Effect of organic acids on adsorption and desorption of rare earth elements

Shan, Xiao-quan; Lian, Jun; Wen, Bin

doi:10.1016/s0045-6535(02)00032-2

Cited by 131 publications

(55 citation statements)

References 27 publications

(29 reference statements)

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“…Generally, increased soil pH leads to the enhancement of the affinity of soils for REEs due to pH-dependent surface-charge density on colloids, resulting in the less concentration of REEs in soil solution (Cao et al, 2001;Shan et al, 2002). However, this phenomenon was not observed in our experiments.…”

Section: Discussioncontrasting

confidence: 57%

Effect of earthworms (Eisenia fetida) on the fractionation and bioavailability of rare earth elements in nine Chinese soils

Wen

Liu

et al. 2006

Chemosphere

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The effect of earthworm (Eisenia fetida) activity on soil pH, dissolved organic carbon (DOC), fraction distribution pattern and bioavailability of rare earth elements (REEs) Y, La, Ce, Pr and Nd in nine Chinese soils were investigated using pot experiments. A three-step extraction procedure recommended by the European Community (Standards, Measurements and Testing Programme) was used to fractionate REEs in soils into water soluble, exchangeable and carbonate bound (B1), Fe-and Mn-oxides bound (B2) and organic matter and sulfide bound (B3). Inoculated with earthworms, the soil pH, DOC and water-soluble rare earth elements fraction increased. A significant correlation was obtained between the increased DOC and the increased water-soluble REEs. REEs in fraction B1 increased after earthworm inoculation, while those in fraction B3 decreased. No significant differences were observed for REEs in fraction B2. The biomass and the concentrations of REEs in wheat shoots and roots increased after the treatment with earthworms. The results demonstrated that earthworm activity increased the mobility and bioavailability of REEs in soils.

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Section: Discussioncontrasting

confidence: 57%

Effect of earthworms (Eisenia fetida) on the fractionation and bioavailability of rare earth elements in nine Chinese soils

Wen

Liu

et al. 2006

Chemosphere

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“…Bioavailability of soil metals is the result of a combination effect of rootesoilemicrobe interaction occurring in the rhizosphere soil zone, in which LMWOAs are the primary factor involved in the metal adsorption by roots (Wang et al, 2004b;Han et al, 2005). For the rhizosphere-based method, complexation of metals by organic acids plays an important role in controlling metal solubility (Naidu and Harter, 1998;Cies´lin´ski et al, 1998;Shan et al, 2002;Qin et al, 2004). Rhizosphere pH can also affect the extractability of LMWOAs from two aspects.…”

Section: Preference Of the Rhizosphere-based Methods Over Other One-stmentioning

confidence: 99%

“…Furthermore, there is increasing evidence that LMWOAs play an important role in supplying metals to roots, especially in metal deficient soils, and enhancing the uptake of metals by plants (Naidu and Harter, 1998;Cies´lin´ski et al, 1998;Shan et al, 2002Shan et al, , 2003a. These studies have helped to clarify understanding of the geochemical behavior of the rhizosphere zone and the availability of metals operating at the soileroot interface.…”

Section: Introductionmentioning

confidence: 99%

A comparison of the rhizosphere-based method with DTPA, EDTA, CaCl2, and NaNO3 extraction methods for prediction of bioavailability of metals in soil to barley

Feng

Shan

Zhang

et al. 2005

Environmental Pollution

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The rhizosphere-based method is a preferred approach for evaluating bioavailability of metals in soil. AbstractA rhizosphere-based method was compared with DTPA, EDTA, CaCl 2 , and NaNO 3 extraction methods for the evaluation of bioavailability of heavy metals in soil to barley. The extractable amounts of Cr, Cu, Zn and Cd analyzed by the rhizosphere-based method correlated significantly with the metal content of barley roots. The extractable metals identified by DTPA, EDTA, CaCl 2 and NaNO 3 methods exhibited relatively poor or no correlation with the metal content of barley roots. The stepwise multiple regression equation of the rhizosphere-based method was the simplest one, as no soil properties needed to be entered, whereas the equations for the DTPA, EDTA, CaCl 2 and NaNO 3 extraction methods always require those variables. The most distinct feature of the rhizosphere-based method was that the proposed method was suitable for acidic, neutral and near alkaline soils. In contrast, the other extraction methods were restricted to soil types. In summary, the rhizosphere-based method is the most robust approach for evaluation of bioavailability of metals in soil to barley.

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“…Lower concentrations of metals were extracted with NaNO 3 than with CaCl 2 , because the monovalent cations exert weak competition with the adsorption sites on organic matter (Novozamsky et al, 1993). For rhizospherebased method, complexation of metals by organic acids plays an important role in controlling metal solubility (Cieśliń ski et al, 1998;Naidu and Harter, 1998;Shan et al, 2002;Qin et al, 2004). Metals extracted by the rhizosphere-based method correspond to the mobile fractions in soil solution (Naidu and Harter, 1998), which are responsible for the short-term available pool (Cieśliń ski et al, 1998).…”

Section: Comparison Of Extractable Metals Using Various Extraction Mementioning

confidence: 99%

“…In our previous study, LMWOAs were used to predict the bioavailability of heavy metals and rare earth elements (REEs) in soil pools to plants . In order to further understand whether the LMWOAs extraction method can be more widely used for bioavailability, we studied the effects of LMWOAs on release of REEs and heavy metals from soils (Shan et al, 2002;Qin et al, 2004). The results indicated that metals could be easily released from soils in the presence of LMWOAs.…”

Section: Introductionmentioning

confidence: 99%

Comparison of a rhizosphere-based method with other one-step extraction methods for assessing the bioavailability of soil metals to wheat

et al. 2005

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There is no method recognized as a universal approach for evaluation of bioavailability of heavy metals in soil. Based on the simulation of the rhizosphere soil conditions and integration of the combined effects of root-soil interactions as a whole, a rhizosphere-based method has been proposed. Wet fresh rhizosphere soil was extracted by lowmolecular-weight organic acids (LMWOAs) to fractionate metal fractions of soil pools, which were then correlated with the metal contents of wheat roots and shoots. The rhizosphere-based method was compared with other one-step extraction methods using DTPA, EDTA, CaCl 2 , and NaNO 3 as extractants and the first step of the Community Bureau of Reference (BCR) method. Simple correlation and stepwise multiple regression analysis were used for the comparison. Simple correlation indicated that the extractable Cu, Zn, Cr, and Cd of soils by the rhizosphere-based method were significantly correlated with the metal contents of wheat roots. For DTPA, BCR1 and EDTA methods there was a relatively poor correlation between the extractable Cu, Zn and Cd of soil and metal contents of wheat roots. Stepwise multiple regression analysis revealed that the equation of the rhizosphere-based method was the simplest one, and no soil properties variables needed to be added. In contrast, the equations of other one-step extraction methods were more complicated, and soil properties variables needed to be entered. The most distinct feature of the rhizosphere-based method was that the recommended method was suitable for acidic, neutral and near alkaline soils. However, the DTPA and EDTA extraction methods were suitable for calcareous soils only-or-only for acidic soils. The CaCl 2 , and NaNO 3 extraction methods were only suitable for exchangeable metals. In short, the rhizosphere-based method was the most robust approach for evaluation of bioavailability of heavy metals in soils to wheat.

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Effect of organic acids on adsorption and desorption of rare earth elements

Cited by 131 publications

References 27 publications

Effect of earthworms (Eisenia fetida) on the fractionation and bioavailability of rare earth elements in nine Chinese soils

Effect of earthworms (Eisenia fetida) on the fractionation and bioavailability of rare earth elements in nine Chinese soils

A comparison of the rhizosphere-based method with DTPA, EDTA, CaCl2, and NaNO3 extraction methods for prediction of bioavailability of metals in soil to barley

Comparison of a rhizosphere-based method with other one-step extraction methods for assessing the bioavailability of soil metals to wheat

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