zn and Cu from the acid mine soil was much higher than that from the alkaline mine soil, in which only citric acid with higher concentration was capable of extracting some heavy metals. Citric acid had the strongest ability in extracting heavy metals, followed by oxalic acid. Heavy metal extraction dramatically decreased with increasing pH. Moreover, at low pH, oxalic acid promoted the risk of Cu leaching; at high pH, the leaching of Pb, Zn, Cd and Cu was enhanced by both oxalic and citric acids. This indicated that those plants, which can produce substantial citric acid or oxalic acid by root secretion and litter degradation, should not be selected for the revegetation of mining sites.

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Section: Introductionmentioning

confidence: 99%

Interaction of organic acids and pH on multi-heavy metal extraction from alkaline and acid mine soils

Ding

Song

Feng

et al. 2013

Int. J. Environ. Sci. Technol.

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“…Trace elements sorb to organic matter, which could substantially influence their behavior in terrestrial and aquatic systems (Schwab et al, 2008;Hartland et al, 2011).…”

Section: Overviewmentioning

confidence: 99%

Using lead isotopes and trace element records from two contrasting Lake Tanganyika sediment cores to assess watershed – Lake exchange

Odigie

Cohen

Swarzenski

et al. 2014

Applied Geochemistry

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Editorial handling by M. Kersten a b s t r a c tLead isotopic and trace element records of two contrasting sediment cores were examined to reconstruct historic, industrial contaminant inputs to Lake Tanganyika, Africa. Observed fluxes of Co, Cu, Mn, Ni, Pb, and Zn in age-dated sediments collected from the lake varied both spatially and temporally over the past two to four centuries. The fluxes of trace elements were lower (up to 10-fold) at a mid-lake site (MC1) than at a nearshore site (LT-98-58), which is directly downstream from the Kahama and Nyasanga River watersheds and adjacent to the relatively pristine Gombe Stream National Park. Trace element fluxes at that nearshore site did not measurably change over the last two centuries (1815-1998), while the distal, mid-lake site exhibited substantial changes in the fluxes of trace elements -likely caused by changes in land use -over that period. For example, the flux of Pb increased by $300% from 1871 to 1991. That apparent accelerated weathering and detrital mobilization of lithogenic trace elements was further evidenced by (i) positive correlations (r = 0.77-0.99, p < 0.05) between the fluxes of Co, Cu, Mn, Ni, Pb, and Zn and those of iron (Fe) at both sites, (ii) positive correlations (r = 0.82-0.98, p < 0.01, n = 9) between the fluxes of elements (Al, Co, Cu, Fe, Mn, Ni, Pb, and Zn) and the mass accumulation rates at the offshore site, (iii) the low enrichment factors (EF < 5) of those trace elements, and (iv) the temporal consistencies of the isotopic composition of Pb in the sediment. These measurements indicate that accelerated weathering, rather than industrialization, accounts for most of the increases in trace element fluxes to Lake Tanganyika in spite of the development of mining and smelting operations within the lake's watershed over the past century. The data also indicate that the mid-lake site is a much more sensitive and useful recorder of environmental changes than the nearshore site. Furthermore, the lead isotopic compositions of sediment at the sites differed spatially, indicating that the Pb (and other trace elements by association) originated from different natural sources at the two locations.

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“…CA is carboxylic acid exuded by plant roots and is commonly found in the rhizosphere where organic acids have the potential to enhance metal mobility in soil profiles by reducing soil pH and forming complexes with heavy metals. The presence of organic acids may affect heavy metal desorption, solubility and mobility (Schwab et al 2008). uptake improvement, particularly for the energy plant, the sunflower.…”

Section: Zn Sequential Extraction Results Of Soilmentioning

confidence: 99%

Chelator-enhanced phytoextraction of copper and zinc by sunflower, Chinese cabbage, cattails and reeds

Yeh

Lin

et al. 2014

Int. J. Environ. Sci. Technol.

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The phytoextraction of copper and zinc assisted by the chelators such as ethylene diamine tetraacetic acid, diethylene triamino pentaacetic acid, ethylene diamine disuccinate and citric acid into sunflowers (Hh can act as effective cation exchangers. The negatively charged chelator complexes prevented binding to the cell walls of the roots and allowed complexes to enter the cells. Organic content contains fewer soil nutrients and has fewer negatively charged functional groups, such as carboxical, phenolical and hydroxyl; these adsorb negative free metal cations and reduce metal mobility, leading to less plant uptake. Regardless of different soils' varying organic content, plant propagation ability can be listed in descending order as follows: cattails [ reeds [ sunflowers [ Chinese cabbage. The mechanism of metal uptake was apoplastic transportation. Metal accumulation levels in different parts of plants are listed in descending order as follows: roots [ stems [ leaves. This is similar to the findings of most studies.

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Influence of organic acids on the transport of heavy metals in soil

Cited by 124 publications

References 24 publications

Interaction of organic acids and pH on multi-heavy metal extraction from alkaline and acid mine soils

Interaction of organic acids and pH on multi-heavy metal extraction from alkaline and acid mine soils

Using lead isotopes and trace element records from two contrasting Lake Tanganyika sediment cores to assess watershed – Lake exchange

Chelator-enhanced phytoextraction of copper and zinc by sunflower, Chinese cabbage, cattails and reeds

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