Evaluation of plant availability of rare earth elements in soils by chemical fractionation and multiple regression analysis

Li, Fuliang; Shan, Xiao-quan; Zhang, Tianhong; Zhang, Shuzhen

doi:10.1016/s0269-7491(98)00063-3

Cited by 108 publications

(76 citation statements)

References 41 publications

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“…It also can be seen from Table 6 that the concentrations in fraction B1 have significant correlation with the root uptake. This is in good accordance with our previous findings (Li et al, 1998;Zhang and Shan, 2001). The reason for different correlationship between the shoots and roots and soil fractions may be due to the short culture period of plant.…”

Section: Comparison Of Relationship Between Speciation and Bioavailabsupporting

confidence: 93%

“…Generally, all elements accumulated in root correlated well to the concentration of trace elements in fraction B1, while no significant correlation was found between the root accumulation and extracted concentration of elements in fraction B2 and B3. This phenomenon was also reported by others (Chlopecka and Adriano, 1996;Li et al, 1998). It can be clearly seen from Table 6 that the correlation coefficients obtained with wet samples were also better than that obtained with dried samples.…”

Section: Comparison Of Relationship Between Speciation and Bioavailabsupporting

confidence: 87%

“…The trace elements in each fraction were also determined by ICP-MS. The optimal operation conditions for the determination were reported previously (Li et al, 1998).…”

Section: Determination Of Elementsmentioning

confidence: 99%

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Comparison between fractionation and bioavailability of trace elements in rhizosphere and bulk soils

2002

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Rhizosphere is a microbiosphere and has quite different chemical, physical and biological properties from bulk soils. A greenhouse experiment was performed to compare the difference of fractionation and bioavailability of trace elements Cr, Ni, Zn, Cu, Pb and Cd between rhizosphere soil and bulk soil. In the meantime, the influence of air-drying on the fractionation and bioavailability was also investigated by using wet soil sample as a control. Soils in a homemade rhizobox were divided into four zones: rhizosphere, near rhizosphere, near bulk soil and bulk soil zones, which was designated as S 1 , S 2 , S 3 and S 4 . Elemental speciations were fractionated to water soluble, exchangeable and carbonate bound (B1), Fe-Mn oxide bound (B2), and organic and sulfide bound (B3) by a sequential extraction procedure. Speciation differences were observed for elements Cr, Ni, Zn, Cu, Pb and Cd between the rhizosphere and bulk soils, and between the air-dried and wet soils as well. The concentrations of all six heavy metals in fraction B1 followed the order of S 2 > S 3 > S 1 > S 4 and for B2, the order was S 2 > S 3 % S 4 > S 1 . For B3, the order was S 1 > S 3 % S 4 > S 2 , while for Cd the order was S 2 > S 3 % S 4 > S 1 . The air-drying increased elemental concentration in fractions B1 and B2 by 20-50% and decreased in fraction B3 by about 20-100%. Correlation analysis also indicated that the bioavailability correlation coefficient of fraction B1 in rhizosphere wet soil to plants was better than that between either air-dried or nonrhizosphere soils. Therefore, application of rhizosphere wet soils should be recommended in the future study on the speciation analysis of trace elements in soils and bioavailability. Ó

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Section: Comparison Of Relationship Between Speciation and Bioavailabsupporting

confidence: 93%

Section: Comparison Of Relationship Between Speciation and Bioavailabsupporting

confidence: 87%

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Comparison between fractionation and bioavailability of trace elements in rhizosphere and bulk soils

2002

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“…Many researchers (Harmet, 1979;Hanzely and Harmet, 1982;Guo et al, 1988;Gao, 1997) reported that REEs could stimulate the growth and development of plants, especially in plant roots. The above results demonstrated that the roots of rice could accumulate a much higher REE concentration than in the germs and the resting seeds, which is consistent with the literature (Li et al, 1998). From our results we suggested that at least one reason for the REE concentration di erence between the root and stem could be attributed to the absorption ability.…”

Section: Uptake Behavior Of Ree From the Ree Fertilizer Solutionsupporting

confidence: 92%

Uptake and distribution of rare earth elements in rice seeds cultured in fertilizer solution of rare earth elements

et al. 2001

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The uptake behavior of rare earth elements (REEs) under pot conditions using deionized water and a REE fertilizer solution as the culture media as well as the distribution of REEs in rice proteins were studied. The uptake of REEs in rice seeds increased dramatically after a lag period of approximately three days. Roots can accumulate a much higher content of REEs than germs and the resting seeds. The REE content in each water-soluble (albumin) and salt-soluble (globulin) component of the rice seeds accounted for 5±8% and 4±6% of the total REEs, respectively. However, there are less than 1.5% of the total REEs were found in the alcohol-soluble (prolamin) and acetic acid-soluble (glutelin) components. The high performance liquid chromatography (HPLC) in the gel permeation and the reserved-phase were used to monitor changes in the molecular weight distribution changes of the soluble proteins of rice seeds during germination after having been cultured in the same solution for seven days. No changes occurred in the prolamin, while a slight change occurred in the albumin, globulin and glutelin. Fractionation of the albumin of rice seeds cultured in a REE fertilizer solution on the Sephadex G-100 column indicated that REEs, especially Ce, La, Pr and Nd, were associated mainly with biological compounds of a molecular weight between 10,000 and 12,000. Ó

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“…Equilibrium release experiments (Cao et al, 2001) demonstrated that the release of La, Ce, Gd and Y increased with decreasing pH or Eh. It was also reported that the release of REEs were correlated with the release of Fe and Mn, suggesting that the release of REEs originated from dissolution of Fe-Mn oxyhydroxides under the reduced and low soil pH conditions (Li et al, 1998). The adsorption of REEs increased with increasing soil pH Liu, 1992, 1993).…”

Section: Introductionmentioning

confidence: 92%

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

2002

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Evaluation of plant availability of rare earth elements in soils by chemical fractionation and multiple regression analysis

Cited by 108 publications

References 41 publications

Comparison between fractionation and bioavailability of trace elements in rhizosphere and bulk soils

Comparison between fractionation and bioavailability of trace elements in rhizosphere and bulk soils

Uptake and distribution of rare earth elements in rice seeds cultured in fertilizer solution of rare earth elements

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

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